18 · Body & interior

Seats

Make: Ford
Model: Fusion Factory Service Manual
Year: 2007
Section: 501-10 Seating › Diagnosis and testing › Seats

BodySeats

Seats

Section 501-10 · Diagnosis and testing · revised 07/31/2006

Special Tool(s)
	Fluke 73III Automotive Meter 105-R0057 or equivalent
	Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool
	Diagnostic Tool, Restraint System 418-133 (014-R1076) (2 required)

Restraint System Diagnostic Tool Warning

WARNING: These tools are for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.

Medium Speed Controller Area Network (MS-CAN)

This vehicle utilizes a communication system called a medium-speed controller area network (MS-CAN). When diagnosing the memory seat or climate controlled seat, use a Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool with the latest software update with the capability of communicating over the MS-CAN bus.

Principles of Operation

Driver and Passenger Power Seats Without Memory

The 10-way seat control feature (MKZ passenger seat only) moves the seat in 10 possible directions: the seat can be moved forward or backward and the front and back of the cushion can be moved up and down independently. The backrest of the seat can be moved forward and backward, and the lumbar can be moved IN and OUT. All 10 positions are controlled by one switch. The power seat feature operates independent of the ignition switch position.

The 6-way power seat feature moves the seat in 6 possible directions: the seat can be moved forward or backward and the front and back of the cushion can be moved up and down independently. The power seat feature operates independent of the ignition switch position.

The power seat motors are hardwired to the seat control switch. The circuits are normally at ground through the seat control switch. An individual circuit is switched to power when a specific adjustment position is selected.

Power Driver Seat With Memory

The memory driver seat feature allows the driver to program a personalized seat position that can be recalled using the memory switch or a remote keyless entry (RKE) transmitter. There are 2 memory settings possible. The outside rear view mirror positions and the power adjustable pedals (if equipped) are also stored and recalled with the power driver seat positions.

The driver power seat is controlled by the driver seat module (DSM), if equipped. A new DSM must be configured after installation. Refer to Section 418-01.

The driver seat control switch provides voltage to the DSM when activated. The NEUTRAL position of each driver seat control switch position is a ground state through the seat control switch contacts. A voltage input causes the DSM to power the appropriate motor until the input is removed. Ground is the normal state of the motor circuits through the DSM and is not switched to control the motors. The DSM internally switches the appropriate circuit from ground to power for operating the motors.

As the seat is adjusted, the DSM constantly monitors the motor position sensors to record the current seat position. The DSM will remove power from the motor upon termination of the seat control switch input or if the DSM does not see movement from the motor by monitoring the position sensor. The DSM must be calibrated to the driver seat track for correct memory seat operation. Refer to Seat Calibration in this section. Once the DSM is calibrated to the seat track, it will only allow movement within the calibrated range.

The DSM communicates diagnostic trouble code (DTC) and other information using the MS-CAN communication bus. It should be noted for diagnostics that because CAN bus communication is more robust and reliable than other methods, it may be possible to have limited module communication with one of the CAN bus circuits disconnected or shorted to ground. Refer to Section 418-00 for additional information concerning MS-CAN bus communication.

Programming Memory Seat Positions

A power driver seat position can be stored at any time. The driver must move the seat to the desired position using the driver seat control switch. The driver must then depress the memory SET switch which activates the memory SET switch light emitting diode (LED). Within 5 seconds (before the LED goes out), the driver must select a memory position. Memory 1 is selected by depressing memory switch 1. Memory 2 is selected by depressing memory switch 2.
If no memory switch input is received within the 5-second time limit, the operation is aborted and the memory SET switch LED is turned OFF. If one of the following inputs is received during the 5-second programming limit, the operation is aborted and the memory SET switch LED is turned OFF:
- Power driver seat control switch
- Memory SET switch
- Power adjustable pedal switch

Recalling a Stored Memory Seat Position

NOTE: A memory recall can be initiated only if the vehicle is in PARK or NEUTRAL gear and the ignition switch is not in START. A memory recall in progress will not be affected by moving the ignition switch to START or by moving the gearshift lever out of PARK or NEUTRAL.

Once the driver has stored the driver seat position, the driver can recall the setting by depressing the corresponding memory switch or by using a programmed remote entry transmitter.

The driver can recall the desired driver seat position by depressing one of the memory recall switches. Depressing memory switch 1 will initiate a recall of the power driver seat position stored in Memory 1. Depressing memory switch 2 will initiate a recall of the power driver seat position stored in Memory 2.

A remote entry transmitter can be used to recall previously set memory positions. The transmitter that has been assigned with personality 1 is capable of recalling memory position 1 only. Similarly, the personality 2 transmitter can recall only memory position 2.

Memory recall occurs when the unlock switch is depressed on the remote entry transmitter. The second depression of the unlock switch, which unlocks passenger doors, does not initiate a memory recall.

A memory recall in progress does not prohibit the initiation of another memory recall; the most recently requested memory recall will be executed.

Memory positions that have not been programmed will not initiate any motion for the power driver seat, power memory rear view mirrors or adjustable pedals.

Easy Exit/Easy Entry

The easy exit function moves the seat backwards about 2 inches when the ignition key is removed from the ignition switch. The DSM receives a key out command over the MS-CAN communication network and powers the driver seat rearward. This function will not operate if the seat is less than the travel distance to the end of the track or the function has been deactivated. The DSM will also cancel this operation if a valid input command is received, such as the seat control switch or memory recall request.

The DSM will record the current seat position before powering the seat for an easy exit function. This recorded position will be used to return the seat to this position on the easy entry operation. During easy entry operation, the seat is returned to the position previous to the easy exit operation. Easy entry operation will be cancelled if a valid input command is received by the DSM.

The easy exit/easy entry feature can be activated or deactivated using a scan tool or via the message center. Refer to Section 418-01 or the owner's literature.

Heated Seats

Vehicles equipped with front heated seats are equipped with a single-heated seat module to control both front heated seats. The heated seat module is located on the passenger seat track. The electronic automatic temperature control (EATC) module includes both driver and passenger heated seat control buttons and indicators. The heated seat system will function independently of the vehicle's climate control system. A momentary ground signal is transmitted to the heated seat module when a heated seat switch button on the EATC module is depressed and ignition switched voltage is supplied. Upon receiving each control signal to an input circuit, the heated seat module will decrease one setting (the sequence is HI, LOW, OFF, HI, etc.). When a heated seat is set to HI, both LED indicators above that heated seat's control button will illuminate. When a heated seat is set to LOW, only one LED indicator above that switch will illuminate. When activated, the heated seat module supplies power to the selected seat's heater circuit. Each seat's cushion heater mat and backrest heater mat is connector in a series circuit to the heated seat module and powered by the output circuit for that seat and ground. The heated seat module monitors inputs from a temperature sensor, located in each seat's cushion heater mat and maintains seat temperature by regulating current flow to the heater circuits. The heated seat module will remain ON until the heated seat switch button is depressed to cycle the heated seat module OFF or a 15-minute time-out period occurs. If ignition power is switched OFF, the heated seat module will enter an OFF state.

Climate Controlled Seat System

NOTE: When installing a new dual climate control seat module (DCSM), it is necessary to carry out programmable module installation (PMI). Refer to Section 418-01.

Both the driver and front passenger climate controlled seats are independently controlled electronically by the DCSM mounted to the bottom of the passenger seat cushion. The climate controlled seat system only operates with the engine running, however, if using a scan tool to command the DCSM, diagnostic testing can be carried out with the ignition switch key ON engine OFF (KOEO). The system receives power from battery junction box (BJB) fuse 12 (30A) feeding battery voltage on circuit SBB12 (GN/RD) into DCSM C3305a pin F. The system also receives power from BJB fuse 11 (30A) feeding battery voltage on circuit SBB11 (BU/RD) into DCSM C3305a pin E.

If only one of the BJB fuses 11 or 12 open, both seats will remain operational because the power feed circuits are internally connected in the DCSM.

Both climate controlled seats operate independently. If a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the module and the other will remain operational.

The 4 switches (identified with seat icons) on the dual-zone electronic automatic temperature control (EATC) module activate each seat system setting and illuminate LEDs above each switch to indicate the operating mode, 3 LEDs for HIGH, 2 LEDs for MED or 1 LED for LOW. The push-buttons with the blue seat icon operate the seat cooling mode and the push-buttons with the red seat icon operate the seat heating mode. The climate controlled seat system is not equipped with auto-mode.

Each driver and front passenger seat cushion is equipped with a thermo-electric device (TED) assembly that includes a seat blower (fan motor, serviced as an assembly with the TED). Similarly, each driver and front passenger seat backrest is also equipped with its own TED assembly with blower. Cabin air is drawn through the blower and distributed to each of the TED modules located in the seat cushion and backrest. The TEDs then heat or cool the air. The air is then directed into the foam pad and manifold where it is distributed along the surface of the cushion and backrest of the seat. Once the system is activated, the DCSM uses a set of flexible algorithms to control the heating/cooling modes and the blower speed dependant on the EATC seat switch settings.

The TED uses a ''Peltier'' circuit of P-type and N-type semiconductors connected in series using copper electrical conductors. The semiconductors are sandwiched between 2 copper heat exchangers. When current is applied to the TED, one side releases energy as heat, while the opposite side absorbs energy and gets cold. By reversing the current flow, the hot and cold sides reverse.

NOTE: Avoid applying power directly to a TED for testing its operation. Doing so may cause damage to the TED or shorten its usable life.

The temperature differences between the individual heated and cooled settings is minimal. For example, it is difficult to distinguish between LOW COOL and MEDIUM COOL settings. Measuring seat temperature at different settings is possible by monitoring the DCSM PIDs using the scan tool.

The EATC module communicates climate controlled seat commands to the DCSM using the medium speed controller area network (MS-CAN) communication bus. The MS-CAN bus is connected to the data link connector (DLC) for diagnostic use. No direct connection exists between the DCSM and EATC for the climate controlled seat switches. The climate controlled seats can be commanded using the diagnostic tool to verify both module communication on the MS-CAN bus and operation of the DCSM. This method may be useful for isolating a control switch concern. It should also be noted that because CAN bus communication is more robust and reliable than other methods, it may be possible to have limited module communication with one of the CAN bus circuits disconnected or shorted to ground. Refer to Section 418-00 for additional information concerning CAN bus communication.

Heating Characteristics

NOTE: The presence of overtemperature faults (DTCs B2729, B2730, B272A and B272B) can be induced by incorrect operation of the climate controlled seat system after an initial HEAT setting has been attained. If a HEAT setting is repeatedly turned OFF and ON in an attempt to increase the seat temperature, an overtemperature condition can result and the DTC(s) will be set.

In HEAT mode, the TED circuits of a given seat are wired in parallel internally in the DCSM.
The climate controlled seat system draws approximately 24 amperes, with both seats heating, until reaching the set point and then the system operates at a reduced amperage to maintain the climate setting.
In HEAT mode, the TED can add up to 40°C-60°C (72°F-108°F) to the ambient air temperature entering the system.
There are 3 manual settings based on the LEDs above each seat heat switch button on the EATC. The first setting is HIGH (3 LEDs), the second setting is MED (2 LEDs), the third is LOW (1 LED) then OFF (no LEDs).
In the LOW setting, the climate controlled seat module is set to maintain TED temperature at approximately 46°C (115°F).
In the HIGH setting, the climate controlled seat module is set to maintain TED temperature at 65°C (149°F).
If the temperature at one of the TEDs rises above 110°C (230°F) in the HEAT mode or 65°C (149°F) in the COOL mode for more than 4 seconds, the DCSM will record an overtemperature DTC, remove power from the TEDs and go into blower only mode in an attempt to cool down the TEDs. If the TEDs temperature has not dropped to 105°C (221°F) in the HEAT mode or 60°C (140°F) in the cool mode after 30 seconds, the DCSM will shut down and remain off until the ignition is cycled. Also if the DCSM detects an overtemperature twice during the same ignition cycle, it will also shut down.
When heating, the DCSM will vary the speed of the fans and the TED duty cycle in order to reach and maintain the temperature determined by the switch setting.
Seat heating has a maximum operating duration of 15 minutes.

Climate Controlled Seat Heat State	Initial Temperature	Final Temperature
HIGH	90°C (194°F)	65°C (149°F)
MED	80°C (176°F)	60°C (140°F)
LOW	75°C (167°F)	46°C (115°F)

Cooling Characteristics

In cool mode, the TED circuits of a given seat are wired in series internally in the DCSM.
The climate controlled seat system draws approximately 10 amps for the first 12 minutes and will operate at 2 amps thereafter.
In cool mode, the TED can remove up to 8°C (14°F) from the ambient air temperature entering the system.
There are 3 manual settings based on the LEDs above each seat cool switch button on the EATC. The first setting is HIGH (3 LEDs), the second setting is MED (2 LEDs) and the third is LOW (1 LED) then OFF (no LEDs).
If the temperature at one of the TEDs falls below 5°C (41°F), the climate controlled seat module will shut down the TEDs. If the temperature continues to drop below 2°C (36°F), the climate controlled seat module will shut down the blower motors.
When cooling, the DCSM maintains constant speed of the fans and constant TED supply voltage (duty cycle) in open loop cool mode.
Seat cooling has a maximum operating duration of 30 minutes.

Climate Controlled Seat Cool State	TED Voltage	TED Supply Duty Cycle
HIGH	Vbat	100%
MED	Vbat	75%
LOW	Vbat	50%

The climate controlled seat system is deactivated by one of the following actions:

Selecting the EATC module setting to manual OFF.
Turning the vehicle OFF.

Inspection and Verification

Verify the customer concern.
Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart
Mechanical	Electrical
Switch(es) Seat tracks obstructed or damaged Lumbar assembly damaged Recliner assembly damaged (backrest frame) Thermo-electric device (TED) assembly filter dirty (cushion or backrest)	BJB fuse(s): 11 (20A Fusion and Milan) (30A MKZ) (heated seats or climate controlled seats) 12 (30A) (climate controlled seats) 15 (10A) (driver memory seat) 31 (30A) (passenger power seat) 32 (30A) (driver power seat or driver memory seat) SJB fuse 28 (10A) (heated seats) Wiring harness Loose or corroded connections Seat control switch(es) Power seat motor (seat track) Memory seat position switch Seat cushion heater Seat backrest heater Heated seat module Lumbar control switch Power lumbar motor Thermo-electric device (TED) assembly (cushion or backrest) Power recliner motor Driver seat module (DSM) Driver door module (DDM) Electronic automatic temperature control (EATC) module Dual climate controlled seat module (DCSM)

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the concern is with the power seat (non-memory seat) or heated seat and the cause is not visually evident, verify the symptom and GO to Symptom Chart.
NOTE: Make sure to use the latest scan tool software release.
If the concern is with the memory seat or climate controlled seat and the cause is not visually evident, connect the scan tool to the data link connector (DLC).
NOTE: The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
If the scan tool does not communicate with the VCM:
- check the VCM connection to the vehicle.
- check the scan tool connection to the VCM.
- refer to Section 418-00, No power to the scan tool, to diagnose no communication with the scan tool.
If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- refer to Section 418-00 to diagnose no response from the powertrain control module (PCM).
Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to Section 418-00.
- If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).
Clear the continuous DTCs and carry out the self-test diagnostics for the DSM, DDM, DCSM.
If the DTCs retrieved are related to the concern, go to DSM Diagnostic Trouble Code (DTC) Index, DCSM DTC Index or DDM DTC Index. For all other DTCs, refer to Section 419-10.
If no DTCs related to the concern are retrieved, GO to Symptom Chart.

Driver Seat Module (DSM) Diagnostic Trouble Code (DTC) Index

DTC	Description	Retrieved	Action
B1317	Battery Voltage High	Continuous	REFER to Section 414-00.
B1318	Battery Voltage Low	Continuous	REFER to Section 414-00.
B1342	ECU Is Faulted	On-Demand and Continuous	INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01.
B1663	Seat Driver Front Up/Down Motor Stalled	On-Demand	If the motor does not operate, Go To Pinpoint Test J. If motor operates, Go To Pinpoint Test K.
B1664	Seat Driver Rear Up/Down Motor Stalled	On-Demand	If the motor does not operate, Go To Pinpoint Test J. If motor operates, Go To Pinpoint Test K.
B1665	Seat Driver Forward/Backward Motor Stalled	On-Demand	If the motor does not operate, Go To Pinpoint Test J. If motor operates, Go To Pinpoint Test K.
B1666	Seat Driver Recline Motor Stalled	On-Demand	If the motor does not operate, Go To Pinpoint Test J. If motor operates, Go To Pinpoint Test K.
B1667	Mirror Driver Up/Down Motor Stalled	On-Demand	REFER to Section 501-09.
B1668	Mirror Driver Right/Left Motor Stalled	On-Demand	REFER to Section 501-09.
B1669	Mirror Passenger Up/Down Motor Stalled	On-Demand	REFER to Section 501-09.
B1670	Mirror Passenger Right/Left Motor Stalled	On-Demand	REFER to Section 501-09.
B1703	Seat Driver Recline Forward Switch Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test J.
B1707	Seat Driver Recline Rearward Switch Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test J.
B1711	Seat Driver Front Up Switch Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test J.
B1715	Seat Driver Front Down Switch Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test J.
B1719	Seat Driver Forward Switch Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test J.
B1723	Seat Driver Rearward Switch Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test J.
B1727	Seat Driver Rear Up Switch Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test J.
B1731	Seat Driver Rear Down Switch Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test J.
B1952	Seat Rear Up/Down Position Feedback Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test K.
B1953	Seat Rear Up/Down Position Feedback Circuit Short to Ground	On-Demand and Continuous	Go To Pinpoint Test K.
B1956	Seat Front Up/Down Position Feedback Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test K.
B1957	Seat Front Up/Down Position Feedback Circuit Short to Ground	On-Demand and Continuous	Go To Pinpoint Test K.
B1960	Seat Recline Forward/Backward Position Feedback Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test K.
B1961	Seat Recline Forward/Backward Position Feedback Circuit Short to Ground	On-Demand and Continuous	Go To Pinpoint Test K.
B1964	Seat Horizontal Forward/Rearward Position Feedback Circuit Short to Battery	On-Demand and Continuous	Go To Pinpoint Test K.
B1965	Seat Horizontal Forward/Rearward Position Feedback Circuit Short to Ground	On-Demand and Continuous	Go To Pinpoint Test K.
B2143	Non Volatile Memory Failure (EEPROM)	Continuous	CALIBRATE the DSM. REFER to Section 418-01. CLEAR the DTCs. REPEAT the self-test. If the DTC resets, INSTALL a new DSM and CARRY OUT programmable module installation (PMI). REFER to Section 419-10.
B2223	Mirror Driver Drive Circuit Failure	On-Demand and Continuous	REFER to Section 501-09.
B2224	Mirror Passenger Drive Circuit Failure	On-Demand and Continuous	REFER to Section 501-09.
B2312	Mirror Passenger Horizontal Feedback Potentiometer Circuit Failure	On-Demand and Continuous	REFER to Section 501-09.
B2314	Mirror Passenger Horizontal Feedback Potentiometer Circuit Short to Battery	On-Demand and Continuous	REFER to Section 501-09.
B2316	Mirror Passenger Vertical Feedback Potentiometer Circuit Failure	On-Demand and Continuous	REFER to Section 501-09.
B2318	Mirror Passenger Vertical Feedback Potentiometer Circuit Short to Battery	On-Demand and Continuous	REFER to Section 501-09.
B2477	Module Configuration Failure	Continuous	CARRY OUT programmable module installation (PMI) on the DSM. CLEAR the DTC. If the DTC does not clear, CARRY OUT PMI on the DSM once again. CLEAR the DTC. If the DTC does not CLEAR, INSTALL a new DSM and CARRY OUT PMI on the new DSM. REFER to Section 419-10. CLEAR the DTC. CARRY OUT the self-test.
U1900	CAN Communication Bus Fault — Receive Error	On-Demand and Continuous	NOTE: Do not install a new DSM as part of repair for a DSM DTC U1900 fault. The DSM is not the source of the fault when DTC U1900 is present. If DTC U1900 is present on-demand, CHECK the instrument cluster module for DTCs and REPAIR as needed. REFER to Section 413-01. If DTC U1900 is present continuous only, CHECK for an intermittent MS-CAN fault. REFER to Section 418-00 to diagnose the MS-CAN network concern.
U2050	No Application Code Present	On-Demand and Continuous	CALIBRATE the DSM. REFER to Section 418-01. CLEAR the DTC. REPEAT the self-test. If the DTC does not clear or is retrieved again, INSTALL a new DSM and CARRY OUT programmable module installation (PMI). REFER to Section 419-10.

Driver Door Module (DDM) Diagnostic Trouble Code (DTC) Index

NOTE: Only the memory set switch DTCs are listed. For all DDM DTCs, refer to Section 419-10.

DTC	Description	Retrieved	Action
B1530	Memory Set Switch Circuit Short to Ground	On-Demand and Continuous	REFER to Section 501-09.
B1534	Memory 1 Switch Circuit Short to Ground	On-Demand and Continuous	REFER to Section 501-09.
B1538	Memory 2 Switch Circuit Short to Ground	On-Demand and Continuous	REFER to Section 501-09.
B2084	Memory SET Indicator Short to Ground	On-Demand and Continuous	REFER to Section 501-09.

Dual Climate Controlled Seat Module (DCSM) Diagnostic Trouble Code (DTC) Index

DTC	Description	Retrieved	Action
B103B	Thermoelectric Driver Overcurrent Low	On-Demand and Continuous	Go To Pinpoint Test S.
B103C	Thermoelectric Driver Open Load	On-Demand and Continuous	Go To Pinpoint Test T.
B103D	Blower Driver Overtemperature	On-Demand and Continuous	Go To Pinpoint Test U.
B1111	Driver Thermoelectric Device Control Overtemperature Fault	On-Demand and Continuous	Go To Pinpoint Test S.
B1113	Passenger Thermoelectric Device Control Overtemperature Fault	On-Demand and Continuous	Go To Pinpoint Test V.
B111B	Passenger Thermoelectric Driver Overcurrent Low	On-Demand and Continuous	Go To Pinpoint Test V.
B111C	Passenger Thermoelectric Driver Open Load	On-Demand and Continuous	Go To Pinpoint Test W.
B111D	Passenger Blower Driver Overtemperature	On-Demand and Continuous	Go To Pinpoint Test X.
B1342	ECU is Faulted	On-Demand and Continuous	CLEAR the DTC. CARRY OUT the self-test. If the DTC does not clear or is retrieved again, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module.
B19A1	Passenger Seat Cushion Blower Speed Short to Battery	On-Demand and Continuous	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. CONNECT the battery ground cable. DISCONNECT DCSM C3305c and passenger cushion TED C3303. With the ignition switch ON, MEASURE the voltage between C3305c-3, circuit VHS23 (BN/BU), harness side and ground. REPAIR the short to voltage as needed. If OK, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test. For vehicles equipped with seat side air bag modules, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
B19A2	Passenger Seat Back Blower Speed Short to Battery	On-Demand and Continuous	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. CONNECT the battery ground cable. DISCONNECT DCSM C3305c and passenger cushion TED C3303. With the ignition switch ON, MEASURE the voltage between C3305c-4, circuit VHS21 (BU/WH), harness side and ground. REPAIR the short to voltage as needed. If OK, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test. For vehicles equipped with seat side air bag modules, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
B19A3	Driver Seat Cushion Blower Speed Short to Battery	On-Demand and Continuous	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. DISCONNECT driver seat side air bag module C327. CONNECT restraint system diagnostic tool 418-133 to driver seat side air bag module C327. CONNECT the battery ground cable. DISCONNECT DCSM C3305c and passenger cushion TED C3303. With the ignition switch ON, MEASURE the voltage between C3305c-11, circuit VHS18 (BN/GN), harness side and ground. REPAIR the short to voltage as needed. If OK, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test. For vehicles equipped with seat side air bag modules, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
B19A4	Driver Seat Back Blower Speed Short to Battery	On-Demand and Continuous	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. DISCONNECT driver seat side air bag module C327. CONNECT restraint system diagnostic tool 418-133 to driver seat side air bag module C327. CONNECT the battery ground cable. DISCONNECT DCSM C3305c and passenger cushion TED C3303. With the ignition switch ON, MEASURE the voltage between C3305c-12, circuit VHS16 (BU/GN), harness side and ground. REPAIR the short to voltage as needed. If OK, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test. For vehicles equipped with seat side air bag modules, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
B19A5	Passenger Seat Cushion Blower Speed Short to Ground	On-Demand and Continuous	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. CONNECT the battery ground cable. DISCONNECT DCSM C3305c and passenger cushion TED C3303. MEASURE the resistance between C3305c-3, circuit VHS23 (BN/BU), harness side and ground. REPAIR the short to voltage as needed. If OK, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test. For vehicles equipped with seat side air bag modules, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
B19A6	Passenger Seat Back Blower Speed Short to Ground	On-Demand and Continuous	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. CONNECT the battery ground cable. DISCONNECT DCSM C3305c and passenger cushion TED C3303. MEASURE the resistance between C3305c-4, circuit VHS21 (BU/WH), harness side and ground. REPAIR the short to voltage as needed. If OK, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test. For vehicles equipped with seat side air bag modules, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
B19A7	Driver Seat Cushion Blower Speed Short to Ground	On-Demand and Continuous	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. DISCONNECT driver seat side air bag module C327. CONNECT restraint system diagnostic tool 418-133 to driver seat side air bag module C327. CONNECT the battery ground cable. DISCONNECT DCSM C3305c and passenger cushion TED C3303. MEASURE the resistance between C3305c-11, circuit VHS18 (BN/GN), harness side and ground. REPAIR the short to voltage as needed. If OK, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test. For vehicles equipped with seat side air bag modules, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
B19A8	Driver Seat Back Blower Speed Short to Ground	On-Demand and Continuous	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. DISCONNECT driver seat side air bag module C327. CONNECT restraint system diagnostic tool 418-133 to driver seat side air bag module C327. CONNECT the battery ground cable. DISCONNECT DCSM C3305c and passenger cushion TED C3303. MEASURE the resistance between C3305c-12, circuit VHS16 (BU/GN), harness side and ground. REPAIR the short to voltage as needed. If OK, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test. For vehicles equipped with seat side air bag modules, DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
B2477	Module Configuration Failure	On-Demand and Continuous	CARRY OUT programmable module installation (PMI) on the DSM. CLEAR the DTC. If the DTC does not clear, CARRY OUT PMI on the DSM once again. CLEAR the DTC. If the DTC does not CLEAR, INSTALL a new DSM and CARRY OUT PMI on the new DSM. REFER to Climate Controlled Seat Module. CLEAR the DTC. CARRY OUT the self-test.
B2486	Climate Control Seat Module Voltage Out of Range	On-Demand and Continuous	REFER to Section 414-00 to diagnose the charging system concern.
B2729	Cushion Over-Temp Detected (Driver)	On-Demand and Continuous	Go To Pinpoint Test Y.
B272A	Passenger Cushion Over-Temp Detected	On-Demand and Continuous	Go To Pinpoint Test Z.
B272B	Passenger Back Over-Temp Detected	On-Demand and Continuous	Go To Pinpoint Test AA.
B272C	Driver Differential Temperature Fault	On-Demand and Continuous	Go To Pinpoint Test AB.
B272D	Passenger Differential Temperature Fault	On-Demand and Continuous	Go To Pinpoint Test AC.
B2730	Back Over-Temp Detected (Driver)	On-Demand and Continuous	Go To Pinpoint Test AD.
U2050	No Application Present	—	CALIBRATE with the latest operational software. REFER to Section 418-01. CLEAR the DTC. CARRY OUT the DCSM self-test. If the DTC does not clear, or is retrieved from the self-test, CALIBRATE with the latest operational software again. CLEAR the DTC. REPEAT the self-test. If the DTC does not clear, or is again retrieved from the self-test, INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module.

Symptom Chart

Symptom Chart
Condition	Possible Sources	Action
No communication with the driver seat module (DSM)	Fuse Circuitry DSM	For vehicles equipped with seat side air bags, DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT driver seat side air bag C327 and CONNECT restraint system diagnostic tool 418-133 to driver seat side air bag C327. CONNECT the battery ground cable. CHECK DSM C3299a pin 2, circuit SBB32 (VT/RD) and C3299c pin 1, circuit SBB15 (WH/RD) for greater than 10 volts; REPAIR as needed. CHECK DSM C3299a pin 1, circuit GD126 (BK/WH) and C3299c pin 13, circuit GD126 (BK/WH) for less than 5 ohms to ground; REPAIR as needed. If OK, REFER to Section 418-00. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
No communication with the module — unable to carry out on-demand self test with the DSM	Circuitry DSM	REFER to Section 418-00.
No communication with the dual climate control seat module (DCSM)	Fuse Circuitry DCSM	DEPOWER the supplemental restraint system (SRS). REFER to Section 501-20B. DISCONNECT passenger seat side air bag module C313. CONNECT restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. CONNECT the battery ground cable. DISCONNECT and CHECK DCSM C3305a-E, circuit SBB11 (BU/RD), harness side and DCSM C3305a-F, circuit SBB12 (GN/RD), harness side for greater than 10 volts and DCSM C3305a-M, circuit GD139 (BK/YE), harness side for less than 5 ohms to ground and REPAIR as needed. If OK, REFER to Section 418-00 to diagnose the MS-CAN communication bus concern. Once the repair is complete, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT the passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
The power seat is inoperative — driver, with power recliner	Fuse Circuitry Front seat control switch	Go To Pinpoint Test A.
The power seat is inoperative — driver, without power recliner	Fuse Circuitry Front seat control switch	Go To Pinpoint Test B.
The power seat is inoperative — passenger	Fuse Circuitry Front seat control switch	Go To Pinpoint Test C.
The power seat moves but is loose	Fastening hardware Seat track	Go To Pinpoint Test D.
The power seat moves but is noisy	Seat track	Go To Pinpoint Test E.
The power seat does not make full travel	Seat track obstructed Seat track	Go To Pinpoint Test F.
The power seat does not move horizontally/vertically/recline — driver	Circuitry Front seat motors Front seat control switch	Go To Pinpoint Test G.
The power seat does not move horizontally/vertically — driver	Circuitry Front seat motors Front seat control switch	Go To Pinpoint Test H.
The power seat does not move horizontally/vertically/recline — passenger	Circuitry Front seat motors Front seat control switch	Go To Pinpoint Test I.
The memory seat is inoperative	Circuitry Seat control switch DSM	Go To Pinpoint Test J.
The memory seat does not operate correctly — does not operate using the memory set switch	Circuitry Memory set switch DSM	Go To Pinpoint Test K.
The memory seat does not operate correctly — the seat moves in one second intervals	Circuitry DSM	REFER to the DTC Index.
The memory seat does not operate correctly — the seat does not move to the correct memory position	Circuitry Memory set switch DSM Seat track	REFER to the DTC Index.
The memory seat does not operate correctly — does not operate using the remote transmitter	Circuitry DSM Keyless entry transmitter	REFER to the DTC Index.
Easy exit/easy entry is inoperative/does not operate correctly	Circuitry Key in ignition switch ICM DSM.	Go To Pinpoint Test L.
The power lumbar is inoperative — driver	Circuitry Seat control switch Power lumbar motor assembly	Go To Pinpoint Test M.
The power lumbar is inoperative — passenger	Circuitry Seat control switch Power lumbar motor assembly	Go To Pinpoint Test N.
The heated seat is inoperative — driver	Fuse Circuitry Heated seat switch Seat cushion heater mat Seat backrest heater mat Heated seat module	Go To Pinpoint Test O.
The heated seat is inoperative — passenger	Fuse Circuitry Heated seat switch Seat cushion heater mat Seat backrest heater mat Heated seat module	Go To Pinpoint Test P.
The heated seat is inoperative — driver seat does heat but the heated seat indicator does not illuminate when pressed	Wiring, terminals or connectors EATC module Heated seat module	Go To Pinpoint Test Q.
The heated seat is inoperative — passenger seat does heat but the heated seat indicator does not illuminate when pressed	Wiring, terminals or connectors EATC module Heated seat module	Go To Pinpoint Test R.
A single climate controlled seat is inoperative/does not operate correctly	Circuitry MS-CAN network communication fault EATC module DCSM	NOTE: If a fault occurs setting a DTC specific to only one climate controlled seat, the DCSM will disable only the affected seat outputs and allow the other seat to remain operational. CHECK for DTCs specific to the affected climate controlled seat and, if a DTC is present, REFER to the Dual Climate Controlled Seat Module (DCSM) Diagnostic Trouble Code (DTC) Index. NOTE: The DCSM receives battery voltage to C3305a pins E and F. Pin F is used by the module for driver seat system operation and pin E is used for the passenger seat system operation. It may be possible for voltage to be missing from one pin location and cause only one climate controlled seat to become inoperative. Go To Pinpoint Test AE.

Pinpoint Tests

CAUTION: Electronic modules are sensitive to electrostatic discharge. If exposed to these charges, damage can result.

Refer to Inspection and Verification, the Diagnostic Trouble Code (DTC) Index and the Symptom Chart for direction to the appropriate Pinpoint Test.

Pinpoint Test A: The Power Seat Is Inoperative — Driver, With Power Recliner

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The driver seat control switch is powered by battery voltage on circuit SBB32 (VT/RD) and is supplied ground on circuit GD126 (BK/WH). When pressed, the seat control switch supplies that voltage and ground to a power seat track motor or power recline motor to move the seat or backrest. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor or power recline motor, which moves the seat or backrest in the opposite direction. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). There is an additional motor in the power recline mechanism to move the seat backrest forward and rearward. If a new seat track motor needs to be installed, it is necessary to install an entire power seat track. The power recline motor is serviced separately.

Possible Causes

An inoperative driver power seat can be caused by:

a fuse.
wiring, terminals or connectors.
a faulty seat control switch.

PINPOINT TEST A: THE POWER SEAT IS INOPERATIVE — DRIVER, WITH POWER RECLINER

Test Step	Result / Action to Take
A1 CHECK CIRCUIT SBB32 (VT/GN) FOR VOLTAGE
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag C327. Connect restraint system diagnostic tool 418-133 to the driver seat side air bag C327. Connect the battery ground cable. Disconnect: Driver Seat Control Switch C360. Measure the voltage between driver seat control switch C360-5, circuit SBB32 (VT/RD), harness side and ground. Is the voltage greater than 10 volts?	Yes GO to A2. No VERIFY battery junction box (BJB) fuse 32 (30A) is OK. If BJB fuse 32 (30A) is OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
A2 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
Measure the resistance between driver seat control switch C360-3, circuit GD126 (BK/WH), harness side and ground. Is the resistance less than 5 ohms?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test B: The Power Seat Is Inoperative — Driver, Without Power Recliner

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The driver seat control switch is powered by battery voltage on circuit SBB32 (VT/RD) and is supplied ground on circuit GD126 (BK/WH). When pressed, the seat control switch supplies that voltage and ground to a power seat track motor to move the seat. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor, which moves the seat in the opposite direction. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). If a new seat track motor needs to be installed, it is necessary to install an entire power seat track.

Possible Causes

An inoperative driver power seat can be caused by:

a fuse.
wiring, terminals or connectors.
a faulty seat control switch.

PINPOINT TEST B: THE POWER SEAT IS INOPERATIVE — DRIVER, WITHOUT POWER RECLINER

Test Step	Result / Action to Take
B1 CHECK CIRCUIT SBB32 (VT/RD) FOR VOLTAGE
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag C327. Connect restraint system diagnostic tool 418-133 to the driver seat side air bag C327. Connect the battery ground cable. Disconnect: Driver Seat Control Switch C369. Measure the voltage between driver seat control switch C369-4, circuit SBB32 (VT/RD), harness side and ground. Is the voltage greater than 10 volts?	Yes GO to B2. No VERIFY battery junction box (BJB) fuse 32 (30A) is OK. If BJB fuse 32 (30A) is OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
B2 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
Measure the resistance between driver seat control switch C369-2, circuit GD126 (BK/WH), harness side and ground. Is the resistance less than 5 ohms?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test C: The Power Seat Is Inoperative — Passenger

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The passenger seat control switch is powered by battery voltage on circuit SBB31 (WH/RD) and is supplied ground on circuit GD139 (BK/YE). When pressed, the seat control switch supplies that voltage and ground to a power seat track motor to move the seat. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor, which moves the seat in the opposite direction. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). If a new seat track motor needs to be installed, it is necessary to install an entire power seat track.

Possible Causes

An inoperative passenger power seat can be caused by:

a fuse.
wiring, terminals or connectors.
a faulty seat control switch.

PINPOINT TEST C: THE POWER SEAT IS INOPERATIVE — PASSENGER

Test Step	Result / Action to Take
C1 CHECK CIRCUIT SBB31 (WH/RD) FOR VOLTAGE
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the passenger seat side air bag C313. Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313. Connect the battery ground cable. Disconnect: Passenger Seat Control Switch C3190. Measure the voltage between passenger seat control switch C3190-5, circuit SBB31 (WH/RD), harness side and ground. Is the voltage greater than 10 volts?	Yes GO to C2. No VERIFY battery junction box (BJB) fuse 31 (30A) is OK. If BJB fuse 31 (30A) is OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
C2 CHECK CIRCUIT GD139 (BK/YE) FOR AN OPEN
Measure the resistance between passenger seat control switch C3190-3, circuit GD139 (BK/YE), harness side and ground. Is the resistance less than 5 ohms?	Yes INSTALL a new passenger seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test D: The Power Seat Moves But Is Loose

Normal Operation

The power seat movement should be smooth and the seat cushion should not rock during or after operation.

Possible Causes

A loose power seat can be caused by:

loose fastening hardware.
a faulty seat track component.

PINPOINT TEST D: THE POWER SEAT MOVES BUT IS LOOSE

Test Step	Result / Action to Take
D1 CHECK THE FASTENING HARDWARE
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the affected seat side air bag C327 (driver) or C313 (passenger). Connect restraint system diagnostic tool 418-133 to the affected seat side air bag C327 (driver) or C313 (passenger). Connect the battery ground cable. Is the fastening hardware loose?	Yes TIGHTEN all fastening hardware to specification. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B. No IDENTIFY the cause and INSTALL a new seat track component. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

Test Step

Result / Action to Take

D1 CHECK THE FASTENING HARDWARE

WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the affected seat side air bag C327 (driver) or C313 (passenger).

Connect restraint system diagnostic tool 418-133 to the affected seat side air bag C327 (driver) or C313 (passenger).

Connect the battery ground cable.

Is the fastening hardware loose?

Yes
TIGHTEN all fastening hardware to specification. TEST the system for normal operation.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

No
IDENTIFY the cause and INSTALL a new seat track component. TEST the system for normal operation.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test E: The Power Seat Moves But Is Noisy

Normal Operation

The power seat should move quietly during operation. Some noise is acceptable.

Possible Causes

A noisy power seat can be caused by:

a misaligned seat track.
a faulty seat track component.
an object obstructing seat movement.

PINPOINT TEST E: THE POWER SEAT MOVES BUT IS NOISY

Test Step	Result / Action to Take
E1 CHECK THE TRACK ALIGNMENT
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the affected seat side air bag C327 (driver) or C313 (passenger). Connect restraint system diagnostic tool 418-133 to the affected seat side air bag C327 (driver) or C313 (passenger). Connect the battery ground cable. Check the alignment of the track to the floor and the track to the seat. Is the track out of alignment?	Yes ALIGN the track to the seat and the floor. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B. No INSTALL a new seat track part. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

Test Step

Result / Action to Take

E1 CHECK THE TRACK ALIGNMENT

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the affected seat side air bag C327 (driver) or C313 (passenger).

Connect restraint system diagnostic tool 418-133 to the affected seat side air bag C327 (driver) or C313 (passenger).

Connect the battery ground cable.

Check the alignment of the track to the floor and the track to the seat.
Is the track out of alignment?

Yes
ALIGN the track to the seat and the floor. TEST the system for normal operation.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new seat track part. TEST the system for normal operation.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test F: The Power Seat Does Not Make Full Travel

Normal Operation

The power seat should travel fully horizontal (forward/rearward) and vertical (front up/down and rear up/down).

Possible Causes

A power seat that does not make full travel can be caused by:

an obstruction.
a faulty seat track component.

PINPOINT TEST F: THE POWER SEAT DOES NOT MAKE FULL TRAVEL

Test Step	Result / Action to Take
F1 CHECK FOR AN OBSTRUCTION IN THE SEAT TRACK
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the affected seat side air bag C327 (driver) or C313 (passenger). Connect restraint system diagnostic tool 418-133 to the affected seat side air bag C327 (driver) or C313 (passenger). Connect the battery ground cable. Remove the affected seat. Refer to Seat — Front in this section. Are there any obstructions in the track?	Yes REMOVE the obstruction(s) and GREASE the track(s). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B. No IDENTIFY the cause and INSTALL a new seat track component. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

Test Step

Result / Action to Take

F1 CHECK FOR AN OBSTRUCTION IN THE SEAT TRACK

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the affected seat side air bag C327 (driver) or C313 (passenger).

Connect restraint system diagnostic tool 418-133 to the affected seat side air bag C327 (driver) or C313 (passenger).

Connect the battery ground cable.

Remove the affected seat. Refer to Seat — Front in this section.
Are there any obstructions in the track?

Yes
REMOVE the obstruction(s) and GREASE the track(s). TEST the system for normal operation.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

No
IDENTIFY the cause and INSTALL a new seat track component. TEST the system for normal operation.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from seat side air bag module C327 (driver) or C313 (passenger) and CONNECT seat side air bag module C327 (driver) or C313 (passenger). REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test G: The Power Seat Does Not Move Horizontally/Vertically/Recline — Driver

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

Possible Causes

A driver power seat that does not move horizontally and/or vertically can be caused by:

wiring, terminals or connectors.
a faulty seat control switch.
a faulty seat track motor (seat track).
a faulty power recliner mechanism.

PINPOINT TEST G: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY/RECLINE — DRIVER

Test Step	Result / Action to Take
G1 CHECK THE HORIZONTAL DIRECTION MOTOR FOR CORRECT OPERATION
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag C327. Connect restraint system diagnostic tool 418-133 to the driver seat side air bag C327. Connect the battery ground cable. Operate the driver power seat forward and rearward. Will the seat move horizontally?	Yes GO to G2. No GO to G3.
G2 CHECK THE RECLINER MOTOR FOR CORRECT OPERATION
Recline the driver backrest forward and rearward. Will the seat backrest recline forward and rearward?	Yes GO to G6. No GO to G13.
G3 CHECK THE VOLTAGE TO THE DRIVER SEAT HORIZONTAL MOTOR
Disconnect: Driver Seat Motor C357. Measure the voltage between driver seat motor C357-6, circuit CPS28 (GN), harness side and C357-3, circuit CPS23 (GN/VT), harness side, while pushing the driver seat control switch forward and rearward. Is the voltage greater than -10 volts when the switch is pushed forward, greater than +10 volts when the switch is pushed rearward and 0 volt when the switch is in a rest position?	Yes INSTALL a new driver seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to G4.
G4 CHECK CIRCUIT CPS28 (GN) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Driver Seat Control Switch C360. Measure the resistance between driver seat control switch C360-9, circuit CPS28 (GN), harness side and driver seat motor C357-6, circuit CPS28 (GN), harness side; and between driver seat control switch C360-9, circuit CPS28 (GN), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes GO to G5. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
G5 CHECK CIRCUIT CPS23 (GN/VT) FOR AN OPEN AND SHORT TO GROUND
Measure the resistance between driver seat control switch C360-4, circuit CPS23 (GN/VT), harness side and driver seat motor C357-3, circuit CPS23 (GN/VT), harness side; and between driver seat control switch C360-4, circuit CPS23 (GN/VT), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
G6 DETERMINE THE SEAT TILTING FAILURE
Determine the seat tilting failure. Can the seat be tilted forward or backward?	Yes If only forward tilting operates, GO to G7 . If only rear tilting operates, GO to G10 . No INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
G7 CHECK THE VOLTAGE TO THE DRIVER SEAT REAR HEIGHT MOTOR
Disconnect: Driver Seat Motor C357. Measure the voltage between driver seat motor C357-1, circuit CPS27 (BU/BN), harness side and C357-4, circuit CPS26 (YE/BU), harness side, while depressing the rear tilt switch up and down. Is the voltage greater than -10 volts when the rear tilt switch is pressed down, greater than +10 volts when the rear tilt switch is pressed up and 0 volt when the switch is in the rest position?	Yes INSTALL a new driver seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to G8.
G8 CHECK CIRCUIT CPS27 (BU/BN) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Driver Seat Control Switch C360. Measure the resistance between driver seat control switch C360-1, circuit CPS27 (BU/BN), harness side and driver seat motor C357-1, circuit CPS27 (BU/BN), harness side; and between driver seat control switch C360-1, circuit CPS27 (BU/BN), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes GO to G9. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
G9 CHECK CIRCUIT CPS26 (YE/BU) FOR AN OPEN AND SHORT TO GROUND
Measure the resistance between driver seat control switch C360-12, circuit CPS26 (YE/BU), harness side and driver seat motor C357-4, circuit CPS26 (YE/BU), harness side; and between driver seat control switch C360-12, circuit CPS26 (YE/BU), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
G10 CHECK THE VOLTAGE TO DRIVER SEAT FRONT HEIGHT MOTOR
Disconnect: Driver Seat Motor C357. Measure the voltage between driver seat motor C357-2, circuit CPS25 (WH/VT), harness side and C357-5, circuit CPS24 (GY), while pushing the rear tilting switch up and down. Is the voltage greater than -10 volts when the front tilt switch is pressed down, greater than +10 volts when the front tilt switch is pressed up and 0 volt when the switch is in the rest position?	Yes INSTALL a new driver seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to G11.
G11 CHECK CIRCUIT CPS25 (WH/VT) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Driver Seat Control Switch C360. Measure the resistance between driver seat control switch C360-2, circuit CPS25 (WH/VT), harness side and driver seat motor C357-2, circuit CPS25 (WH/VT), harness side; and between driver seat control switch C360-2, circuit CPS25 (WH/VT), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes GO to G12. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
G12 CHECK CIRCUIT CPS24 (GY) FOR AN OPEN
Measure the resistance between driver seat control switch C360-6, circuit CPS24 (GY) harness side, and driver seat motor C357-5, circuit CPS24 (GY), harness side; and between driver seat control switch C360-6, circuit CPS24 (GY), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
G13 CHECK VOLTAGE TO THE DRIVER SEAT RECLINER MOTOR
Disconnect: Driver Seat Recliner Motor C3187. Measure the voltage between driver seat recliner motor C3187-1, circuit CPS29 (WH/BN), harness side and C3187-5, circuit CPS30 (VT/BN), while pushing the recline switch forward and rearward. Is the voltage greater than +10 volts when the switch is pushed forward, greater than -10 volts when the switch is pushed rearward and 0 volt when the switch is in a rest position?	Yes INSTALL a new driver seat recliner motor. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to G14.
G14 CHECK CIRCUIT CPS29 (WH/BN) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Driver Seat Control Switch C360. Measure the resistance between driver seat control switch C360-11, circuit CPS29 (WH/BN), harness side and driver seat recliner motor C3187-1, circuit CPS29 (WH/BN), harness side; and between driver seat control switch C360-11, circuit CPS29 (WH/BN), harness side and ground. Is the resistance less than 5 ohms between the driver seat recliner motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes GO to G15. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
G15 CHECK CIRCUIT CPS30 (VT/BN) FOR AN OPEN AND SHORT TO GROUND
Measure the resistance between driver seat control switch C352-8, circuit CPS30 (VT/BN) harness side, and driver seat recliner motor C3187-5, circuit CPS30 (VT/BN), harness side; and between driver seat control switch C352-8, circuit CPS30 (VT/BN), harness side and ground. Is the resistance less than 5 ohms between the driver seat recliner motor and the driver seat control switch; and greater than 10,000 ohms between the seat control switch and ground?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test H: The Power Seat Does Not Move Horizontally/Vertically — Driver

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The driver seat control switch is powered by battery voltage on circuit SBB32 (VT/RD) and is supplied ground on circuit GD126 (BK/WH). When pressed, the seat control switch supplies that voltage and ground to a power seat track motor to move the seat. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor, which moves the seat in the opposite direction. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). If a new motor needs to be installed, it is necessary to install an entire power seat track.

Possible Causes

A driver power seat that does not move horizontally and/or vertically can be caused by:

wiring, terminals or connectors.
a faulty seat control switch.
a faulty seat track motor (seat track).

PINPOINT TEST H: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY — DRIVER

Test Step	Result / Action to Take
H1 CHECK HORIZONTAL DIRECTION MOTOR FOR CORRECT OPERATION
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag C327. Connect restraint system diagnostic tool 418-133 to the driver seat side air bag C327. Connect the battery ground cable. Operate the driver power seat forward and rearward. Will the seat move horizontally?	Yes GO to H5. No GO to H2.
H2 CHECK VOLTAGE TO THE DRIVER SEAT HORIZONTAL MOTOR
Disconnect: Driver Seat Motor C357. Measure the voltage between driver seat motor C357-6, circuit CPS23 (GN/VT), harness side and C357-3, circuit CPS22 (BN), harness side, while pushing the driver seat control switch forward and rearward. Is the voltage greater than -10 volts when the switch is pushed forward, greater than +10 volts when the switch is pushed rearward and 0 volt when the switch is in a rest position?	Yes INSTALL a new driver seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to H3.
H3 CHECK CIRCUIT CPS22 (BN) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Driver Seat Control Switch C369. Measure the resistance between driver seat control switch C369-6, circuit CPS22 (BN), harness side and driver seat motor C357-3, circuit CPS22 (BN), harness side; and between driver seat control switch C369-6, circuit CPS22 (BN), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes GO to H4. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
H4 CHECK CIRCUIT CPS23 (GN/VT) FOR AN OPEN AND SHORT TO GROUND
Measure the resistance between driver seat control switch C369-3, circuit CPS23 (GN/VT), harness side and driver seat motor C357-6, circuit CPS23 (GN/VT), harness side; and between driver seat control switch C369-3, circuit CPS23 (GN/VT), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
H5 DETERMINE SEAT TILTING FAILURE
Determine seat tilting failure. Can the seat be tilted forward or backward?	Yes If only forward tilting operates, GO to H6 . If only rear tilting operates, GO to H9 . No INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
H6 CHECK VOLTAGE TO THE DRIVER SEAT REAR HEIGHT MOTOR
Disconnect: Driver Seat Motor C357. Measure the voltage between driver seat motor C357-1, circuit CPS27 (BU/BN), harness side and C357-4, circuit CPS26 (YE/BU), harness side, while depressing the rear tilt switch up and down. Is the voltage greater than -10 volts when the rear tilt switch is pressed down, greater than +10 volts when the rear tilt switch is pressed up and 0 volt when the switch is in the rest position?	Yes INSTALL a new driver seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to H7.
H7 CHECK CIRCUIT CPS27 (BU/BN) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Driver Seat Control Switch C369. Measure the resistance between driver seat control switch C369-8, circuit CPS27 (BU/BN), harness side and driver seat motor C357-1, circuit CPS27 (BU/BN), harness side; and between driver seat control switch C369-8, circuit CPS27 (BU/BN), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes GO to H8. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
H8 CHECK CIRCUIT CPS26 (YE/BU) FOR AN OPEN AND SHORT TO GROUND
Measure the resistance between driver seat control switch C369-1, circuit CPS26 (YE/BU), harness side and driver seat motor C357-4, circuit CPS26 (YE/BU), harness side; and between driver seat control switch C369-1, circuit CPS26 (YE/BU), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
H9 CHECK THE VOLTAGE TO THE DRIVER SEAT FRONT HEIGHT MOTOR
Disconnect: Driver Seat Motor C357. Measure the voltage between driver seat motor C357-2, circuit CPS25 (WH/VT), harness side and C357-5, circuit CPS24 (GY), while pushing the rear tilting switch up and down. Is the voltage greater than +10 volts when the front tilt switch is pressed down, greater than -10 volts when the front tilt switch is pressed up and 0 volt when the switch is in the rest position?	Yes INSTALL a new driver seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to H10.
H10 CHECK CIRCUIT CPS25 (WH/VT) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Driver Seat Control Switch C369. Measure the resistance between driver seat control switch C369-7, circuit CPS25 (WH/VT), harness side and driver seat motor C357-2, circuit CPS25 (WH/VT), harness side; and between driver seat control switch C369-7, circuit CPS25 (WH/VT), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes GO to H11. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
H11 CHECK CIRCUIT CPS24 (GY) FOR AN OPEN
Measure the resistance between driver seat control switch C369-5, circuit CPS24 (GY) harness side, and driver seat motor C357-5, circuit CPS24 (GY), harness side; and between driver seat control switch C3069-5, circuit CPS24 (GY), harness side and ground. Is the resistance less than 5 ohms between the driver seat motor and the driver seat control switch; and greater than 10,000 ohms between the driver seat control switch and ground?	Yes INSTALL a new driver seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test I: The Power Seat Does Not Move Horizontally/Vertically/Recline — Passenger

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The passenger seat control switch is powered by battery voltage on circuit SBB31 (WH/RD) and is supplied ground on circuit GD139 (BK/YE). When pressed, the seat control switch supplies that voltage and ground to a power seat track motor or power recline motor to move the seat or backrest. When pressed in the opposite direction, the seat control switch reverses the polarity to that same power seat track motor or power recline motor, which moves the seat or backrest in the opposite direction. There are 3 power seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (front up/down and rear up/down). There is an additional motor in the power recline mechanism to move the seat backrest forward and rearward. If a new seat track motor needs to be installed, it is necessary to install an entire power seat track. The power recline motor is serviced separately.

Possible Causes

A passenger power seat that does not move horizontally and/or vertically can be caused by:

wiring, terminals or connectors.
a faulty seat control switch.
a faulty seat track motor (seat track).
a faulty power recliner mechanism.

PINPOINT TEST I: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY/RECLINE — PASSENGER

Test Step	Result / Action to Take
I1 CHECK THE HORIZONTAL DIRECTION MOTOR FOR CORRECT OPERATION
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the passenger seat side air bag C313. Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313. Connect the battery ground cable. Operate the passenger power seat forward and rearward. Will the seat move horizontally?	Yes GO to I2. No GO to I3.
I2 CHECK THE RECLINER MOTOR FOR CORRECT OPERATION
Recline the passenger backrest forward and rearward. Will the seat backrest recline forward and rearward?	Yes GO to I6. No GO to I13.
I3 CHECK THE VOLTAGE TO THE PASSENGER SEAT HORIZONTAL MOTOR
Disconnect: Passenger Seat Motor C3015. Measure the voltage between passenger seat motor C3015-6, circuit CPS38 (GN/BU), harness side and C3015-3, circuit CPS33 (WH), harness side, while pushing the passenger seat control switch forward and rearward. Is the voltage greater than +10 volts when the switch is pushed forward, greater than -10 volts when the switch is pushed rearward and 0 volt when the switch is in a rest position?	Yes INSTALL a new passenger seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to I4.
I4 CHECK CIRCUIT CPS38 (GN/BU) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Passenger Seat Control Switch C3190. Measure the resistance between passenger seat control switch C3190-9, circuit CPS38 (GN/BU), harness side and passenger seat motor C3015-6, circuit CPS38 (GN/BU), harness side; and between passenger seat control switch C3190-9, circuit CPS38 (GN/BU), harness side and ground. Is the resistance less than 5 ohms between the passenger seat motor and the passenger seat control switch; and greater than 10,000 ohms between the passenger seat control switch and ground?	Yes GO to I5. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
I5 CHECK CIRCUIT CPS33 (WH) FOR AN OPEN AND SHORT TO GROUND
Measure the resistance between passenger seat control switch C3190-4, circuit CPS33 (WH), harness side and passenger seat motor C3015-3, circuit CPS33 (WH), harness side; and between passenger seat control switch C3190-4, circuit CPS33 (WH), harness side and ground. Is the resistance less than 5 ohms between the passenger seat motor and the passenger seat control switch; and greater than 10,000 ohms between the passenger seat control switch and ground?	Yes INSTALL a new passenger seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
I6 DETERMINE THE SEAT TILTING FAILURE
Determine the seat tilting failure. Can the seat be tilted forward or backward?	Yes If only forward tilting operates, GO to I7 . If only rear tilting operates, GO to I10 . No INSTALL a new passenger seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
I7 CHECK THE VOLTAGE TO THE PASSENGER SEAT REAR HEIGHT MOTOR
Disconnect: Passenger Seat Motor C3015. Measure the voltage between passenger seat motor C3015-1, circuit CPS37 (WH/BU), harness side and C3015-4, circuit CPS36 (YE/GY), harness side, while depressing the rear tilt switch up and down. Is the voltage greater than -10 volts when the rear tilt switch is pressed down, greater than +10 volts when the rear tilt switch is pressed up and 0 volt when the switch is in the rest position?	Yes INSTALL a new passenger seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to I8.
I8 CHECK CIRCUIT CPS37 (WH/BU) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Passenger Seat Control Switch C3190. Measure the resistance between passenger seat control switch C3190-12, circuit CPS37 (WH/BU), harness side and passenger seat motor C3015-1, circuit CPS37 (WH/BU), harness side; and between passenger seat control switch C3190-12, circuit CPS37 (WH/BU), harness side and ground. Is the resistance less than 5 ohms between the passenger seat motor and the passenger seat control switch; and greater than 10,000 ohms between the passenger seat control switch and ground?	Yes GO to I9. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
I9 CHECK CIRCUIT CPS36 (YE/GY) FOR AN OPEN AND SHORT TO GROUND
Measure the resistance between passenger seat control switch C3190-1, circuit CPS36 (YE/GY), harness side and passenger seat motor C3015-4, circuit CPS36 (YE/GY), harness side; and between passenger seat control switch C3190-4, circuit CPS36 (YE/GY), harness side and ground. Is the resistance less than 5 ohms between the passenger seat motor and the passenger seat control switch; and greater than 10,000 ohms between the passenger seat control switch and ground?	Yes INSTALL a new passenger seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
I10 CHECK THE VOLTAGE TO PASSENGER SEAT FRONT HEIGHT MOTOR
Disconnect: Passenger Seat Motor C3015. Measure the voltage between passenger seat motor C3015-2, circuit CPS35 (VT/GN), harness side and C3015-5, circuit CPS34 (GY/BU), while pushing the rear tilting switch up and down. Is the voltage greater than +10 volts when the front tilt switch is pressed down, greater than -10 volts when the front tilt switch is pressed up and 0 volt when the switch is in the rest position?	Yes INSTALL a new passenger seat track assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to I11.
I11 CHECK CIRCUIT CPS35 (VT/GN) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Passenger Seat Control Switch C3190. Measure the resistance between passenger seat control switch C3190-6, circuit CPS35 (VT/GN), harness side and passenger seat motor C3015-2, circuit CPS35 (VT/GN), harness side; and between passenger seat control switch C3190-6, circuit CPS35 (VT/GN), harness side and ground. Is the resistance less than 5 ohms between the passenger seat motor and the passenger seat control switch; and greater than 10,000 ohms between the passenger seat control switch and ground?	Yes GO to I12. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
I12 CHECK CIRCUIT CPS34 (GY/BU) FOR AN OPEN
Measure the resistance between passenger seat control switch C3190-2, circuit CPS34 (GY/BU) harness side, and passenger seat motor C3015-5, circuit CPS34 (GY/BU), harness side; and between passenger seat control switch C3190-2, circuit CPS34 (GY/BU), harness side and ground. Is the resistance less than 5 ohms between the passenger seat motor and the passenger seat control switch; and greater than 10,000 ohms between the passenger seat control switch and ground?	Yes INSTALL a new passenger seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
I13 CHECK VOLTAGE TO THE PASSENGER SEAT RECLINER MOTOR
Disconnect: Passenger Seat Recliner Motor C3189. Measure the voltage between passenger seat recliner motor C3189-1, circuit CPS39 (GY/YE), harness side and C3189-5, circuit CPS40 (VT/GY), while pushing the recline switch forward and rearward. Is the voltage greater than -10 volts when the switch is pushed forward, greater than +10 volts when the switch is pushed rearward and 0 volt when the switch is in a rest position?	Yes INSTALL a new passenger seat recliner motor. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to I14.
I14 CHECK CIRCUIT CPS39 (GY/YE) FOR AN OPEN AND SHORT TO GROUND
Disconnect: Passenger Seat Control Switch C3190. Measure the resistance between passenger seat control switch C3190-11, circuit CPS39 (GY/YE), harness side and passenger seat recliner motor C3189-1, circuit CPS39 (GY/YE), harness side; and between passenger seat control switch C3190-11, circuit CPS39 (GY/YE), harness side and ground. Is the resistance less than 5 ohms between the passenger seat recliner motor and the passenger seat control switch; and greater than 10,000 ohms between the passenger seat control switch and ground?	Yes GO to I15. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
I15 CHECK CIRCUIT CPS40 (VT/GY) FOR AN OPEN AND SHORT TO GROUND
Measure the resistance between passenger seat control switch C3190-8, circuit CPS40 (VT/GY) harness side, and passenger seat recliner motor C3189-5, circuit CPS40 (VT/GY), harness side; and between passenger seat control switch C3190-8, circuit CPS40 (VT/GY), harness side and ground. Is the resistance less than 5 ohms between the passenger seat recliner motor and the passenger seat control switch; and greater than 10,000 ohms between the seat control switch and ground?	Yes INSTALL a new passenger seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test J: The Memory Seat Is Inoperative

Refer to Wiring Diagrams Cell 123, Memory Seats for schematic and connector information.

Refer to Wiring Diagrams Cell 149, Component Testing for schematic and connector information.

Normal Operation

The driver seat control switch is powered by battery voltage on circuit SBB15 (WH/RD) and is supplied ground on circuit GD126 (BK/WH). When pressed, the seat control switch supplies the voltage and ground to the applicable driver seat module (DSM) inputs. The DSM then supplies voltage and ground to the appropriate power seat track motor or power recline motor based on the inputs received from the seat control switch. When pressed in the opposite direction, the seat control switch reverses the polarity to the DSM inputs, and the DSM likewise reverses polarity of the appropriate power seat track motor or power recliner motor circuits causing the seat or backrest to move in the opposite direction. There are 3 power seat track motors that combine to move the seat horizontally (forward/rearward) and vertically (front up/down and rear up/down). The seat backrest power recliner mechanism uses a single motor to move the seat backrest forward and rearward.

Battery voltage is also supplied to DSM on circuit SBB15 (WH/RD) and SBB32 (VT/RD). Ground is supplied to the DSM on circuit GD126 (BK/WH).

Each motor, in the memory power seat track and power recliner mechanism contains a Hall-effect position sensor. The DSM supplies a signal feed circuit to each position sensor and a shared reference signal return circuit. Each position sensor sends a signal voltage back to the DSM used to monitor the position of the power seat and seat backrest. The DSM uses this information to return the seat to a stored pre-programmed position when pressing the memory seat position switch or a remote entry transmitter. The memory seat position switch is hard-wired to the driver door module (DDM) and communicates memory SET commands to the DSM via MS-CAN. Refer to Principles of Operation in this section or the owner's literature for information on programming the DDM for storing memory seat positions.

The following pinpoint test diagnoses a memory seat that does not operate in one or more directions when using the seat control switch. If the memory seat moves in all directions using the seat control switch, Go To Pinpoint Test K.

Possible Causes

An inoperative memory seat can be caused by:

a fuse.
wiring, terminals or connectors.
a faulty seat control switch.
a faulty power seat track.
a faulty power recliner motor.
a faulty DSM.

PINPOINT TEST J: THE MEMORY SEAT IS INOPERATIVE

Test Step

Result / Action to Take

J1 RETRIEVE THE DTCs

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the driver seat side air bag C327.

Connect restraint system diagnostic tool 418-133 to the driver seat side air bag C327.

Connect the battery ground cable.

Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool: Driver Seat Module (DSM) Self Test/Retrieve DTCs.
Are any DTCs retrieved?

Yes
If DTCs B1663, B1664, B1665 and B1666 are all retrieved, GO to J10 .

If DTC B1663, GO to J20 .

If DTC B1664, GO to J23 .

If DTC B1665, GO to J26 .

If DTC B1666, GO to J29 .

If DTC B1703, GO to J3 .

If DTC B1707, GO to J3 .

If DTC B1711, GO to J3 .

If DTC B1715, GO to J3 .

If DTC B1719, GO to J3 .

If DTC B1723, GO to J3 .

If DTC B1727, GO to J3 .

If DTC B1731, GO to J3 .

If DTC B1342, INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
GO to J2.

J2 MONITOR THE DSM PIDs AND CHECK FOR CORRECT MEMORY SEAT SWITCH INPUTS

Enter the following diagnostic mode on the diagnostic tool: Select DSM PIDs.
While monitoring the DSM driver seat control switch input status PIDs activate the seat control switch.
Do the PID values agree with the switch positions?

Yes
GO to J9.

No
VERIFY battery junction box (BJB) fuse 15 (10A) is OK.

If BJB fuse 15 (10A) fails while operating the seat control switch, DISCONNECT the seat control switch C3297 and GO to J7 .

If BJB fuse 15 (10A) is OK, GO to J3 .

J3 CHECK THE SEAT CONTROL SWITCH

Key in OFF position.
Disconnect: Seat Control Switch C3297.
Check the seat control switch.
Refer to Wiring Diagrams Cell 149, Component Testing for schematic and connector information.
Is the seat control switch OK?

Yes
GO to J4.

No
INSTALL a new seat control switch. REFER to Seat Control Switch in this section. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J4 CHECK CIRCUIT SBB15 (WH/RD) FOR VOLTAGE TO THE SEAT CONTROL SWITCH

Measure the voltage between seat control switch C3297-5, circuit SBB15 (WH/RD), harness side and ground.

Is the voltage greater than 10 volts?

Yes
GO to J5.

No
VERIFY battery junction box (BJB) fuse 15 (10A) is OK. If BJB fuse 15 (10A) is OK, REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J5 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN

Measure the resistance between seat control switch C3297-3, circuit GD126 (BK/WH), harness side and ground.

Is the resistance less than 5 ohms?

Yes
GO to J6.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J6 CHECK SEAT CONTROL SWITCH TO DRIVER SEAT MODULE CIRCUITS FOR A SHORT TO POWER

Disconnect: DSM C3299b.
Key in ON position.
Measure the voltage between the following seat control switch C3297 pins, harness side and ground.

Connector-Pin	Circuit
C3297-9	CPS06 (GN/WH)
C3297-4	CPS01 (GN/BU)
C3297-2	CPS03 (VT/GY)
C3297-6	CPS02 (GY/YE)
C3297-11	CPS07 (GY/BN)
C3297-8	CPS08 (VT/OG)
C3297-12	CPS04 (YE/OG)
C3297-1	CPS05 (BU/WH)

Is voltage indicated?

Yes
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

No
GO to J7.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J7 CHECK SEAT CONTROL SWITCH TO DRIVER SEAT MODULE CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between the following seat control switch C3297 pins, harness side and ground.

Connector-Pin	Circuit
C3297-9	CPS06 (GN/WH)
C3297-4	CPS01 (GN/BU)
C3297-2	CPS03 (VT/GY)
C3297-6	CPS02 (GY/YE)
C3297-11	CPS07 (GY/BN)
C3297-8	CPS08 (VT/OG)
C3297-12	CPS04 (YE/OG)
C3297-1	CPS05 (BU/WH)

Are the resistances greater than 10,000 ohms?

Yes
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
GO to J8.

J8 CHECK SEAT CONTROL SWITCH TO DRIVER SEAT MODULE CIRCUITS FOR AN OPEN

Measure the resistance between the following seat control switch C3297 pins, harness side and DSM C3299b pins, harness side.

Seat Control Switch Connector-Pin	Circuit	DSM Connector-Pin
C3297-9	CPS06 (GN/WH)	C3299b-15
C3297-4	CPS01 (GN/BU)	C3299b-3
C3297-2	CPS03 (VT/GY)	C3299b-14
C3297-6	CPS02 (GY/YE)	C3299b-2
C3297-11	CPS07 (GY/BN)	C3299b-17
C3297-8	CPS08 (VT/OG)	C3299b-5
C3297-12	CPS04 (YE/OG)	C3299b-4
C3297-1	CPS05 (BU/WH)	C3299b-16

Are the resistances less than 5 ohms?

Yes
INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs. DISCONNECT the battery ground cable.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J9 CHECK THE DSM FOR CORRECT OUTPUTS USING A DIAGNOSTIC TOOL AND DSM ACTIVE COMMANDS

Enter the following diagnostic mode on the diagnostic tool: Active Commands: DRIVER SEAT OUTPUT CONTROL.
Toggle the following DSM active commands ON and OFF while monitoring the seat movement:

FRONT MOTOR UP

FRONT MOTOR DOWN

REAR MOTOR UP

REAR MOTOR DOWN

HORIZONTAL MOTOR FORWARD

HORIZONTAL MOTOR BACKWARD

RECLINE MOTOR FORWARD

RECLINE MOTOR BACKWARD

Does the driver seat operate correctly?

Yes
INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
If no seat movement, GO to J10 .

If no front vertical seat movement, GO to J20 .

If no rear vertical seat movement, GO to J23 .

If no horizontal seat movement, GO to J26 .

If no recline seat movement, GO to J29 .

J10 CHECK DSM CIRCUIT SBB32 (VT/RD) FOR VOLTAGE

Key in OFF position.
Disconnect: DSM C3299a.
Measure the voltage between DSM C3299a-2, circuit SBB32 (VT/RD), harness side and ground.

Is the voltage greater than 10 volts?

Yes
GO to J11.

No
VERIFY battery junction box (BJB) fuse 32 (30A) is OK. If OK, REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J11 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN

Disconnect: DSM C3299c.
Measure the resistance between DSM C3299a-1, circuit GD126 (BK/WH), harness side and ground; and between DSM C3299c-13 pin 13, circuit GD126 (BK/WH), harness side and ground.

Is the resistance less than 5 ohms?

Yes
GO to J12.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J12 CHECK CIRCUITS CPS24 (GY) AND CPS25 (WH/VT) FOR A SHORT TO GROUND

Disconnect: DSM C3299b.
Measure the resistance between DSM C3299b-9, circuit CPS25 (WH/VT), harness side and ground; and between DSM C3299b-23, circuit CPS24 (GY), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to J14.

No
GO to J13.

J13 CHECK FRONT HEIGHT POWER SEAT MOTOR CIRCUITS CPS25 (WH/VT) AND CPS24 (GY) FOR A SHORT TO GROUND

Disconnect: Power Seat Motor C357.
Measure the resistance between DSM C3299b-9, circuit CPS25 (WH/VT), harness side and ground; and between DSM C3299b-23, circuit CPS24 (GY), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new driver seat track assembly. REFER to Seat Track in this section. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J14 CHECK CIRCUITS CPS27 (BU/BN) AND CPS26 (YE/BU) FOR A SHORT TO GROUND

Measure the resistance between DSM C3299b-8, circuit CPS27 (BU/BN), harness side and ground; and between DSM C3299b-22, circuit CPS26 (YE/BU), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to J16.

No
GO to J15.

J15 CHECK THE REAR HEIGHT POWER SEAT MOTOR CIRCUITS CPS27 (BU/BN) AND CPS26 (YE/BU) FOR A SHORT TO GROUND

Disconnect: Power Seat Motor C357.
Measure the resistance between DSM C3299b-8, circuit CPS27 (BU/BN), harness side and ground; and between DSM C3299b-22, circuit CPS26 (YE/BU), harness side and ground.

Are the resistances greater than 10,000 ohms?

J16 CHECK CIRCUITS CPS23 (GN/VT) AND CPS22 (BN) FOR A SHORT TO GROUND

Measure the resistance between DSM C3299b-10, circuit CPS23 (GN/VT), harness side and ground; and between DSM C3299b-12, circuit CPS22 (BN), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to J18.

No
GO to J17.

J17 CHECK THE HORIZONTAL POWER SEAT MOTOR CIRCUITS CPS23 (GN/VT) AND CPS22 (BN) FOR A SHORT TO GROUND

Disconnect: Power Seat Motor C357.
Measure the resistance between DSM C3299b-10, circuit CPS23 (GN/VT), harness side and ground; and between DSM C3299b-12, circuit CPS22 (BN), harness side and ground.

Are the resistances greater than 10,000 ohms?

J18 CHECK CIRCUITS CPS29 (WH/BN) AND CPS30 (VT/BN) FOR A SHORT TO GROUND

Measure the resistance between DSM C3299b-11, circuit CPS29 (WH/BN), harness side and ground; and between DSM C3299b-21, circuit CPS30 (VT/BN), harness side and ground.

Are the resistances greater than 10,000 ohms?

J19 CHECK THE DRIVER POWER SEAT RECLINER MOTOR CIRCUITS CPS29 (WH/BN) AND CPS30 (VT/BN) FOR A SHORT TO GROUND

Disconnect: Driver Power Seat Recliner Motor C3187.
Measure the resistance between DSM C3299b-11, circuit CPS29 (WH/BN), harness side and ground; and between DSM C3299b-21, circuit CPS30 (VT/BN), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new driver seat recliner motor. REFER to Seat Recliner Motor in this section. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J20 CHECK THE FRONT HEIGHT POWER SEAT MOTOR FOR CORRECT OPERATION

Key in OFF position.
Disconnect: Power Seat Motor C357.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: DSM Active Command: DRIVER SEAT OUTPUT CONTROL.
Measure the voltage between power seat motor C357-2, circuit CPS25 (WH/VT) and C357-5, circuit CPS24 (GY), harness side while toggling DSM active commands FRONT MOTOR UP and FRONT MOTOR DOWN, ON and OFF.

Is voltage present when the motor is commanded ON and no voltage present when commanded OFF?

J21 CHECK CIRCUITS CPS25 (WH/VT) AND CPS24 (GY) FOR A SHORT TO POWER

Key in OFF position.
Disconnect: DSM C3299b.
Key in ON position.
Measure the voltage between DSM C3299b-9, circuit CPS25 (WH/VT), harness side and ground; and between DSM C3299b-23, circuit CPS24 (GY), harness side and ground.

Is voltage indicated?

J22 CHECK CIRCUITS CPS25 (WH/VT) AND CPS24 (GY) FOR AN OPEN

Key in OFF position.
Measure the resistance between DSM C3299b-9, circuit CPS25 (WH/VT), harness side and power seat motor C357-2, circuit CPS25 (WH/VT), harness side; and between DSM C3299b-23, circuit CPS24 (GY), harness side and power seat motor C357-5, circuit CPS24 (GY), harness side.

Are the resistances less than 5 ohms?

Yes
INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J23 CHECK THE REAR HEIGHT MOTOR FOR CORRECT OPERATION

Key in OFF position.
Disconnect: Power Seat Motor C357.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: DSM Active Command: DRIVER SEAT OUTPUT CONTROL.
Measure the voltage between power seat motor C357-1, circuit CPS27 (BU/BN), harness side and C357-4, circuit CPS26 (YE/BU), harness side while toggling DSM active commands REAR MOTOR UP and REAR MOTOR DOWN, ON and OFF.

Is voltage present when the motor is commanded ON and no voltage present when commanded OFF?

J24 CHECK CIRCUITS CPS27 (BU/BN) AND CPS26 (YE/BU) FOR A SHORT TO POWER

Key in OFF position.
Disconnect: DSM C3299b.
Key in ON position.
Measure the voltage between DSM C3299b-8, circuit CPS27 (BU/BN), harness side and ground; and between DSM C3299b-22, circuit CPS26 (YE/BU), harness side and ground.

Is voltage indicated?

Yes
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

No
GO to J25.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J25 CHECK CIRCUITS CPS27 (BU/BN) AND CPS26 (YE/BU) FOR AN OPEN

Key in OFF position.
Measure the resistance between DSM C3299b-8, circuit CPS27 (BU/BN), harness side and power seat motor C357-1, circuit CPS27 (BU/BN), harness side; and between DSM C3299b-22, circuit CPS26 (YE/BU), harness side and rear height power seat motor C357-4, circuit CPS26 (YE/BU), harness side.

Are the resistances less than 5 ohms?

Yes
INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J26 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION

Key in OFF position.
Disconnect: Power Seat Motor C357.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: DSM Active Command: DRIVER SEAT OUTPUT CONTROL.
Measure the voltage between power seat motor C357-3, circuit CPS22 (BN) and C357-6, circuit CPS23 (GN/VT), harness side while toggling DSM active commands HORIZONTAL MOTOR FORWARD and HORIZONTAL MOTOR BACKWARD, ON and OFF.

Is voltage present when the motor is commanded ON and no voltage present when commanded OFF?

J27 CHECK CIRCUITS CPS22 (BN) AND CPS23 (GN/VT) FOR A SHORT TO POWER

Key in OFF position.
Disconnect: DSM C3299b.
Key in ON position.
Measure the voltage between DSM C3299b-10, circuit CPS23 (GN/VT), harness side and ground; and between DSM C3299b-12, circuit CPS22 (BN), harness side and ground.

Is voltage indicated?

J28 CHECK CIRCUITS CPS23 (GN/VT) AND CPS22 (BN) FOR AN OPEN

Key in OFF position.
Measure the resistance between DSM C3299b-10, circuit CPS23 (GN/VT), harness side and power seat motor C357-6, circuit CPS23 (GN/VT), harness side; and between DSM C3299b-12, circuit CPS22 (BN), harness side and horizontal power seat motor C357-3, circuit CPS22 (BN), harness side.

Are the resistances less than 5 ohms?

Yes
INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

J29 CHECK THE DRIVER SEAT POWER RECLINER MOTOR FOR CORRECT OPERATION

Key in OFF position.
Disconnect: Driver Seat Power Recliner Motor C3187.
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool: DSM Active Command: DRIVER SEAT OUTPUT CONTROL.
Measure the voltage between driver seat power recliner motor C3187-1, circuit CPS29 (WH/BN) and C3187-5, circuit CPS30 (VT/BN), harness side while toggling DSM active commands RECLINE MOTOR FORWARD and RECLINE MOTOR BACKWARD, ON and OFF.

Is voltage present when the motor is commanded ON and no voltage present when commanded OFF?

J30 CHECK CIRCUITS CPS29 (WH/BN) AND CPS30 (VT/BN) FOR A SHORT TO POWER

Key in OFF position.
Disconnect: DSM C3299b.
Key in ON position.
Measure the voltage between DSM C3299b-11, circuit CPS29 (WH/BN), harness side and ground; and between DSM C3299b-21, circuit CPS30 (VT/BN), harness side and ground.

Is voltage indicated?

J31 CHECK CIRCUITS CPS29 (WH/BN) AND CPS30 (VT/BN) FOR AN OPEN

Key in OFF position.
Measure the resistance between DSM C3299b-11, circuit CPS29 (WH/BN), harness side and recliner power seat motor C3187-1, circuit CPS29 (WH/BN), harness side; and between DSM C3229b-21, circuit CPS30 (VT/BN), harness side and recliner power seat motor C3187-5, circuit CPS30 (VT/BN), harness side.

Are the resistances less than 5 ohms?

Yes
INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test K: The Memory Seat Does Not Operate Correctly — Does Not Operate Using The Memory Set Switch

Refer to Wiring Diagrams Cell 123, Memory Seats for schematic and connector information.

Normal Operation

The driver seat control switch is powered by battery voltage on circuit SBB15 (VT/RD) and is supplied ground on circuit GD126 (BK/WH). When pressed, the seat control switch supplies the voltage and ground to the applicable driver seat module (DSM) inputs. The DSM then supplies voltage and ground to the appropriate power seat track motor or power recline motor based on the inputs received from the seat control switch. When pressed in the opposite direction, the seat control switch reverses the polarity to the DSM inputs, and the DSM likewise reverses polarity of the appropriate power seat track motor or power recliner motor circuits causing the seat or backrest to move in the opposite direction. There are 3 power seat track motors that combine to move the seat horizontally (forward/rearward) and vertically (front up/down and rear up/down). The seat backrest power recliner mechanism uses a single motor to move the seat backrest forward and rearward.

Battery voltage is also supplied to DSM on circuit SBB15 (WH/RD) and SBB32 (VT/RD). Ground is supplied to the DSM on circuit GD126 (BK/WH).

Each motor, in the memory power seat track and power recliner mechanism contains a Hall-effect position sensor. The DSM supplies a signal feed circuit to each position sensor and a shared reference signal return circuit. Each position sensor sends a signal voltage back to the DSM used to monitor the position of the power seat and seat backrest. The DSM uses this information to return the seat to a stored pre-programmed position when pressing the memory SET switch or a remote entry transmitter. The memory set switch is hard-wired to the driver door module (DDM) and communicates memory SET commands to the DSM via MS-CAN. Refer to Principles of Operation in this section or the owner's literature for information on programming the DDM for storing memory seat positions.

The following pinpoint test diagnoses a memory seat that does not operate correctly using the memory set switch. If the memory seat does not move in all directions using the seat control switch, Go To Pinpoint Test J.

Possible Causes

A memory seat that does not operate correctly can be caused by:

wiring, terminals or connectors.
a faulty memory set switch.
a faulty remote entry transmitter.
a faulty memory power seat track.
a faulty recliner mechanism.
a faulty DSM.

PINPOINT TEST K: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY — DOES NOT OPERATE USING THE MEMORY SET SWITCH

Test Step	Result / Action to Take
K1 RETRIEVE THE DTCs
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag C327. Connect restraint system diagnostic tool 418-133 to the driver seat side air bag C327. Connect the battery ground cable. Connect the diagnostic tool. Enter the following diagnostic mode on the diagnostic tool: Driver Seat Module (DSM) and Driver Door Module (DDM) Self Test/Retrieve DTCs. NOTE: During the DDM On-Demand Self Test, document when the memory SET LED illuminates and turns off. Are any DSM or DDM DTCs retrieved or does the memory SET LED fail to illuminate during the DDM On-Demand Self Test?	Yes If the memory SET LED fails to illuminate during the DDM On-Demand Self Test, GO to Section 501-09. If DTC B2084, GO to Section 501-09. If DTCs B1952, B1956, B1960 and B1964 are all retrieved, GO to K3 . If DTCs B1953, B1957, B1961 and B1965 are all retrieved, GO to K3 . If DTC B1530, GO to Section 501-09. If DTC B1534, GO to Section 501-09. If DTC B1538, GO to Section 501-09. If DTC B1663, GO to K4 . If DTC B1664, GO to K7 . If DTC B1665, GO to K10 . If DTC B1666, GO to K13 . If DTC B1952, GO to K7 . If DTC B1953, GO to K7 . If DTC B1956, GO to K4 . If DTC B1957, GO to K4 . If DTC B1960, GO to K13 . If DTC B1961, GO to K13 . If DTC B1964, GO to K10 . If DTC B1965, GO to K10 . If DTC B1342, INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to K2.
K2 MONITOR THE DDM PIDs AND CHECK THE DDM FOR CORRECT MEMORY SET SWITCH INPUTS
Enter the following diagnostic mode on the diagnostic tool: Monitor DDM PIDs: MEMORY SET/RECALL INPUT SWITCH STATUS. Monitor the DDM memory set switch PIDs while activating the memory switch SET, recall 1 and recall 2 buttons. Do the PID values agree with the switch button positions?	Yes GO to K3. No GO to Section 501-09.
K3 MONITOR THE DSM PIDs
Place the seat in a central position, using the seat control switch. Enter the following diagnostic mode on the diagnostic tool: Monitor PIDs. Monitor DSM PID: DRIVER SEAT/MIRROR/PEDAL SENSOR OUTPUT STATUS DRIVER SEAT FRONT UP/DOWN POSITION SENSOR PRESENT DRIVER SEAT REAR UP/DOWN POSITION SENSOR PRESENT DRIVER SEAT FORWARD/REARWARD POSITION SENSOR PRESENT DRIVER SEAT RECLINE POSITION SENSOR PRESENT Does each PID indicate the sensor is present?	Yes INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No If the PID indicates driver seat front vertical position sensor is not present, GO to K4 . If the PID indicates driver seat rear vertical position sensor is not present, GO to K7 . If the PID indicates driver seat horizontal position sensor is not present, GO to K10 . If the PID indicates driver seat recline position sensor is not present, GO to K13 .
K4 CHECK CIRCUITS VPS10 (BU/GN) AND RPS13 (GN/OG) FOR A SHORT TO POWER
Key in OFF position. Disconnect: DSM C3299b. Disconnect: Memory Seat Position Sensor C358. Key in ON position. Measure the voltage between memory seat position sensor C358-2, circuit VPS10 (BU/GN), harness side and ground; and between memory seat position sensor 358-5, circuit RPS13 (GN/OG), harness side and ground. Is voltage indicated?	Yes REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to K5.
K5 CHECK CIRCUITS VPS10 (BU/GN) AND RPS13 (GN/OG) FOR A SHORT TO GROUND
Key in OFF position. Measure the resistance between memory seat position sensor C358-2, circuit VPS10 (BU/GN), harness side and ground; and between memory seat position sensor 358-5, circuit RPS13 (GN/OG), harness side and ground. Are the resistances greater than 10,000 ohms?	Yes GO to K6. No REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
K6 CHECK CIRCUITS VPS10 (BU/GN) AND RPS13 (GN/OG) FOR AN OPEN
Measure the resistance between memory seat position sensor C358-2, circuit VPS10 (BU/GN), harness side and DSM C3299b-7, circuit VPS10 (BU/GN), harness side; and between memory seat position sensor 358-5, circuit RPS13 (GN/OG), harness side and DSM C3299b-20, circuit RPS13 (GN/OG), harness side. Are the resistances less than 5 ohms?	Yes INSTALL a new driver seat track assembly. REFER to Seat Track in this section. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
K7 CHECK CIRCUITS VPS11 (GN/BN) AND RPS13 (GN/OG) FOR A SHORT TO POWER
Key in OFF position. Disconnect: DSM C3299b. Disconnect: Memory Seat Position Sensor C358. Measure the voltage between memory seat position sensor C358-1, circuit VPS11 (GN/BN), harness side and ground; and between driver seat position sensor C358-4, circuit RPS13 (GN/OG), harness side and ground. Is voltage indicated?	Yes REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to K8.
K8 CHECK CIRCUITS VPS11 (GN/BN) AND RPS13 (GN/OG) FOR A SHORT TO GROUND
Key in OFF position. Measure the resistance between memory seat position sensor C358-1, circuit VPS11 (GN/BN), harness side and ground; and between memory seat position sensor C358-4, circuit RPS13 (GN/OG), harness side and ground. Are the resistances greater than 10,000 ohms?	Yes GO to K9. No REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
K9 CHECK CIRCUITS VPS11 (GN/BN) AND RPS13 (GN/OG) AND FOR AN OPEN
Measure the resistance between memory position sensor C358-1, circuit VPS11 (GN/BN), harness side and DSM C3299b-18, circuit VPS11 (GN/BN), harness side; and between memory seat position sensor C358-4, circuit RPS13 (GN/OG), harness side and DSM C3299b-20, circuit RPS13 (GN/OG), harness side. Are the resistances less than 5 ohms?	Yes INSTALL a new driver seat track assembly. REFER to Seat Track in this section. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit(s) in question. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
K10 CHECK CIRCUITS VPS09 (BN/BU) AND RPS13 (GN/OG) AND FOR A SHORT TO POWER
Key in OFF position. Disconnect: DSM C3299b. Disconnect: Memory Seat Position Sensor C358. Measure the voltage between memory seat position sensor C358-3, circuit VPS09 (BN/BU), harness side and ground; and between memory seat position sensor C358-6, circuit RPS13 (GN/OG), harness side and ground. Is voltage indicated?	Yes REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to K11.
K11 CHECK CIRCUITS VPS09 (BN/BU) AND RPS13 (GN/OG) FOR A SHORT TO GROUND
Key in OFF position. Measure the resistance between memory seat position sensor C358-3, circuit VPS09 (BN/BU), harness side and ground; and between memory seat position sensor C358-6, circuit RPS13 (GN/OG), harness side and ground. Are the resistances greater than 10,000 ohms?	Yes GO to K12. No REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
K12 CHECK CIRCUITS VPS09 (BN/BU) AND RPS13 (GN/OG) FOR AN OPEN
Measure the resistance between memory seat position sensor C358-3, circuit VPS09 (BN/BU), harness side and DSM C3299b-19, circuit VPS09 (BN/BU), harness side; and between memory seat position sensor C358-6, circuit RPS13 (GN/OG), harness side and DSM C3299b-20, circuit RPS13 (GN/OG), harness side. Are the resistances less than 5 ohms?	Yes INSTALL a new driver seat track assembly. REFER to Seat Track in this section. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
K13 CHECK CIRCUITS RPS13 (GN/OG) AND LPS12 (VT/RD) FOR A SHORT TO POWER
Key in OFF position. Disconnect: DSM C32991b. Disconnect: Driver Seat Recliner Motor C3187. Measure the voltage between driver seat recliner motor C3187-2, circuit RPS13 (GN/OG), harness side and ground; and between driver seat recliner motor C3187-4, circuit LPS12 (VT/RD), harness side and ground. Is voltage indicated?	Yes REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to K14.
K14 CHECK CIRCUITS RPS13 (GN/OG) AND LPS12 (VT/RD) FOR A SHORT TO GROUND
Key in OFF position. Measure the resistance between driver seat recliner motor C3187-2, circuit RPS13 (GN/OG), harness side and ground; and between driver seat recliner motor C3187-4, circuit LPS12 (VT/RD), harness side and ground. Are the resistances greater than 10,000 ohms?	Yes GO to K15. No REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
K15 CHECK CIRCUITS RPS13 (GN/OG) AND LPS12 (VT/RD) FOR AN OPEN
Measure the resistance between driver seat recliner motor C3187-2, circuit RPS13 (GN/OG), harness side and DSM C3299b-20, circuit RPS13 (GN/OG), harness side; and between driver seat recliner motor C3187-4, circuit LPS12 (VT/RD), harness side and DSM C3299b-6, circuit LPS12 (VT/RD), harness side. Are the resistances less than 5 ohms?	Yes INSTALL a new driver seat recliner motor. REFER to Seat Recliner Motor in this section. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test L: Easy Exit/Easy Entry Is Inoperative/Does Not Operate Correctly

Normal Operation

The DSM receives a key out command over the MS-CAN communication network and powers the driver seat rearward about 2 inches.

Possible Causes

An inoperative/not operating correctly easy exit/easy entry seat can be caused by:

wiring, terminals or connectors.
a faulty key-in-ignition warning switch.
a faulty instrument cluster module (ICM).
a faulty driver seat module (DSM).

PINPOINT TEST L: EASY EXIT/EASY ENTRY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

Test Step	Result / Action to Take
L1 CHECK THE DRIVER POWER SEAT OPERATION
Key in ON position. Verify the driver power seat operates forward and rearward. Does the power seat operate forward and rearward correctly?	Yes GO to L2. No REFER to the Symptom Chart for diagnosis of inoperative driver power seat horizontal movement.
L2 CHECK THE EASY EXIT OPERATION
Position the driver seat at least 2 inches from the rear stop point. Key in OFF position. Remove the key from the ignition switch. Does the driver power seat move rearward approximately 2 inches?	Yes GO to L5. No GO to L3.
L3 CHECK THE INSTRUMENT CLUSTER MODULE (ICM) FOR CORRECT INPUTS
Connect the diagnostic tool. Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Module (ICM) ignition switch status PIDs. Monitor the ICM ignition switch status PIDs with the ignition key in and with the key removed. Does the ICM PID agree with the switch positions?	Yes GO to L4. No To diagnose the key-in-ignition warning switch fault, REFER to Section 413-09.
L4 CHECK FOR DTCS FROM THE DSM
Enter the following diagnostic mode on the diagnostic tool: Driver Seat Module (DSM) Self Test/Retrieve DTCs. Are any DSM DTCs present?	Yes REFER to the Driver Seat Module (DSM) DTC Index for DSM DTC diagnosis. No INSTALL a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01. REPEAT the self test. CLEAR the DTCs.
L5 CHECK THE EASY ENTRY OPERATION
Insert the ignition key. Does the driver power seat move forward approximately 2 inches?	Yes The system is operating correctly at this time. RETEST the system for intermittent operation. If no fault is found, INSTRUCT the customer on the correct operation of the system. No Install a new DSM. REFER to Section 419-10. CARRY OUT programmable module installation (PMI). REFER to Section 418-01.

Pinpoint Test M: The Power Lumbar Is Inoperative — Driver

Refer to Wiring Diagrams Cell 123, Memory Seats for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage on circuit SBB15 (WH/RD) and is supplied ground on circuit GD126 (BK/WH). When the knob of the seat control switch is pressed, voltage and ground are supplied to the power lumbar motor. When pressing the lumbar knob in the opposite direction, the lumbar control switch reverses the polarity to the power lumbar motor, which moves the lumbar mechanism in the opposite direction.

Possible Causes

An inoperative power lumbar can be caused by:

wiring, terminals or connectors.
a faulty lumbar control switch.
a faulty power lumbar motor assembly.

PINPOINT TEST M: THE POWER LUMBAR IS INOPERATIVE — DRIVER

Test Step	Result / Action to Take
M1 CHECK CIRCUIT SBB15 (WH/RD) FOR AN OPEN
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag C327. Connect restraint system diagnostic tool 418-133 to the driver seat side air bag C327. Connect the battery ground cable. Disconnect: Seat Control Switch C3297. Measure the voltage between seat control switch C3297-5, circuit SBB15 (WH/RD), harness side and ground. Is the voltage greater than 10 volts?	Yes GO to M2. No VERIFY battery junction box (BJB) fuse 15 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
M2 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
Measure the resistance between seat control switch C3297-3, circuit GD126 (BK/WH), harness side and ground. Is the resistance less than 5 ohms?	Yes GO to M3. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
M3 CHECK THE LUMBAR MOTOR
Connect: Seat Control Switch C3297. Disconnect: Power Lumbar Motor C3215. For power seat, measure the voltage between power lumbar motor C3215-1, circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-2, circuit CPS19 (GY/VT), harness side. Operate the seat control switch in both directions. Is the voltage greater than 10 volts in both directions?	Yes INSTALL a new power lumbar assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No GO to M4.
M4 CHECK CIRCUIT CPS19 (GY/VT) AND CIRCUIT CPS18 (BN/GN) FOR A SHORT TO GROUND
Disconnect: Seat Control Switch C3297. Measure the resistance between seat control switch C3297-7, circuit CPS18 (BN/GN), harness side and ground; and between seat control switch C3297-10, circuit CPS19 (GY/VT), harness side and ground. Are the resistances greater than 10,000 ohms.	Yes GO to M5. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.
M5 CHECK CIRCUIT CPS19 (GY/VT), CIRCUIT CPS18 (GN/RD) AND CPS18 (BN/GN) FOR AN OPEN
Measure the resistance between seat control switch C3297-7, circuit CPS18 (BN/GN), harness side and power lumbar motor C3215-1, circuit CPS18 (BN/GN), harness side; and between seat control switch C3297-10, circuit CPS19 (GY/VT), harness side and power lumbar motor C3215-2, circuit CPS19 (GY/VT), harness side. Are the resistances less than 5 ohms?	Yes INSTALL a new seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test N: The Power Lumbar Is Inoperative — Passenger

Refer to Wiring Diagrams Cell 120, Power Seats for schematic and connector information.

Normal Operation

The seat control switch is powered by battery voltage on circuit SBP31 (WH/RD) and is supplied ground on circuit GD139 (BK/YE). When the knob of the seat control switch is pressed, voltage and ground are supplied to the power lumbar motor. When pressing the lumbar knob in the opposite direction, the lumbar control switch reverses the polarity to the power lumbar motor, which moves the lumbar mechanism in the opposite direction.

Possible Causes

An inoperative power lumbar can be caused by:

wiring, terminals or connectors.
a faulty lumbar control switch.
a faulty power lumbar motor assembly.

PINPOINT TEST N: THE POWER LUMBAR IS INOPERATIVE — PASSENGER

Test Step	Result / Action to Take
N1 CHECK CIRCUIT SBB31 (WH/RD) FOR AN OPEN
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the passenger seat side air bag C313. Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313. Connect the battery ground cable. Disconnect: Seat Control Switch C3190. Measure the voltage between seat control switch C3190-5 , circuit SBB31 (WH/RD), harness side and ground. Is the voltage greater than 10 volts?	Yes GO to N2. No VERIFY battery junction box (BJB) fuse 31 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
N2 CHECK CIRCUIT GD139 (BK/YE) FOR AN OPEN
Measure the resistance between seat control switch C3190-3, circuit GD139 (BK/YE), harness side and ground. Is the resistance less than 5 ohms?	Yes GO to N3. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
N3 CHECK THE LUMBAR MOTOR
Connect: Seat Control Switch C3190. Disconnect: Power Lumbar Motor C3216. For power seat, measure the voltage between power lumbar motor C3216-1, circuit CPS20 (WH/OG), harness side and power lumbar motor C3216-2, circuit CPS21 (YE/BK), harness side. Operate the seat control switch in both directions. Is the voltage greater than 10 volts in both directions?	Yes INSTALL a new power lumbar assembly. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to N4.
N4 CHECK CIRCUIT CPS20 (VT) AND CIRCUIT CPS21 (YE/BK) FOR A SHORT TO GROUND
Disconnect: Seat Control Switch C3190. Measure the resistance between seat control switch C3190-7, circuit CPS20 (VT), harness side and ground; and between seat control switch C3190-10, circuit CPS21 (YE/BK), harness side and ground. Are the resistances greater than 10,000 ohms.	Yes GO to N5. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
N5 CHECK CIRCUIT CPS20 (VT), CIRCUIT CPS20 (WH/OG) AND CIRCUIT CPS21 (YE/BK) FOR AN OPEN
Measure the resistance between seat control switch C3190-7, circuit CPS20 (VT), harness side and power lumbar motor C3215-1, circuit CPS20 (WH/OG), harness side; and between seat control switch C3190-10, circuit CPS21 (YE/BK), harness side and power lumbar motor C3215-2, circuit CPS21 (YE/BK), harness side. Are the resistances less than 5 ohms?	Yes INSTALL a new seat control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test O: The Heated Seat Is Inoperative — Driver

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

The heated seat module receives ignition voltage feed on circuit CBP19 (BN/WH), battery voltage feed on circuit SBB11 (BU/RD) and is supplied ground on circuit GD139 (BK/YE). When ignition switched power is supplied and the driver heated seat button on the electronic automatic temperature control (EATC) module is pressed, a momentary ground signal is sent to the heated seat module on circuit CHS29 (WH/BU) to command the system ON or OFF. Upon receiving a signal, the heated seat module will decrease one setting (the sequence is HI, LO, OFF, HI, etc.). The heated seat module supplies voltage to the cushion and backrest heater mats on circuit CHS02 (YE/BU). Ground to the heater mats is provided on circuit GD126 (BK/WH). The cushion and backrest heater mats are connected in series and operate together. Temperature is maintained by the heated seat module using a sensor contained within the cushion heater mat. The heated seat module supplies a reference voltage to the temperature sensor on circuit RHS05 (YE/VT) and monitors the signal from the temperature sensor on circuit VHS26 (VT) for controlling current flow to the heater mats. The heated seat module is designed to remain ON, heating the seat and maintaining temperature until switched OFF or a 15-minute time-out period occurs.

Possible Causes

An inoperative driver heated seat can be caused by:

an open fuse.
faulty wiring, terminals or connectors.
a faulty heater mat.
a faulty heated seat module.
a faulty EATC module.

PINPOINT TEST O: THE HEATED SEAT IS INOPERATIVE — DRIVER

Test Step	Result / Action to Take
O1 CHECK CIRCUIT SBB11 (BU/RD) FOR VOLTAGE TO THE HEATED SEAT MODULE
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag module C327. Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327. Disconnect the passenger seat side air bag module C313. Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. Connect the battery ground cable. Disconnect: Heated Seat Module C3304. Measure the voltage between heated seat module C3304-1, circuit SBB11 (BU/RD) harness side and ground and C3304-17, circuit SBB11 (BU/RD) harness side and ground. Is the voltages greater than 10 volts?	Yes GO to O2. No VERIFY battery junction box (BJB) fuse 11 (20A Fusion and Milan) (30A MKZ) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O2 CHECK CIRCUIT CBP19 (BN/WH) FOR VOLTAGE TO THE HEATED SEAT MODULE
Key in ON position. Measure the voltage between heated seat module C3304-2, circuit CBP19 (BN/WH), harness side and ground. Is the voltage greater than 10 volts?	Yes GO to O3. No VERIFY smart junction box (SJB) fuse 28 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O3 CHECK HEATED SEAT MODULE GROUND CIRCUIT GD139 (BK/YE)
Key in OFF position. Measure the resistance between heated seat module C3304-7, circuit GD139 (BK/YE), harness side and ground. Is the resistance less than 5 ohms?	Yes GO to O4. No REPAIR circuit GD139 (BK/YE). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O4 CHECK CIRCUIT CHS02 (YE/BU) FOR SHORT TO VOLTAGE
Disconnect: Driver Seat Cushion Heater C364. Key in ON position. For MKZ, measure the voltage between driver seat cushion heater C3298-1, circuit CHS02 (YE/BU), harness side and ground. For Fusion and Milan, measure the voltage between driver seat cushion heater C364-1, circuit CHS02 (YE/BU), harness side and ground. Is voltage present on the circuit?	Yes REPAIR circuit CHS02 (YE/BU). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to O5.
O5 CHECK CIRCUIT CHS02 (YE/BU) FOR AN OPEN OR SHORT TO GROUND
Key in OFF position. For MKZ, measure the resistance between driver seat cushion heater C3298-1, circuit CHS02 (YE/BU), harness side and ground; and between C3298-1, circuit CHS02 (YE/BU), harness side and heated seat module C3304-9, circuit CHS02 (YE/BU) harness side. For Fusion and Milan, measure the resistance between driver seat cushion heater C364-1, circuit CHS02 (YE/BU), harness side and ground; and between C364-1, circuit CHS02 (YE/BU), harness side and heated seat module C3304-9, circuit CHS02 (YE/BU) harness side. Is the resistance greater than 10,000 ohms between the driver seat cushion heater and ground and less than 5 ohms between the driver seat cushion heater and the heated seat module?	Yes GO to O6. No REPAIR circuit CHS02 (YE/BU). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O6 CHECK CIRCUIT CHS11 (VT/GN) FOR SHORT TO VOLTAGE
Disconnect: Driver Seat Backrest Heater C365. Key in ON position. For MKZ, measure the voltage between driver seat cushion heater C3298-2, circuit CHS11 (VT/GN), harness side and ground. For Fusion and Milan, measure the voltage between driver seat cushion heater C364-2, circuit CHS11 (VT/GN), harness side and ground. Is voltage present on the circuit?	Yes REPAIR circuit CHS11 (VT/GN). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to O7.
O7 CHECK CIRCUIT CHS11 (VT/GN) FOR AN OPEN OR SHORT TO GROUND
Key in OFF position. For MKZ, measure the resistance between driver seat cushion heater C3298-2, circuit CHS11 (VT/GN), harness side and ground; and between C3298-2, circuit CHS11 (VT/GN), harness side and driver seat backrest heater C365-1, circuit CHS11 (VT/GN) harness side. For Fusion and Milan, measure the resistance between driver seat cushion heater C364-2, circuit CHS11 (VT/GN), harness side and ground; and between C364-2, circuit CHS11 (VT/GN), harness side and driver seat backrest heater C365-1, circuit CHS11 (VT/GN) harness side. Is the resistance greater than 10,000 ohms between the driver seat cushion heater and ground and less than 5 ohms between the driver seat cushion heater and driver seat backrest heater?	Yes GO to O8. No REPAIR circuit CHS11 (VT/GN). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O8 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
Measure the resistance between driver seat backrest heater C365-2, circuit GD126 (BK/WH), harness side and ground. Is the resistance less than 5 ohms?	Yes GO to O9. No REPAIR circuit GD126 (BK/WH). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O9 CHECK CUSHION HEATER FOR SHORT TO GROUND OR AN OPEN
For MKZ, measure the resistance between driver seat cushion heater C3298 pin 1, circuit CHS02 (YE/BU), component side and C3298 pin 2, circuit CHS11 (VT/GN), component side; and between C3298 pin 1, circuit CHS02 (YE/BU), component side and ground. For Fusion and Milan, measure the resistance between driver seat cushion heater C364 pin 1, circuit CHS02 (YE/BU), component side and C364 pin 2, circuit CHS11 (VT/GN), component side; and between C364 pin 1, circuit CHS02 (YE/BU), component side and ground. Is the resistance greater than 1.6 ohms and less than 10 ohms between driver seat cushion heater pin 1 and pin 2; and greater than 10,000 ohms between driver seat cushion heater pin 1 and ground?	Yes GO to O10. No INSTALL a new driver seat cushion heater. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O10 CHECK THE SEAT BACKREST HEATER
Measure the resistance between driver seat backrest heater C365 pin 1, circuit CHS11 (VT/GN), component side and C365 pin 2, circuit GD126 (BK/WH), component side. Is the resistance between 0.6 and 0.9 ohm?	Yes GO to O11. No INSTALL a new driver seat backrest heater. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O11 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR A SHORT TO VOLTAGE
Key in ON position. Measure the voltage between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground and between C3304-10, circuit VHS26 (VT), harness side and ground. Is voltage present on either circuit?	Yes REPAIR the affected circuit RHS05 (YE/VT) or VHS26 (VT). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to O12.
O12 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN OR SHORT TO GROUND
Key in OFF position. Measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and C3304-10, circuit VHS26 (VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground. Is the resistance less than 300,000 ohms and greater than 50 ohms between heated seat module pin 13 and pin 10 and greater than 10,000 ohms between heated seat module pin 13 and ground?	Yes GO to O15. No GO to O13.
O13 CHECK CIRCUIT RHS05 (YE/VT) FOR AN OPEN OR SHORT TO GROUND
For MKZ, measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and the driver seat cushion heater C3298-4, circuit RHS05 (YE/VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground. For Fusion and Milan, measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and the driver seat cushion heater C364-4, circuit RHS05 (YE/VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground. Is the resistance less than 5 ohms between the heated seat module and the driver seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?	Yes GO to O14. No REPAIR circuit RHS05 (YE/VT). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O14 CHECK CIRCUIT VHS26 (VT) FOR AN OPEN OR SHORT TO GROUND
For MKZ, measure the resistance between heated seat module C3304-10, circuit VHS26 (VT), harness side and driver seat cushion heater C3298-3, circuit VHS26 (VT), harness side; and between heated seat module C3304-10, circuit VHS26 (VT), harness side and ground. For Fusion and Milan, measure the resistance between heated seat module C3304-10, circuit VHS26 (VT), harness side and driver seat cushion heater C364-3, circuit VHS26 (VT), harness side; and between heated seat module C3304-10, circuit VHS26 (VT), harness side and ground. Is the resistance less than 5 ohms between the heated seat module and the driver seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?	Yes INSTALL a new driver seat cushion heater. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REPAIR circuit VHS26 (VT). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O15 CHECK CIRCUIT CHS29 (WH/BU) FOR A SHORT TO VOLTAGE
Key in OFF position. Disconnect: EATC Module C2356b (MKZ) or C228b (Fusion and Milan). Key in ON position. Measure the voltage between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and ground. Is the voltage less than 0.2 volt?	Yes GO to O16. No REPAIR circuit CHS29 (WH/BU). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O16 CHECK CIRCUIT CHS29 (WH/BU) FOR A SHORT TO GROUND
Key in OFF position. Measure the resistance between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and ground. Is the resistance greater than 10,000 ohms?	Yes GO to O17. No REPAIR circuit CHS29 (WH/BU). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O17 CHECK CIRCUIT CHS29 (WH/BU) FOR AN OPEN
For MKZ, measure the resistance between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and EATC module C2356b-6, circuit CHS29 (WH/BU), harness side. For Fusion and Milan, measure the resistance between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and EATC module C228b-7, circuit CHS29 (WH/BU), harness side. Is the resistance less than 5 ohms?	Yes GO to O18. No REPAIR circuit CHS29 (WH/BU). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
O18 CHECK THE EATC MODULE OUTPUT
Connect: EATC Module C2356b (MKZ) or C228b (Fusion and Milan). Connect: Heated Seat Module C3304. Key in ON position. NOTE: The following measurement must be taken by back-probing the heated seat module C3304. NOTE: The voltage on circuit CHS29 (WH/BU) should drop momentarily when the driver heated seat control button is pressed. Measure the voltage between heated seat module C3304-12, circuit CHS29 (WH/BU), harness side and ground by back-probing heated seat module connector. Press the driver heated seat control button on the EATC module and note the voltage. Is the voltage greater than 10 volts before pressing the driver heated seat control button, then momentarily drops when the heated seat control button is pressed?	Yes INSTALL a new heated seat module. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No If the voltage is greater than 10 volts but did not drop when the driver heated seat button was pressed, INSTALL a new EATC module. REFER to Section 412-01. TEST the system for normal operation. If the voltage is less than 10 volts, INSTALL a new heated seat module. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test P: The Heated Seat Is Inoperative — Passenger

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

The heated seat module receives ignition voltage feed on circuit CBP19 (BN/WH), battery voltage feed on circuit SBB11 (BU/RD) and is supplied ground on circuit GD139 (BK/YE). When ignition switched power is supplied and the passenger heated seat button on the electronic automatic temperature control (EATC) module is pressed, a momentary ground signal is sent to the heated seat module on circuit CHS30 (GN/YE) to command the system ON or OFF. Upon receiving a signal, the heated seat module will decrease one setting (the sequence is HI, LO, OFF, HI, etc.). The heated seat module supplies voltage to the cushion and backrest heater mats on circuit CHS07 (GY/BU). Ground to the heater mats is provided on circuit GD139 (BK/YE). The cushion and backrest heater mats are connected in series and operate together. Temperature is maintained by the heated seat module using a sensor contained within the cushion heater mat. The heated seat module supplies a reference voltage to the temperature sensor on circuit RHS05 (YE/VT) and monitors the signal from the temperature sensor on circuit VHS27 (WH/OG) for controlling current flow to the heater mats. The heated seat module is designed to remain ON, heating the seat and maintaining temperature until switched OFF or a 15-minute time-out period occurs.

Possible Causes

An inoperative passenger heated seat can be caused by:

an open fuse.
faulty wiring, terminals or connectors.
a faulty heater mat.
a faulty heated seat module.
a faulty EATC module.

PINPOINT TEST P: THE HEATED SEAT IS INOPERATIVE — PASSENGER

Test Step	Result / Action to Take
P1 CHECK CIRCUIT SBB11 (BU/RD) FOR VOLTAGE TO THE HEATED SEAT MODULE
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the passenger seat side air bag C313. Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313. Connect the battery ground cable. Disconnect: Heated Seat Module C3304. Measure the voltage between heated seat module C3304-1, circuit SBB11 (BU/RD) harness side and ground and C3304-17, circuit SBB11 (BU/RD) harness side and ground. Is the voltages greater than 10 volts?	Yes GO to P2. No VERIFY battery junction box (BJB) fuse 11 (20A Fusion and Milan) (30A MKZ) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P2 CHECK CIRCUIT CBP19 (BN/WH) FOR VOLTAGE TO THE HEATED SEAT MODULE
Key in ON position. Measure the voltage between heated seat module C3304-2, circuit CBP19 (BN/WH), harness side and ground. Is the voltage greater than 10 volts?	Yes GO to P3. No VERIFY smart junction box (SJB) fuse 28 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P3 CHECK HEATED SEAT MODULE GROUND CIRCUIT GD139 (BK/YE)
Key in OFF position. Measure the resistance between heated seat module C3304-7, circuit GD139 (BK/YE), harness side and ground. Is the resistance less than 5 ohms?	Yes GO to P4. No REPAIR circuit GD139 (BK/YE). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P4 CHECK CIRCUIT CHS07 (GY/BU) FOR SHORT TO VOLTAGE
Disconnect: Passenger Seat Cushion Heater C334/C3320. Key in ON position. For MKZ, measure the voltage between passenger seat cushion heater C3320-1, circuit CHS07 (GY/BU), harness side and ground. For Fusion and Milan, measure the voltage between passenger seat cushion heater C334-1, circuit CHS07 (GY/BU), harness side and ground. Is voltage present on the circuit?	Yes REPAIR circuit CHS07 (GY/BU). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to P5.
P5 CHECK CIRCUIT CHS07 (GY/BU) FOR AN OPEN OR SHORT TO GROUND
Key in OFF position. For MKZ, measure the resistance between passenger seat cushion heater C3320-1, circuit CHS07 (GY/BU), harness side and ground; and between C3320-1, circuit CHS07 (GY/BU), harness side and heated seat module C3304-8, circuit CHS07 (GY/BU) harness side. For Fusion and Milan, measure the resistance between passenger seat cushion heater C334-1, circuit CHS07 (GY/BU), harness side and ground; and between C334-1, circuit CHS07 (GY/BU), harness side and heated seat module C3304-8, circuit CHS07 (GY/BU) harness side. Is the resistance greater than 10,000 ohms between the passenger seat cushion heater and ground and less than 5 ohms between the passenger seat cushion heater and the heated seat module?	Yes GO to P6. No REPAIR circuit CHS07 (GY/BU). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P6 CHECK CIRCUIT CHS12 (YE/GN) FOR SHORT TO VOLTAGE
Disconnect: Passenger Seat Backrest Heater C335. Key in ON position. For MKZ, measure the voltage between passenger seat cushion heater C3320-2, circuit CHS12 (YE/GN), harness side and ground. For Fusion and Milan, measure the voltage between passenger seat cushion heater C334-2, circuit CHS12 (YE/GN), harness side and ground. Is voltage present on the circuit?	Yes REPAIR circuit CHS12 (YE/GN). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to P7.
P7 CHECK CIRCUIT CHS12 (YE/GN) FOR AN OPEN OR SHORT TO GROUND
Key in OFF position. For MKZ, measure the resistance between passenger seat cushion heater C3320-2, circuit CHS12 (YE/GN), harness side and ground; and between C3320-2, circuit CHS12 (YE/GN), harness side and passenger seat backrest heater C335-1, circuit CHS12 (YE/GN) harness side. For Fusion and Milan, measure the resistance between passenger seat cushion heater C334-2, circuit CHS12 (YE/GN), harness side and ground; and between C334-2, circuit CHS12 (YE/GN), harness side and passenger seat backrest heater C335-1, circuit CHS12 (YE/GN) harness side. Is the resistance greater than 10,000 ohms between the passenger seat cushion heater and ground and less than 5 ohms between the passenger seat cushion heater and passenger seat backrest heater?	Yes GO to P8. No REPAIR circuit CHS12 (YE/GN). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P8 CHECK CIRCUIT GD139 (BK/YE) FOR AN OPEN
Measure the resistance between passenger seat backrest heater C335-2, circuit GD139 (BK/YE), harness side and ground. Is the resistance less than 5 ohms?	Yes GO to P9. No REPAIR circuit GD139 (BK/YE). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P9 CHECK CUSHION HEATER FOR SHORT TO GROUND OR AN OPEN
For MKZ, measure the resistance between passenger cushion heater C3320 pin 1, circuit CHS07 (GY/BU), component side and C3320 pin 2, circuit CHS12 (YE/GN), component side; and between C334 pin 1, circuit CHS07 (GY/BU), component side and ground. For Fusion and Milan, measure the resistance between passenger seat cushion heater C334 pin 1, circuit CHS07 (GY/BU), component side and C334 pin 2, circuit CHS12 (YE/GN), component side; and between C334 pin 1, circuit CHS07 (GY/BU), component side and ground. Is the resistance greater than 1.6 ohms and less than 10 ohms between the passenger seat cushion heater pin 1 and pin 2 and greater than 10,000 ohms between the passenger seat cushion heater pin 1 and ground?	Yes GO to P10. No INSTALL a new passenger seat cushion heater. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P10 CHECK THE SEAT BACKREST HEATER
Measure the resistance between passenger seat backrest heater C335 pin 1, circuit CHS12 (YE/GN), component side and C335 pin 2, circuit GD139 (BK/YE), component side. Is the resistance between 0.6 and 0.9 ohm?	Yes GO to P11. No INSTALL a new driver seat backrest heater. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P11 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR A SHORT TO VOLTAGE
Key in ON position. Measure the voltage between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground and between C3304-16, circuit VHS27 (WH/OG), harness side and ground. Is voltage present on either circuit?	Yes REPAIR the affected circuit RHS05 (YE/VT) or VHS27 (WH/OG). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to P12.
P12 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR AN OPEN OR SHORT TO GROUND
Key in OFF position. Measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and C3304-16, circuit VHS27 (WH/OG), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground. Is the resistance less than 300,000 ohms and greater than 50 ohms between heated seat module pin 13 and pin 16 and greater than 10,000 ohms between heated seat module pin 13 and ground?	Yes GO to P15. No GO to P13.
P13 CHECK CIRCUIT RHS05 (YE/VT) FOR AN OPEN OR SHORT TO GROUND
For MKZ, measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and the passenger seat cushion heater C3320-4, circuit RHS05 (YE/VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground. For Fusion and Milan, measure the resistance between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and the passenger seat cushion heater C334-4, circuit RHS05 (YE/VT), harness side; and between heated seat module C3304-13, circuit RHS05 (YE/VT), harness side and ground. Is the resistance less than 5 ohms between the heated seat module and passenger seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?	Yes GO to P14. No REPAIR circuit RHS05 (YE/VT). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P14 CHECK CIRCUIT VHS27 (WH/OG) FOR AN OPEN OR SHORT TO GROUND
For MKZ, measure the resistance between heated seat module C3304-16, circuit VHS27 (WH/OG), harness side and passenger seat cushion heater C3320-3, circuit VHS27 (WH/OG), harness side; and between heated seat module C3304-16, circuit VHS27 (WH/OG), harness side and ground. For Fusion and Milan, measure the resistance between heated seat module C3304-16, circuit VHS27 (WH/OG), harness side and passenger seat cushion heater C334-3, circuit VHS27 (WH/OG), harness side; and between heated seat module C3304-16, circuit VHS27 (WH/OG), harness side and ground. Is the resistance less than 5 ohms between the heated seat module and passenger seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?	Yes INSTALL a new passenger seat cushion heater. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REPAIR circuit VHS27 (WH/OG). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P15 CHECK CIRCUIT CHS30 (GY/YE) FOR A SHORT TO VOLTAGE
Key in OFF position. Disconnect: EATC Module C2356b (MKZ) or C228b (Fusion and Milan). Key in ON position. Measure the voltage between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and ground. Is the voltage less than 0.2 volt?	Yes GO to P16. No REPAIR circuit CHS30 (GY/YE). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P16 CHECK CIRCUIT CHS30 (GY/YE) FOR A SHORT TO GROUND
Key in OFF position. Measure the resistance between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and ground. Is the resistance greater than 10,000 ohms?	Yes GO to P17. No REPAIR circuit CHS30 (GY/YE). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P17 CHECK CIRCUIT CHS30 (GY/YE) FOR AN OPEN
For MKZ, measure the resistance between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and EATC module C2356b-19, circuit CHS30 (GY/YE), harness side. For Fusion and Milan, measure the resistance between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and EATC module C228b-8, circuit CHS30 (GY/YE), harness side. Is the resistance less than 5 ohms?	Yes GO to P18. No REPAIR circuit CHS30 (GY/YE). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
P18 CHECK THE EATC MODULE OUTPUT
Connect: EATC Module C2356b (MKZ) or C228b (Fusion and Milan). Connect: Heated Seat Module C3304. Key in ON position. NOTE: The following measurement must be taken by back-probing the heated seat module C3304. NOTE: The voltage on circuit CHS30 (GY/YE) should drop momentarily when the passenger heated seat control button is pressed. Measure the voltage between passenger heated seat module C3304-15, circuit CHS30 (GY/YE), harness side and ground by back-probing heated seat module connector. Press the passenger heated seat control button on the EATC module and note the voltage. Is the voltage greater than 10 volts before pressing the passenger heated seat control button, then momentarily drops when the heated seat control button is pressed?	Yes INSTALL a new heated seat module. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No If the voltage is greater than 10 volts but did not drop when the passenger heated seat button was pressed, INSTALL a new EATC module. REFER to Section 412-01. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. If the voltage is less than 10 volts, INSTALL a new heated seat module. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test Q: The Heated Seat Is Inoperative — Driver Seat Does Heat But The Heated Seat Indicator Does Not Illuminate When Pressed

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Upon receiving a signal from the electronic automatic temperature control (EATC) module, the heated seat module will decrease one setting (the sequence is HI, LO, OFF, HI, etc.). When the driver heated seat is set to HI, both LED indicators above the driver heated seat control button will illuminate. When the driver heated seat is set to LO, only the left LED on the driver heated seat indicator will illuminate. When the driver heated seat is set to OFF, neither driver heated seat LED will illuminate.

Possible Causes

An inoperative heated seat indicator can be caused by:

wiring, terminals or connectors.
a faulty heated seat module.
a faulty EATC module.

PINPOINT TEST Q: THE HEATED SEAT IS INOPERATIVE — DRIVER SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE WHEN PRESSED

Test Step	Result / Action to Take
Q1 CHECK CIRCUITS CHS04 (YE/GY) AND CHS13 (VT/BN) FOR A SHORT TO GROUND
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag module C327. Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327. Disconnect the passenger seat side air bag module C313. Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. Connect the battery ground cable. Disconnect: EATC Module C2356b (MKZ) or C228b (Fusion and Milan). Disconnect: Heated Seat Module C3304. For MKZ, measure the resistance between EATC module C2356b-7, circuit CHS04 (YE/GY), harness side and ground; and between EATC module C2356b-8, circuit CHS13 (VT/BN), harness side and ground. For Fusion and Milan, measure the resistance between EATC module C228b-11, circuit CHS04 (YE/GY), harness side and ground; and between EATC module C228b-9, circuit CHS13 (VT/BN), harness side and ground. Are the resistances greater than 10,000 ohms?	Yes GO to Q2. No REPAIR the affected circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
Q2 CHECK CIRCUITS CHS04 (YE/GY) AND CHS13 (VT/BN) FOR AN OPEN
Key in ON position. For MKZ, measure the resistance between EATC module C2356b-7, circuit CHS04 (YE/GY), harness side and heated seat module C3304-5, circuit CHS04 (YE/GY), harness side; and between EATC module C2356b-8, circuit CHS13 (VT/BN), harness side and heated seat module C3304-4, circuit CHS13 (VT/BN), harness side. For Fusion and Milan, measure the resistance between EATC module C228b-11, circuit CHS04 (YE/GY), harness side and heated seat module C3304-5, circuit CHS04 (YE/GY), harness side; and between EATC module C228b-9, circuit CHS13 (VT/BN), harness side and heated seat module C3304-4, circuit CHS13 (VT/BN), harness side. Are the resistances less than 5 ohms?	Yes GO to Q3. No REPAIR the affected circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
Q3 CHECK THE HEATED SEAT MODULE HI INDICATOR ON THE EATC MODULE
Connect: EATC Module C2356b (MKZ) or C228b (Fusion and Milan). Key in ON position. Connect a fused jumper lead between heated seat module C3304-4, circuit CHS13 (VT/BN), harness side and C3304-1, circuit SBB11 (BU/RD), harness side. Do both driver heated seat indicator LEDs illuminate on the EATC module?	Yes GO to Q4. No INSTALL a new EATC module. REFER to Section 412-01. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
Q4 CHECK THE HEATED SEAT MODULE LOW INDICATOR ON THE EATC MODULE
Connect a fused jumper lead between heated seat module C3304-5, circuit CHS04 (YE/GY), harness side and C3304-1, circuit SBB11 (BU/RD), harness side. Does only the left driver heated seat indicator LED illuminate on the EATC module?	Yes INSTALL a new heated seat module. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No INSTALL a new EATC module. REFER to Section 412-01. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test R: The Heated Seat Is Inoperative — Passenger Seat Does Heat But The Heated Seat Indicator Does Not Illuminate When Pressed

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Upon receiving a signal from the electronic automatic temperature control (EATC) module, the heated seat module will decrease one setting (the sequence is HI, LO, OFF, HI, etc.). When the passenger heated seat is set to HI, both LED indicators above the passenger heated seat control button will illuminate. When the passenger heated seat is set to LO, only the left LED on the passenger heated seat indicator will illuminate. When the passenger heated seat is set to OFF, neither passenger heated seat LED will illuminate.

Possible Causes

An inoperative heated seat indicator can be caused by:

wiring, terminals or connectors.
a faulty heated seat module.
a faulty EATC module.

PINPOINT TEST R: THE HEATED SEAT IS INOPERATIVE — PASSENGER SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE WHEN PRESSED

Test Step	Result / Action to Take
R1 CHECK CIRCUITS CHS09 (GY) AND CHS14 (GN) FOR A SHORT TO GROUND
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the passenger seat side air bag C313. Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313. Connect the battery ground cable. Disconnect: EATC Module C2356b (MKZ) or C228b (Fusion and Milan). Disconnect: Heated Seat Module C3304. For MKZ, measure the resistance between EATC module C2356b-20, circuit CHS09 (GY), harness side and ground; and between EATC module C2356b-21, circuit CHS14 (GN), harness side and ground. For Fusion and Milan, measure the resistance between EATC module C228b-5, circuit CHS09 (GY), harness side and ground; and between EATC module C228b-16, circuit CHS14 (GN), harness side and ground. Are the resistances greater than 10,000 ohms?	Yes GO to R2. No REPAIR the affected circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
R2 CHECK CIRCUITS CHS09 (GY) AND CHS14 (GN) FOR AN OPEN
Key in ON position. Measure the resistance between EATC module C2356b-20, circuit CHS09 (GY), harness side and heated seat module C3304-3, circuit CHS09 (GY), harness side; and between EATC module C2356b-21, circuit CHS14 (GN), harness side and heated seat module C3304-6, circuit CHS14 (GN), harness side. Measure the resistance between EATC module C228b-5, circuit CHS09 (GY), harness side and heated seat module C3304-3, circuit CHS09 (GY), harness side; and between EATC module C228b-16, circuit CHS14 (GN), harness side and heated seat module C3304-6, circuit CHS14 (GN), harness side. Are the resistances less than 5 ohms?	Yes GO to R3. No REPAIR the affected circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
R3 CHECK THE HEATED SEAT MODULE HI INDICATOR ON THE EATC MODULE
Connect: EATC Module C2356b (MKZ) or C228b (Fusion and Milan). Key in ON position. Connect a fused jumper lead between heated seat module C3304-6, circuit CHS14 (GN), harness side and C3304-1, circuit SBB11 (BU/RD), harness side. Do both passenger heated seat indicator LEDs illuminate on the EATC module?	Yes GO to R4. No INSTALL a new EATC module. REFER to Section 412-01. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
R4 CHECK THE HEATED SEAT MODULE LOW INDICATOR ON THE EATC MODULE
Connect a fused jumper lead between passenger heated seat module C3304-3, circuit CHS09 (GY), harness side and C3304-1, circuit SBB11 (BU/RD), harness side. Does only the left passenger heated seat indicator LED illuminate on the EATC module?	Yes INSTALL a new heated seat module. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No INSTALL a new EATC module. REFER to Section 412-01. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test S: DTC B103B/B1111 — Thermoelectric Driver Overcurrent Low/Driver Thermoelectric Device Control Overtemperature Fault

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Both the driver and front passenger climate controlled seats are independently controlled electronically by the dual climate controlled seat module (DCSM) mounted to the bottom of the passenger seat cushion. The climate controlled seat system only operates with the engine running, however, if using a scan tool to command the DCSM, diagnostic testing can be carried out with the ignition switch key ON engine OFF (KOEO). The system receives power from battery junction box (BJB) fuse 12 (30A) feeding battery voltage on circuit SBB12 (GN/RD) into DCSM C3305a pin F. The system also receives power from BJB fuse 11 (30A) feeding battery voltage on circuit SBB11 (BU/RD) into DCSM C3305a pin E. If power is disconnected from either pin E or F of DCSM C3305a with the power connection remaining on the other circuit, both seats will remain operational because the power feed circuits are connected internally in the DCSM. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the module and the other will remain operational.

Possible Causes

A TED driver overcurrent low or device control overtemperature fault can be caused by:

wiring, terminals or connectors.
a faulted TED assembly.
a faulted DCSM.

PINPOINT TEST S: DTC B103B/B1111 — THERMOELECTRIC DRIVER OVERCURRENT LOW/DRIVER THERMOELECTRIC DEVICE CONTROL OVERTEMPERATURE FAULT

Test Step

Result / Action to Take

S1 CHECK THE TED CIRCUITS FOR SHORT TO GROUND

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the driver seat side air bag module C327.

Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327.

Disconnect the passenger seat side air bag module C313.

Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313.

Connect the battery ground cable.

Disconnect: DCSM C3305a.
Measure the resistance between the following DCSM C3305a pins, harness side and ground.

Connector-Pin	Circuit
C3305a-G	CHS02 (YE/BU)
C3305a-H	RHS02 (BU/OG)
C3305a-J	CHS01 (GY/VT)
C3305a-K	RHS01 (WH/VT)

Are the resistances greater than 10,000 ohms?

Yes
GO to S2.

No
If the resistances of C3305a-G, circuit CHS02 (YE/BU) and/or C3305a-H, circuit RHS02 (BU/OG) to ground were not greater than 10,000 ohms to ground, GO to S6 .

If resistances of C3305a-J, circuit CHS01 (GY/VT) and/or C3305a-K, circuit RHS01 (WH/VT) to ground were not greater than 10,000 ohms to ground, GO to S7 .

S2 CHECK THE TED CIRCUITS FOR SHORT TO VOLTAGE

Key in ON position.
Measure the voltage between the following DCSM C3305a pins, harness side and ground.

Connector-Pin	Circuit
C3305a-G	CHS02 (YE/BU)
C3305a-H	RHS02 (BU/OG)
C3305a-J	CHS01 (GY/VT)
C3305a-K	RHS01 (WH/VT)

Are the voltages less than 1 volt?

No
GO to S3.

No
If the voltages measured at C3305a-G and/or C3305a-H were not less than 1 volt, GO to S8 .

If voltages measured at C3305a-J and/or C3305a-K were not less than 1 volt, GO to S9 .

S3 CHECK THE TED RESISTANCE

Key in OFF position.
CAUTION: Make sure the TEDs are at room temperature and there is no air blowing across the TEDs. Do not handle a TED when measuring resistance. These conditions can cause incorrect readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305a-G, circuit CHS02 (YE/BU), harness side and DCSM C3305a-H, circuit RHS02 (BU/OG), harness side; and between DCSM C3305a-J, circuit CHS01 (GY/VT), harness side and C3305a-K, circuit RHS01 (WH/VT), harness die and ground.

Yes INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REF

Are the resistances between 0.9 and 10 ohms?

S4 CHECK THE RESISTANCE OF THE BACKREST TED

Disconnect: Backrest TED C3310.
Measure the resistance between backrest TED C3310 pin 1 and pin 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

S5 CHECK THE RESISTANCE OF THE CUSHION TED

Disconnect: Cushion TED C3300.
Measure the resistance between cushion TED C3300 pin 1 and pin 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

S6 CHECK THE CUSHION TED CIRCUITS FOR SHORT TO GROUND

Disconnect: Cushion TED C3300.
Measure the resistance between DCSM C3305a-G, circuit CHS02 (YE/BU), harness side and ground and between C3305a-H, circuit RHS02 (BU/OG), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

S7 CHECK THE BACKREST TED CIRCUITS FOR SHORT TO GROUND

Disconnect: Backrest TED C3310.
Measure the resistance between DCSM C3305a-J, circuit CHS01 (GY/VT), harness side and ground and between C3305a-K, circuit RHS01 (WH/VT), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

S8 CHECK THE CUSHION TED CIRCUITS FOR SHORT TO VOLTAGE

Key in OFF position.
Disconnect: Cushion TED C3300.
Key in ON position.
Measure the voltage between DCSM C3305a-G, circuit CHS02 (YE/BU), harness side and ground and between C3305a-H, circuit RHS02 (BU/OG), harness side and ground.

Are the voltages less than 1 volt?

S9 CHECK THE BACKREST TED CIRCUITS FOR SHORT TO VOLTAGE

Key in OFF position.
Disconnect: Backrest TED C3310.
Key in ON position.
Measure the voltage between DCSM C3305a-J, circuit CHS01 (GY/VT), harness side and ground and between C3305a-K, circuit RHS01 (WH/VT), harness side and ground.

Are the voltages less than 1 volt?

Pinpoint Test T: DTC B103C — Thermoelectric Driver Open Load

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A TED driver open load fault can be caused by:

wiring, terminals or connectors.
a faulted TED assembly.
a faulted DCSM.

PINPOINT TEST T: DTC B103C — THERMOELECTRIC DRIVER OPEN LOAD

Test Step

Result / Action to Take

T1 CHECK THE TED CIRCUITS FOR AN OPEN

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the driver seat side air bag module C327.

Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327.

Disconnect the passenger seat side air bag module C313.

Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313.

Connect the battery ground cable.

Disconnect: DCSM C3305a.
Disconnect: Cushion TED C3300.
Disconnect: Backrest TED C3310.
Measure the resistance of the following circuits.

DCSM Connector-Pin	Circuit	TED Connector-Pin
C3305a-G	CHS02 (YE/BU)	C3300-1
C3305a-H	RHS02 (BU/OG)	C3300-3
C3305a-J	CHS01 (GY/VT)	C3310-1
C3305a-K	RHS01 (WH/VT) (VT/BK)	C3310-3

Are the resistances less than 5 ohms?

Yes
GO to T2.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

T2 CHECK THE TED CIRCUITS FOR SHORT TO VOLTAGE

Key in ON position.
Measure the voltage between the following DCSM C3305a pins, harness side and ground.

Connector-Pin	Circuit
C3305a-G	CHS02 (YE/BU)
C3305a-H	RHS02 (BU/OG)
C3305a-J	CHS01 (GY/VT)
C3305a-K	RHS01 (WH/VT)

Is voltage present on any circuit?

T3 CHECK RESISTANCE OF THE TEDS

Key in OFF position.
Measure the resistance between backrest TED C3310 pin 1 and pin 3, component side and between cushion TED C3310 pin 1 and pin 3, component side.

Are the resistances between 0.9 and 10 ohms?

Yes
INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
If the resistance of the backrest TED was not between 0.9 and 10 ohms, INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If the resistance of the cushion TED was not between 0.9 and 10 ohms, INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test U: DTC B103D — Blower Driver Overtemperature

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A blower overtemperature fault can be caused by:

wiring, terminals or connectors.
a faulted TED assembly.
a faulted DCSM.

PINPOINT TEST U: DTC B103D — BLOWER DRIVER OVERTEMPERATURE

Test Step	Result / Action to Take
U1 CHECK THE BLOWER CIRCUIT FOR AN OPEN
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag module C327. Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327. Disconnect the passenger seat side air bag module C313. Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. Connect the battery ground cable. Disconnect: DCSM C3305c. Disconnect: Cushion TED C3300. Disconnect: Backrest TED C3310. Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground. Is the resistance greater than 10,000 ohms?	Yes GO to U2. No REPAIR the affected circuit. REPEAT the self-test. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
U2 CHECK THE BLOWER CIRCUITS FOR A SHORT
Measure the resistance between DCSM C3305c-15, circuit RHS03 (GY/OG), harness side and C3305c-16, circuit CHS03 (GN/BN), harness side. Is the resistance greater than 10,000 ohms?	Yes GO to U3. No REPAIR the affected circuits. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
U3 CHECK THE BLOWER RESISTANCE
CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty. Measure the resistance between cushion TED C3300 pin 2 and pin 4, component side and between backrest TED C3310 pin 2 and pin 4, component side. Are the resistances between 6 Kohms and 9 Kohms?	Yes INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. REPEAT the self-test. CLEAR the DTCs. No If the resistance of the cushion TED was not between 6,000 and 9,000 ohms, INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs. If the resistance of the backrest TED was not between 6,000 and 9,000 ohms, INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test V: DTC B1113/B111B — Passenger Thermoelectric Device Control Overtemperature Fault/Passenger Thermoelectric Driver Overcurrent Low

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A TED device control overtemperature or overcurrent low fault can be caused by:

wiring, terminals or connectors.
a faulted TED assembly.
a faulted DCSM.

PINPOINT TEST V: DTC B1113/B111B — PASSENGER THERMOELECTRIC DEVICE CONTROL OVERTEMPERATURE FAULT/PASSENGER THERMOELECTRIC DRIVER OVERCURRENT LOW

Test Step

Result / Action to Take

V1 CHECK THE TED CIRCUITS FOR SHORT TO GROUND

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the passenger seat side air bag C313.

Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313.

Connect the battery ground cable.

Disconnect: DCSM C3305a.
Measure the resistance between the following DCSM C3305a pins, harness side and ground.

Connector-Pin	Circuit
C3305a-A	CHS07 (GY/BU)
C3305a-B	RHS07 (BU)
C3305a-C	CHS06 (BU/BN)
C3305a-D	RHS06 (WH)

Are the resistances greater than 10,000 ohms?

Yes
GO to V2.

No
If the resistances of C3305a-A and/or C3305a-B to ground were not greater than 10,000 ohms to ground, GO to V6 .

If resistances of C3305a-C and/or C3305a-D to ground were not greater than 10,000 ohms to ground, GO to V7 .

V2 CHECK THE TED CIRCUITS FOR SHORT TO VOLTAGE

Key in ON position.
Measure the voltage between the following DCSM C3305a pins, harness side and ground.

Connector-Pin	Circuit
C3305a-A	CHS07 (GY/BU)
C3305a-B	RHS07 (BU)
C3305a-C	CHS06 (BU/BN)
C3305a-D	RHS06 (WH)

Are the voltages less than 1 volt?

Yes
GO to V3.

No
If the voltages measured at C3305a-A and/or C3305a-B were not less than 1 volt, GO to V8 .

If voltages measured at C3305a-C and/or C3305a-D were not less than 1 volt, GO to V9 .

V3 CHECK THE TED RESISTANCE

Key in OFF position.
CAUTION: Make sure the TEDs are at room temperature and there is no air blowing across the TEDs. Do not handle a TED when measuring resistance. These conditions can cause incorrect readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305a-A, circuit CHS07 (GY/BU), harness side and DCSM C3305a-B, circuit RHS07 (BU), harness side; and between DCSM C3305a-C, circuit CHS06 (BU/BN), harness side and C3305a-D, circuit RHS06 (WH), harness die and ground.

Are the resistances between 0.9 and 10 ohms?

V4 CHECK THE RESISTANCE OF THE BACKREST TED

Disconnect: Backrest TED C3311.
Measure the resistance between backrest TED C3311 pin 1 and pin 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

V5 CHECK THE RESISTANCE OF THE CUSHION TED

Disconnect: Cushion TED C3303.
Measure the resistance between cushion TED C3303 pin 1 and pin 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

V6 CHECK THE CUSHION TED CIRCUITS FOR SHORT TO GROUND

Disconnect: Cushion TED C3303.
Measure the resistance between DCSM C3305a-A, circuit CHS07 (GY/BU), harness side and ground and between C3305a-B, circuit RHS07 (BU), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

V7 CHECK THE BACKREST TED CIRCUITS FOR SHORT TO GROUND

Disconnect: Backrest TED C3311.
Measure the resistance between DCSM C3305a-C, circuit CHS06 (BU/BN), harness side and ground and between C3305a-D, circuit RHS06 (WH), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

V8 CHECK THE CUSHION TED CIRCUITS FOR SHORT TO VOLTAGE

Key in OFF position.
Disconnect: Cushion TED C3303.
Key in ON position.
Measure the voltage between DCSM C3305a-A, circuit CHS07 (GY/BU), harness side and ground and between C3305a-B, circuit RHS07 (BU), harness side and ground.

Are the voltages less than 1 volt?

Yes
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

V9 CHECK THE BACKREST TED CIRCUITS FOR SHORT TO VOLTAGE

Key in OFF position.
Disconnect: Backrest TED C3311.
Key in ON position.
Measure the voltage between DCSM C3305a-C, circuit CHS06 (BU/BN), harness side and ground and between C3305a-D, circuit RHS06 (WH), harness side and ground.

Are the voltages less than 1 volt?

Yes
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test W: DTC B111C — Passenger Thermoelectric Driver Open Load

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A TED driver open load fault can be caused by:

wiring, terminals or connectors.
a faulted TED assembly.
a faulted DCSM.

PINPOINT TEST W: DTC B111C — PASSENGER THERMOELECTRIC DRIVER OPEN LOAD

Test Step

Result / Action to Take

W1 CHECK THE TED CIRCUITS FOR AN OPEN

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the passenger seat side air bag C313.

Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313.

Connect the battery ground cable.

Disconnect: DCSM C3305a.
Disconnect: Cushion TED C3303.
Disconnect: Backrest TED C3311.
Measure the resistance of the following circuits.

DCSM Connector-Pin	Circuit	TED Connector-Pin
C3305a-A	CHS07 (GY/BU)	C3303-1
C3305a-B	RHS07 (BU)	C3303-3
C3305a-C	CHS06 (BU/BN)	C3311-1
C3305a-D	RHS06 (WH) (GN/BK)	C3311-3

Are the resistances less than 5 ohms?

Yes
GO to W2.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

W2 CHECK THE TED CIRCUITS FOR SHORT TO VOLTAGE

Key in ON position.
Measure the voltage between the following DCSM C3305a pins, harness side and ground.

Connector-Pin	Circuit
C3305a-A	CHS07 (GY/BU)
C3305a-B	RHS07 (BU)
C3305a-C	CHS06 (BU/BN)
C3305a-D	RHS06 (WH)

Is voltage present on any circuit?

W3 CHECK RESISTANCE OF THE TEDS

Key in OFF position.
Measure the resistance between backrest TED C3311 pin 1 and pin 3, component side and between cushion TED C3311 pin 1 and pin 3, component side.

Are the resistances between 0.9 and 10 ohms?

Yes
INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
If the resistance of the backrest TED was not between 0.9 and 10 ohms, INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If the resistance of the cushion TED was not between 0.9 and 10 ohms, INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test X: DTC B111D — Passenger Blower Driver Overtemperature

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A blower overtemperature fault can be caused by:

wiring, terminals or connectors.
a faulted TED assembly.
a faulted DCSM.

PINPOINT TEST X: DTC B111D — PASSENGER BLOWER DRIVER OVERTEMPERATURE

Test Step	Result / Action to Take
X1 CHECK THE BLOWER CIRCUIT FOR AN OPEN
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles equipped with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the passenger seat side air bag C313. Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313. Connect the battery ground cable. Disconnect: DCSM C3305c. Disconnect: Cushion TED C3303. Disconnect: Backrest TED C3311. Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and ground. Is the resistance greater than 10,000 ohms?	Yes GO to X2. No REPAIR the affected circuit. REPEAT the self-test. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
X2 CHECK THE BLOWER CIRCUITS FOR A SHORT
Measure the resistance between DCSM C3305c-7, circuit RHS08 (VT/WH), harness side and C3305c-8, circuit CHS08 (BN/YE), harness side. Is the resistance greater than 10,000 ohms?	Yes GO to X3. No REPAIR the affected circuits. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
X3 CHECK THE BLOWER RESISTANCE
CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty. Measure the resistance between cushion TED C3303 pin 2 and pin 4, component side and between backrest TED C3311 pin 2 and pin 4, component side. Are the resistances between 6 Kohms and 9 Kohms?	Yes INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. REPEAT the self-test. CLEAR the DTCs. No If the resistance of the cushion TED was not between 6,000 and 9,000 ohms, INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs. If the resistance of the backrest TED was not between 6,000 and 9,000 ohms, INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test Y: DTC B2729 — Driver Cushion Over-Temp Detected

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A driver seat cushion over-temp fault can be caused by:

wiring, terminals or connectors.
restricted cushion TED filter.
crushed or restricted cushion foam pad.
crushed or restricted climate controlled seat manifold.
a faulted cushion TED assembly.
a faulted DCSM.

PINPOINT TEST Y: DTC B2729 — DRIVER CUSHION OVER-TEMP DETECTED

Test Step

Result / Action to Take

Y1 CHECK THE DCSM FOR ON-DEMAND DTCS

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the driver seat side air bag module C327.

Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327.

Disconnect the passenger seat side air bag module C313.

Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313.

Connect the battery ground cable.

Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool: Dual Climate Controlled Seat Module (DCSM) Self Test/Retrieve DTCs.
Was DTC B2729 retrieved during the on-demand self test?

Yes
GO to Y2.

No
GO to Y4.

Y2 CHECK THE TED THERMISTOR CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Disconnect: DCSM C3305b.
Disconnect: Cushion TED C3300.
Measure the resistance between DCSM C3305b-7, circuit VHS26 (VT), harness side and ground and between DCSM C3305b-8, circuit RHS05 (YE/VT), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to Y3.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Y3 CHECK THE TED THERMISTOR

Measure the resistance between cushion TED C3300 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

Yes
REPAIR the affected open circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Y4 CONFIRM THE FAULT

Verify with the customer that the concern is the seat shuts OFF in heat mode.
NOTE: A crushed seat cushion foam pad or a crushed climate controlled seat manifold may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.
Attempt to recreate the fault. Start the vehicle and set the driver seat to high heat for at least 15 minutes.
Is the customer concern with the seat hutting OFF in heat mode or was the fault recreated?

Yes
GO to Y5.

No
Fault not present. Fault may have been set due to a past failure or incorrect use of the climate controlled seat system by repeated switching between HEAT and COOL modes. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Y5 CHECK OPERATION OF THE SEAT

Key in ON position.
With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
Compare the airflow from the driver seat cushion and compare it to the airflow from the passenger seat cushion.
Is the airflow exhausting from the driver seat cushion comparable to the airflow exhausting from the passenger seat cushion?

Yes
GO to Y14.

No
GO to Y6.

Y6 CHECK THE CUSHION BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER

Key in OFF position.
Inspect the blower of the cushion TED assembly for an obstruction or for a restricted filter.
Is the blower obstructed or the filter restricted?

Yes
REMOVE the obstruction or INSTALL a new filter. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
GO to Y7.

Y7 CHECK THE CUSHION FAN OPERATION

Key in ON position.
With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
Inspect the cushion blower for operation.
Does the cushion blower operate?

Yes
GO to Y14.

No
GO to Y8.

Y8 CHECK THE BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN

Key in OFF position.
Disconnect: DCSM C3305c.
Disconnect: Cushion TED C3300.
Measure the resistance between DCSM C3305c-11, circuit VHS18 (BN/GN), harness side and cushion TED C3300-7, circuit VHS18 (BN/GN), harness side.

Is the resistance less than 5 ohms?

Yes
GO to Y9.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Y9 CHECK THE BLOWER- CIRCUIT FOR A SHORT TO VOLTAGE

Key in ON position.
Measure the voltage between DCSM C3305c-15, circuit RHS03 (GY/OG), harness side and ground.

Yes REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs. If equipped with s

Is voltage greater than 1 volt?

Y10 CHECK THE BLOWER+ CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to Y11.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Y11 CHECK THE BLOWER+ AND BLOWER- CIRCUITS FOR AN OPEN

Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and cushion TED C3300-2, circuit CHS03 (GN/BN), harness side; and between DCSM C3305c-15, circuit RHS03 (GY/OG), harness side and cushion TED C3300-4, circuit RHS03 (GY/OG), harness side.

Are the resistances less than 5 ohms?

Yes
GO to Y12.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Y12 CHECK THE BLOWER+ TO BLOWER- RESISTANCE

CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between cushion TED C3300 pin 2 and pin 4, component side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
GO to Y13.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Y13 CHECK THE BLOWER SPEED CONTROL RESISTANCE

CAUTION: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between cushion TED C3300 pin 7 and pin 4, component side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
GO to Y14.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Y14 CHECK THE TED INSTALLATION AND FOR CRUSHED SEAT CUSHION

Remove the seat. Refer to Seat — Front in this section.
Remove the seat cushion trim cover. Refer to Seat Cushion Cover — Front in this section.
Inspect the seat cushion for the following:

Is the TED correctly installed?

Is the seat cushion foam pad crushed or restricted?

Is the climate controlled seat manifold crushed or restricted?

Is the TED correctly installed and are there no signs of damage to the foam pad and manifold?

Yes
INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
CORRECTLY install the cushion TED or INSTALL a new seat cushion foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test Z: DTC B272A — Passenger Cushion Over-Temp Detected

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A passenger seat cushion over-temp fault can be caused by:

wiring, terminals or connectors.
restricted cushion TED filter.
crushed or restricted cushion foam pad.
crushed or restricted climate controlled seat manifold.
a faulted cushion TED assembly.
a faulted DCSM.

PINPOINT TEST Z: DTC B272A — PASSENGER CUSHION OVER-TEMP DETECTED

Test Step

Result / Action to Take

Z1 CHECK THE DCSM FOR ON-DEMAND DTCS

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the passenger seat side air bag C313.

Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313.

Connect the battery ground cable.

Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool: Dual Climate Controlled Seat Module (DCSM) Self Test/Retrieve DTCs.
Was DTC B272A retrieved during the on-demand self test?

Yes
GO to Z2.

No
GO to Z4.

Z2 CHECK THE TED THERMISTOR CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Disconnect: DCSM C3305b.
Disconnect: Cushion TED C3303.
Measure the resistance between DCSM C3305b-2, circuit VHS27 (WH/OG), harness side and ground and between DCSM C3305b-3, circuit RHS10 (BU/OG), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to Z3.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Z3 CHECK THE TED THERMISTOR

Measure the resistance between cushion TED C3303 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

Yes
REPAIR the affected open circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Z4 CONFIRM THE FAULT

Verify with the customer that the concern is the seat shuts OFF in heat mode.
NOTE: A crushed seat cushion foam pad or a crushed climate controlled seat manifold may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.
Attempt to recreate the fault. Start the vehicle and set the passenger seat to high heat for at least 15 minutes.
Is the customer concern with the seat shutting OFF in heat mode or was the fault recreated?

Yes
GO to Z5.

No
Fault not present. Fault may have been set due to a past failure or incorrect use of the climate controlled seat system by repeated switching between HEAT and COOL modes. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Z5 CHECK OPERATION OF THE SEAT

Key in ON position.
With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
Compare the airflow from the passenger seat cushion and compare it to the airflow from the driver seat cushion.
Is the airflow exhausting from the passenger seat cushion comparable to the airflow exhausting from the driver seat cushion?

Yes
GO to Z4.

No
GO to Z6.

Z6 CHECK THE CUSHION BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER

Key in OFF position.
Inspect the blower of the cushion TED assembly for an obstruction or for a restricted filter.
Is the blower obstructed or the filter restricted?

Yes
REMOVE the obstruction or INSTALL a new filter. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
GO to Z7.

Z7 CHECK THE CUSHION FAN OPERATION

Key in ON position.
With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
Inspect the cushion blower for operation.
Does the cushion blower operate?

Yes
GO to Z14.

No
GO to Z8.

Z8 CHECK THE BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN

Key in OFF position.
Disconnect: DCSM C3305c.
Disconnect: Cushion TED C3303.
Measure the resistance between DCSM C3305c-3, circuit VHS23 (BN/BU), harness side and cushion TED C3303-7, circuit VHS23 (BN/BU), harness side.

Is the resistance less than 5 ohms?

Yes
GO to Z9.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Z9 CHECK THE BLOWER- CIRCUIT FOR A SHORT TO VOLTAGE

Key in ON position.
Measure the voltage between DCSM C3305c-7, circuit RHS08 (VT/WH), harness side and ground.

Is voltage greater than 1 volt?

Z10 CHECK THE BLOWER+ CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to Z11.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Z11 CHECK THE BLOWER+ AND BLOWER- CIRCUITS FOR AN OPEN

Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and cushion TED C3303-2, circuit CHS08 (BN/YE), harness side; and between DCSM C3305c-7, circuit RHS08 (VT/WH), harness side and cushion TED C3311-4, circuit RHS08 (VT/WH), harness side.

Are the resistances less than 5 ohms?

Yes
GO to Z12.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Z12 CHECK THE BLOWER+ TO BLOWER- RESISTANCE

CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between cushion TED C3303 pin 2 and pin 4, component side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
GO to Z13.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Z13 CHECK THE BLOWER SPEED CONTROL RESISTANCE

CAUTION: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between cushion TED C3303 pin 7 and pin 4, component side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
GO to Z14.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Z14 CHECK THE TED INSTALLATION AND FOR CRUSHED SEAT CUSHION

Remove the seat. Refer to Seat — Front in this section.
Remove the seat cushion trim cover. Refer to Seat Cushion Cover — Front in this section.
Inspect the seat cushion for the following:

Is the TED correctly installed?

Is the seat cushion foam pad crushed or restricted?

Is the climate controlled seat manifold crushed or restricted?

Is the TED correctly installed and are there no signs of damage to the foam pad and manifold?

Pinpoint Test AA: DTC B272B — Passenger Back Over-Temp Detected

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A driver seat backrest over-temp fault can be caused by:

wiring, terminals or connectors.
restricted backrest TED filter.
crushed or restricted backrest foam pad.
crushed or restricted climate controlled seat manifold.
a faulted backrest TED assembly.
a faulted DCSM.

PINPOINT TEST AA: DTC B272B — PASSENGER BACK OVER-TEMP DETECTED

Test Step

Result / Action to Take

AA1 CHECK THE DCSM FOR ON-DEMAND DTCS

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the passenger seat side air bag C313.

Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313.

Connect the battery ground cable.

Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool: Dual Climate Controlled Seat Module (DCSM) Self Test/Retrieve DTCs.
Was DTC B2730 retrieved during the on-demand self test?

Yes
GO to AA2.

No
GO to AA4.

AA2 CHECK THE TED THERMISTOR CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Disconnect: DCSM C3305b.
Disconnect: Backrest TED C3311.
Measure the resistance between DCSM C3305b-4, circuit VHS36 (YE/BU), harness side and ground and between DCSM C3305b-5, circuit RHS20 (GN/BU), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to AA3.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AA3 CHECK THE TED THERMISTOR

Measure the resistance between backrest TED C3311 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

Yes
REPAIR the affected open circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AA4 CONFIRM THE FAULT

Verify with the customer that the concern is the seat shuts OFF in heat mode.
NOTE: A crushed seat backrest foam pad or a crushed climate controlled seat manifold may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.
Attempt to recreate the fault. Start the vehicle and set the front passenger seat to high heat for at least 15 minutes.
Is the customer concern with the seat shutting OFF in heat mode or was the fault recreated?

Yes
GO to AA5.

No
Fault not present. Fault may have been set due to a past failure or incorrect use of the climate controlled seat system by repeated switching between HEAT and COOL modes. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AA5 CHECK OPERATION OF THE SEAT

Key in ON position.
With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
Compare the airflow from the front passenger seat backrest and compare it to the airflow from the driver seat backrest.
Is the airflow exhausting from the front passenger seat backrest comparable to the airflow exhausting from the driver seat backrest?

Yes
GO to AA14.

No
GO to AA6.

AA6 CHECK THE BACKREST BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER

Key in OFF position.
Inspect the blower of the backrest TED assembly for an obstruction or for a restricted filter.
Is the blower obstructed or the filter restricted?

AA7 CHECK THE BACKREST FAN OPERATION

Key in ON position.
With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
Inspect the backrest blower for operation.
Does the backrest blower operate?

Yes
GO to AA14.

No
GO to AA8.

AA8 CHECK THE BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN

Key in OFF position.
Disconnect: DCSM C3305c.
Disconnect: Backrest TED C3311.
Measure the resistance between DCSM C3305c-4, circuit VHS21 (BU/WH), harness side and backrest TED C3310-7, circuit VHS21 (BU/WH), harness side.

Is the resistance less than 5 ohms?

Yes
GO to AA9.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AA9 CHECK THE BLOWER- CIRCUIT FOR A SHORT TO VOLTAGE

Key in ON position.
Measure the voltage between DCSM C3305c-7, circuit RHS08 (VT/WH), harness side and ground.

Is voltage greater than 1 volt?

AA10 CHECK THE BLOWER+ CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to AA11.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AA11 CHECK THE BLOWER+ AND BLOWER- CIRCUITS FOR AN OPEN

Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and backrest TED C3311-2, circuit CHS08 (GY/RD), harness side; and between DCSM C3305c-7, circuit RHS08 (VT/WH), harness side and backrest TED C3311-4, circuit RHS08 (VT/WH), harness side.

Are the resistances less than 5 ohms?

Yes
GO to AA12.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AA12 CHECK THE BLOWER+ TO BLOWER- RESISTANCE

CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between backrest TED C3311 pin 2 and pin 4, component side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
GO to AA13.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AA13 CHECK THE BLOWER SPEED CONTROL RESISTANCE

CAUTION: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between backrest TED C3311 pin 7 and pin 4, component side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
GO to AA14.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AA14 CHECK THE TED INSTALLATION AND FOR CRUSHED SEAT BACKREST

Remove the seat. Refer to Seat — Front in this section.
Remove the seat backrest trim cover. Refer to Seat Backrest Cover — Front, Without Fold Flat in this section.
Inspect the seat backrest for the following:

Is the TED correctly installed?

Is the seat backrest foam pad crushed or restricted?

Is the climate controlled seat manifold crushed or restricted?

Is the TED correctly installed and are there no signs of damage to the foam pad and manifold?

Yes
INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
CORRECTLY install the backrest TED or INSTALL a new seat backrest foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test AB: DTC B272C — Driver Differential Temperature Fault

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

A differential fault occurs when the cushion and backrest TEDs on an affected seat are reporting very different temperatures to the DCSM. This may result from an airflow restriction or a circuit fault of either TED area. If a TED and manifold is clear of obstruction and is operational, the other TED and circuitry on the seat should be checked. It is important to note that a TED with a higher temperature may be operating correctly and not the area of concern. The other TED may be indicating a much lower temperature, causing the DTC to set.

Possible Causes

A driver differential temperature fault can be caused by:

wiring, terminals or connectors.
restricted cushion or backrest TED filter.
crushed or restricted cushion or backrest foam pad.
crushed or restricted cushion or backrest climate controlled seat manifold.
a faulted cushion or backrest TED assembly.
a faulted DCSM.

PINPOINT TEST AB: DTC B272C — DRIVER DIFFERENTIAL TEMPERATURE FAULT

Test Step

Result / Action to Take

AB1 CHECK THE DCSM FOR ON-DEMAND DTCS

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the driver seat side air bag module C327.

Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327.

Disconnect the passenger seat side air bag module C313.

Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313.

Connect the battery ground cable.

Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool: Dual Climate Controlled Seat Module (DCSM) Self Test/Retrieve DTCs.
Was DTC B2729 or B2730 retrieved during the on-demand self test or as a continuous DTC?

Yes
For DTC B2729, Go To Pinpoint Test Y. For DTC B2730, Go To Pinpoint Test AD.

No
GO to AB2.

AB2 MONITOR THE DCSM TED TEMPERATURE PIDS

Enter the following diagnostic mode on the diagnostic tool: Monitor DCSM TED Temperature PIDs.
CAUTION: Make sure the temperature of the climate controlled seats has stabilized before monitoring the PIDs.
Monitor the TED temperature PIDs with the climate controlled seats OFF. Compare the PIDs of the driver seat to those of the front passenger seat, this can help identify if there is a concern with the driver seat cushion or backrest PID readings.
Are both driver seat TED temperature PIDs within 10°C (18°F) of the ambient temperature?

Yes
GO to AB3.

No
If the driver seat cushion PID varies 10°C (18°F) or more from ambient temperature, GO to AB15 .

If the driver seat backrest PID varies 10°C (18°F) or more from ambient temperature, GO to AB31 .

AB3 CONFIRM THE FAULT IS IN THE SEAT CUSHION OR THE BACKREST

Key in OFF position.
Key in ON position.
NOTE: A crushed seat cushion foam pad or a crushed climate controlled seat manifold may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.
NOTE: If the seat shuts down before a 15 minute heat cycle has timed-out, carry out the DCSM on-demand self test and go to the Dual Climate Controlled Seat Module (DCSM) Diagnostic Trouble Code (DTC) Table to continue diagnostics.
After cycling the ignition switch and with the engine running, set the driver seat to high heat (3 LEDs illuminated on EATC module). Allow the seat to heat for at least 15 minutes while monitoring the TED temperature PIDs of the driver seat. If necessary, when the seat times-out after 15 minutes, set the driver seat to high heat once again.
Do the driver seat cushion or backrest PIDs vary more than 10°C (18°F)?

Yes
If the driver seat cushion PID is 10°C (18°F) hotter than the backrest PID, GO to AB4 .

If the driver seat backrest PID is 10°C (18°F) hotter than the cushion PID, GO to AB19 .

No
Fault is currently not present. INSPECT for crushed seat cushion or backrest foam pad or climate controlled seat cushion or backrest manifold. CHECK for an intermittent wiring fault. REPAIR as needed. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB4 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT CUSHION

Key in OFF position.
Remove the seat. Refer to Seat — Front in this section.
Remove the seat cushion trim cover. Refer to Seat Cushion Cover — Front in this section.
Inspect the seat cushion for the following:

Is the cushion blower obstructed?

Is the blower filter restricted or plugged?

Is the TED correctly installed?

Is the seat cushion foam pad crushed or restricted?

Is the climate controlled seat manifold crushed or restricted?

Is the TED correctly installed and are there no signs of damage to the foam pad and manifold?

Yes
GO to AB5.

No
CORRECTLY install the cushion TED or INSTALL a new seat cushion foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB5 CHECK THE BACKREST TED- CIRCUIT FOR SHORT TO VOLTAGE

Disconnect: DCSM C3305a.
Position the driver seat in the vehicle and connect the seat-to-floor connectors.
Key in ON position.
Measure the voltage between DCSM C3305a-K, circuit RHS01 (WH/VT), harness side and ground.

Is the voltage less than 0.5 volt?

Yes
GO to AB6.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB6 CHECK THE BACKREST TED+ CIRCUIT FOR SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305a-J, circuit CHS01 (GY/VT), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to AB7.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB7 CHECK RESISTANCE OF THE BACKREST TED AND WIRING

Measure the resistance between DCSM C3305a-J, circuit CHS01 (GY/VT), harness side and DCSM C3305a-K, circuit RHS01 (WH/VT), harness side.

Is the resistance between 0.9 and 10 ohms?

Yes
GO to AB9.

No
GO to AB8.

AB8 CHECK RESISTANCE OF THE BACKREST TED

Disconnect: Backrest TED C3310.
Measure the resistance between backrest TED C3310 pin 1 and pin 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB9 CHECK THE BLOWER+ AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect: DCSM C3305c.
Key in ON position.
Measure the voltage between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground and between DCSM C3305c-11, circuit VHS18 (BN/GN), harness side and ground.

Are the voltages less than 1 volt?

Yes
GO to AB10.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB10 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground and between DCSM C3305c-11, circuit VHS18 (BN/GN), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to AB11.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB11 CHECK THE BLOWER AND WIRING

CAUTION: The ohmmeter must be connected with the positive lead to DCSM C3305c-16, circuit CHS03 (GN/BN) and the negative lead to DCSM C3305c-15, circuit RHS03 (GY/OG) when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and DCSM C3305c-15, circuit RHS03 (GY/OG), harness side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
GO to AB13.

No
GO to AB12.

AB12 CHECK THE BLOWER

Disconnect: Cushion TED C3300.
CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between cushion TED C3300 pin 2 and pin 4, component side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB13 CHECK BLOWER SPEED CONTROL AND CIRCUIT

CAUTION: The ohmmeter must be connected with the positive lead to C3305c-11, circuit VHS18 (BN/GN), harness side and the negative lead to C3305c-15, circuit RHS03 (GY/OG), harness side when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305c-11, circuit VHS18 (BN/GN) harness side and DCSM C3305c-15, circuit RHS03 (GY/OG), harness side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
GO to AB15.

No
GO to AB14.

AB14 CHECK THE BLOWER SPEED CONTROL

Disconnect: Cushion TED C3300.
CAUTION: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between cushion TED C3300 pin 7 and pin 4, component side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB15 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect: DCSM C3305b.
Key in ON position.
Measure the voltage between DCSM C3305b-7, circuit VHS26 (VT), harness side and ground.

Is the voltage less than 0.5 volt?

AB16 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305b-7, circuit VHS26 (VT), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to AB17.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB17 CHECK THE THERMISTOR AND WIRING

Measure the resistance between DCSM C3305b-7, circuit VHS26 (VT), harness side and DCSM C3305b-8, circuit RHS05 (YE/VT), harness side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

AB18 CHECK THE THERMISTOR

Disconnect: Cushion TED C3300.
Measure the resistance between cushion TED pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB19 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT BACKREST

Key in OFF position.
Remove the seat. Refer to Seat — Front in this section.
Remove the seat backrest trim cover. Refer to Seat Backrest Cover — Front, Without Fold Flat in this section.
Inspect the seat backrest for the following:

Is the backrest blower obstructed?

Is the blower filter restricted or plugged?

Is the TED correctly installed?

Is the seat backrest foam pad crushed or restricted?

Is the climate controlled seat manifold crushed or restricted?

Is the TED correctly installed and are there no signs of damage to the foam pad and manifold?

Yes
GO to AB20.

No
CORRECTLY install the backrest TED or INSTALL a new seat backrest foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB20 CHECK THE CUSHION TED- CIRCUIT FOR SHORT TO VOLTAGE

Disconnect: DCSM C3305a.
Position the driver seat in the vehicle and connect the seat-to-floor connectors.
Key in ON position.
Measure the voltage between DCSM C3305a-H, circuit RHS02 (BU/OG), harness side and ground.

Is the voltage less than 0.5 volt?

Yes
GO to AB21.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB21 CHECK THE CUSHION TED+ CIRCUIT FOR SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305a-G, circuit CHS02 (YE/BU), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to AB22.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB22 CHECK RESISTANCE OF THE CUSHION TED AND WIRING

Measure the resistance between DCSM C3305a-G circuit CHS02 (YE/BU), harness side and DCSM C3305a-H, circuit RHS02 (BU/OG), harness side.

Is the resistance between 0.9 and 10 ohms?

Yes
GO to AB24.

No
GO to AB23.

AB23 CHECK RESISTANCE OF THE CUSHION TED

Disconnect: Cushion TED C3300.
Measure the resistance between cushion TED C3300 pin 1 and pin 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB24 CHECK THE BLOWER+ AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect: DCSM C3305c.
Key in ON position.
Measure the voltage between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground and between DCSM C3305c-12, circuit VHS16 (BU/GN), harness side and ground.

Are the voltages less than 1 volt?

Yes
GO to AB25.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB25 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground and between DCSM C3305c-12, circuit VHS16 (BU/GN), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to AB26.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB26 CHECK THE BLOWER AND WIRING

CAUTION: The ohmmeter must be connected with the positive lead to DCSM C3305c-16, circuit CHS03 (GN/BN) and the negative lead to DCSM C3305c-15, circuit RHS03 (GY/OG) when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and DCSM C3305c-15, circuit RHS03 (GY/OG), harness side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
GO to AB28.

No
GO to AB27.

AB27 CHECK THE BLOWER

Disconnect: Backrest TED C3310.
CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between backrest TED C3310 pin 2 and pin 4, component side.

Is the resistance between 6 Kohms and 9 Kohms?

AB28 CHECK BLOWER SPEED CONTROL AND CIRCUIT

CAUTION: The ohmmeter must be connected with the positive lead to C3305c-12, circuit VHS16 (BU/GN), harness side and the negative lead to C3305c-15, circuit RHS03 (GY/OG), harness side when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305c-12, circuit VHS16 (BU/GN) harness side and DCSM C3305c-15, circuit RHS03 (GY/OG), harness side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
GO to AB30.

No
GO to AB29.

AB29 CHECK THE BLOWER SPEED CONTROL

Disconnect: Backrest TED C3310.
CAUTION: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between backrest TED C3310 pin 7 and pin 4, component side.

Is the resistance between 290 Kohms and 420 Kohms?

AB30 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect: DCSM C3305b.
Key in ON position.
Measure the voltage between DCSM C3305b-9, circuit VHS35 (VT/OG), harness side and ground.

Is the voltage less than 0.5 volt?

AB31 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305b-9, circuit VHS35 (VT/OG), harness side and ground.

Is the resistance greater than 10,000 volts?

Yes
GO to AB32.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AB32 CHECK THE THERMISTOR AND WIRING

Measure the resistance between DCSM C3305b-9, circuit VHS35 (VT/OG), harness side and DCSM C3305b-10, circuit RHS15 (GY/BN), harness side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

AB33 CHECK THE THERMISTOR

Disconnect: Backrest TED C3310.
Measure the resistance between backrest TED pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

Pinpoint Test AC: DTC B272D — Passenger Differential Temperature Fault

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A driver differential temperature fault can be caused by:

wiring, terminals or connectors.
restricted cushion or backrest TED filter.
crushed or restricted cushion or backrest foam pad.
crushed or restricted cushion or backrest climate controlled seat manifold.
a faulted cushion or backrest TED assembly.
a faulted DCSM.

PINPOINT TEST AC: DTC B272D — PASSENGER DIFFERENTIAL TEMPERATURE FAULT

Test Step

Result / Action to Take

AC1 CHECK THE DCSM FOR ON-DEMAND DTCS

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles equipped with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the passenger seat side air bag C313.

Connect restraint system diagnostic tool 418-133 to the passenger seat side air bag C313.

Connect the battery ground cable.

Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool: Dual Climate Controlled Seat Module (DCSM) Self Test/Retrieve DTCs.
Was DTC B272A or B272B retrieved during the on-demand self test or as a continuous DTC?

Yes
For DTC B272A, Go To Pinpoint Test Z. For DTC B272B, Go To Pinpoint Test AA.

No
GO to AC2.

AC2 MONITOR THE DCSM TED TEMPERATURE PIDS

Enter the following diagnostic mode on the diagnostic tool: Monitor DCSM TED Temperature PIDs.
CAUTION: Make sure the temperature of the climate controlled seats has stabilized before monitoring the PIDs.
Monitor the TED temperature PIDs with the climate controlled seats OFF. Compare the PIDs of the front passenger seat to those of the driver seat, this can help identify if there is a concern with the front passenger seat cushion or backrest PID readings.
Are both front passenger seat TED temperature PIDs within 10°C (18°F) of the ambient temperature?

Yes
GO to AC3.

No
If the front passenger seat cushion PID varies 10°C (18°F) or more from ambient temperature, GO to AC15 .

If the front passenger seat backrest PID varies 10°C (18°F) or more from ambient temperature, GO to AC31 .

AC3 CONFIRM THE FAULT IS IN THE SEAT CUSHION OR THE BACKREST

Key in OFF position.
Key in ON position.
NOTE: A crushed seat cushion foam pad or a crushed climate controlled seat manifold may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.
NOTE: If the seat shuts down before a 15 minute heat cycle has timed-out, carry out the DCSM on-demand self test and go to the Dual Climate Controlled Seat Module (DCSM) Diagnostic Trouble Code (DTC) Table to continue diagnostics.
After cycling the ignition switch and with the engine running, set the driver seat to high heat (3 LEDs illuminated on EATC module). Allow the seat to heat for at least 15 minutes while monitoring the TED temperature PIDs of the driver seat. If necessary, when the seat times-out after 15 minutes, set the driver seat to high heat once again.
Do the front passenger seat cushion or backrest PIDs vary more than 10°C (18°F)?

Yes
If the front passenger seat cushion PID is 10°C (18°F) hotter than the backrest PID, GO to AC4 .

If the front passenger seat backrest PID is 10°C (18°F) hotter than the cushion PID, GO to AC19 .

No
Fault is currently not present. INSPECT for crushed seat cushion or backrest foam pad or climate controlled seat cushion or backrest manifold. CHECK for an intermittent wiring fault. REPAIR as needed. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC4 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT CUSHION

Key in OFF position.
Remove the seat. Refer to Seat — Front in this section.
Remove the seat cushion trim cover. Refer to Seat Cushion Cover — Front in this section.
Inspect the seat cushion for the following:

Is the cushion blower obstructed?

Is the blower filter restricted or plugged?

Is the TED correctly installed?

Is the seat cushion foam pad crushed or restricted?

Is the climate controlled seat manifold crushed or restricted?

Is the TED correctly installed and are there no signs of damage to the foam pad and manifold?

Yes
GO to AC5.

No
CORRECTLY install the cushion TED or INSTALL a new seat cushion foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC5 CHECK THE BACKREST TED- CIRCUIT FOR SHORT TO VOLTAGE

Disconnect: DCSM C3305a.
Position the front passenger seat in the vehicle and connect the seat-to-floor connectors.
Key in ON position.
Measure the voltage between DCSM C3305a-D, circuit RHS06 (WH), harness side and ground.

Is the voltage less than 0.5 volt?

Yes
GO to AC6.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC6 CHECK THE BACKREST TED+ CIRCUIT FOR SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305a-C, circuit CHS06 (BU/BN), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to AC7.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC7 CHECK RESISTANCE OF THE BACKREST TED AND WIRING

Measure the resistance between DCSM C3305a-C, circuit CHS06 (BU/BN), harness side and DCSM C3305a-D, circuit RHS06 (WH), harness side.

Is the resistance between 0.9 and 10 ohms?

Yes
GO to AC9.

No
GO to AC8.

AC8 CHECK RESISTANCE OF THE BACKREST TED

Disconnect: Backrest TED C3311.
Measure the resistance between backrest TED C3311 pin 1 and pin 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC9 CHECK THE BLOWER+ AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect: DCSM C3305c.
Key in ON position.
Measure the voltage between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and ground and between DCSM C3305c-3, circuit VHS23 (BN/BU), harness side and ground.

Are the voltages less than 1 volt?

Yes
GO to AC10.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC10 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and ground and between DCSM C3305c-3, circuit VHS23 (BN/BU), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to AC11.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC11 CHECK THE BLOWER AND WIRING

CAUTION: The ohmmeter must be connected with the positive lead to DCSM C3305c-8, circuit CHS08 (BN/YE) and the negative lead to DCSM C3305c-7, circuit RHS08 (VT/WH) when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and DCSM C3305c-7, circuit RHS08 (VT/WH), harness side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
GO to AC13.

No
GO to AC12.

AC12 CHECK THE BLOWER

Disconnect: Cushion TED C3303.
CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between cushion TED C3303 pin 2 and pin 4, component side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC13 CHECK BLOWER SPEED CONTROL AND CIRCUIT

CAUTION: The ohmmeter must be connected with the positive lead to C3305c-3, circuit VHS23 (BN/BU), harness side and the negative lead to C3305c-7, circuit RHS08 (VT/WH), harness side when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305c-3, circuit VHS23 (BN/BU) harness side and DCSM C3305c-7, circuit RHS08 (VT/WH), harness side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
GO to AC15.

No
GO to AC14.

AC14 CHECK THE BLOWER SPEED CONTROL

Disconnect: Cushion TED C3303.
CAUTION: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between cushion TED C3303 pin 7 and pin 4, component side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC15 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect: DCSM C3305b.
Key in ON position.
Measure the voltage between DCSM C3305b-2, circuit VHS27 (WH/OG), harness side and ground.

Is the voltage less than 0.5 volt?

AC16 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305b-2, circuit VHS27 (WH/OG), harness side and ground.

Is the resistance greater than 10,000 volts?

Yes
GO to AC17.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC17 CHECK THE THERMISTOR AND WIRING

Measure the resistance between DCSM C3305b-2, circuit VHS27 (WH/OG), harness side and DCSM C3305b-3, circuit RHS10 (BU/OG), harness side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

AC18 CHECK THE THERMISTOR

Disconnect: Cushion TED C3303.
Measure the resistance between cushion TED pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC19 CHECK THE TED INSTALLATION AND FOR A CRUSHED SEAT BACKREST

Key in OFF position.
Remove the seat. Refer to Seat — Front in this section.
Remove the seat backrest trim cover. Refer to Seat Backrest Cover — Front, Without Fold Flat in this section.
Inspect the seat backrest for the following:

Is the backrest blower obstructed?

Is the blower filter restricted or plugged?

Is the TED correctly installed?

Is the seat backrest foam pad crushed or restricted?

Is the climate controlled seat manifold crushed or restricted?

Is the TED correctly installed and are there no signs of damage to the foam pad and manifold?

Yes
GO to AC20.

No
CORRECTLY install the backrest TED or INSTALL a new seat backrest foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC20 CHECK THE CUSHION TED- CIRCUIT FOR SHORT TO VOLTAGE

Disconnect: DCSM C3305a.
Position the front passenger seat in the vehicle and connect the seat-to-floor connectors.
Key in ON position.
Measure the voltage between DCSM C3305a-B, circuit RHS07 (BU), harness side and ground.

Is the voltage less than 0.5 volt?

Yes
GO to AC21.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC21 CHECK THE CUSHION TED+ CIRCUIT FOR SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305a-A, circuit CHS07 (GY/BU), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to AC22.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC22 CHECK RESISTANCE OF THE CUSHION TED AND WIRING

Measure the resistance between DCSM C3305a-A circuit CHS07 (GY/BU), harness side and DCSM C3305a-B, circuit RHS07 (BU), harness side.

Is the resistance between 0.9 and 10 ohms?

Yes
GO to AC24.

No
GO to AC23.

AC23 CHECK RESISTANCE OF THE CUSHION TED

Disconnect: Cushion TED C3303.
Measure the resistance between cushion TED C3303 pin 1 and pin 3, component side.

Is the resistance between 0.9 and 10 ohms?

Yes
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new cushion TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC24 CHECK THE BLOWER+ AND SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect: DCSM C3305c.
Key in ON position.
Measure the voltage between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and ground and between DCSM C3305c-4, circuit VHS21 (BU/WH), harness side and ground.

Are the voltages less than 1 volt?

Yes
GO to AC25.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC25 CHECK THE BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and ground and between DCSM C3305c-4, circuit VHS21 (BU/WH), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to AC26.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC26 CHECK THE BLOWER AND WIRING

CAUTION: The ohmmeter must be connected with the positive lead to DCSM C3305c-8, circuit CHS08 (BN/YE) and the negative lead to DCSM C3305c-7, circuit RHS08 (VT/WH) when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305c-8, circuit CHS08 (BN/YE), harness side and DCSM C3305c-7, circuit RHS08 (VT/WH), harness side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
GO to AC28.

No
GO to AC27.

AC27 CHECK THE BLOWER

Disconnect: Backrest TED C3311.
CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between backrest TED C3311 pin 2 and pin 4, component side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC28 CHECK BLOWER SPEED CONTROL AND CIRCUIT

CAUTION: The ohmmeter must be connected with the positive lead to C3305c-4, circuit VHS21 (BU/WH), harness side and the negative lead to C3305c-7, circuit RHS08 (VT/WH), harness side when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between DCSM C3305c-4, circuit VHS21 (BU/WH) harness side and DCSM C3305c-7, circuit RHS08 (VT/WH), harness side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
GO to AC30.

No
GO to AC29.

AC29 CHECK THE BLOWER SPEED CONTROL

Disconnect: Backrest TED C3311.
CAUTION: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between backrest TED C3311 pin 7 and pin 4, component side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC30 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect: DCSM C3305b.
Key in ON position.
Measure the voltage between DCSM C3305b-4, circuit VHS36 (YE/BU), harness side and ground.

Is the voltage less than 0.5 volt?

AC31 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305b-4, circuit VHS36 (YE/BU), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to AC32.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AC32 CHECK THE THERMISTOR AND WIRING

Measure the resistance between DCSM C3305b-4, circuit VHS36 (YE/BU), harness side and DCSM C3305b-5, circuit RHS20 (GN/BU), harness side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

AC33 CHECK THE THERMISTOR

Disconnect: Backrest TED C3311.
Measure the resistance between backrest TED pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

Yes
REPAIR the affected circuit(s). REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test AD: DTC B2730 — Back Over-Temp Detected (Driver)

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A driver seat backrest over-temp fault can be caused by:

wiring, terminals or connectors.
restricted backrest TED filter.
crushed or restricted backrest foam pad.
crushed or restricted climate controlled seat manifold.
a faulted backrest TED assembly.
a faulted DCSM.

PINPOINT TEST AD: DTC B2730 — BACK OVER-TEMP DETECTED (DRIVER)

Test Step

Result / Action to Take

AD1 CHECK THE DCSM FOR ON-DEMAND DTCS

NOTE:

Key in OFF position.
WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
For vehicles with seat side air bags, carry out the following:

Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.

Disconnect the driver seat side air bag module C327.

Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327.

Disconnect the passenger seat side air bag module C313.

Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313.

Connect the battery ground cable.

Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool: Dual Climate Controlled Seat Module (DCSM) Self Test/Retrieve DTCs.
Was DTC B2730 retrieved during the on-demand self test?

Yes
GO to AD2.

No
GO to AD4.

AD2 CHECK THE TED THERMISTOR CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Disconnect: DCSM C3305b.
Disconnect: Backrest TED C3310.
Measure the resistance between DCSM C3305b-9, circuit VHS35 (VT/OG), harness side and ground and between DCSM C3305b-10, circuit RHS15 (GY/BN), harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes
GO to AD3.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AD3 CHECK THE TED THERMISTOR

Measure the resistance between backrest TED C3310 pin 5 and pin 8, component side. Note the ambient temperature and refer to the following table.

Temperature	Resistance
0-10°C (32-50°F)	2782-1663 ohms
10-20°C (50-68°F)	1837-1140 ohms
20-30°C (68-86°F)	1260-806 ohms
30-40°C (86-104°F)	893-570 ohms
40-50°C (104-122°F)	630-428 ohms

Is the resistance within the limits indicated?

Yes
REPAIR the affected open circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AD4 CONFIRM THE FAULT

Verify with the customer that the concern is the seat shuts OFF in heat mode.
NOTE: A crushed seat backrest foam pad or a crushed climate controlled seat manifold may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.
Attempt to recreate the fault. Start the vehicle and set the driver seat to high heat for at least 15 minutes.
Is the customer concern with the seat shutting OFF in heat mode or was the fault recreated?

Yes
GO to AD5.

No
Fault not present. Fault may have been set due to a past failure or incorrect use of the climate controlled seat system by repeated switching between HEAT and COOL modes. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AD5 CHECK OPERATION OF THE SEAT

Key in ON position.
With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
Compare the airflow from the driver seat backrest and compare it to the airflow from the passenger seat backrest.
Is the airflow exhausting from the driver seat backrest comparable to the airflow exhausting from the passenger seat backrest?

Yes
GO to AD14.

No
GO to AD6.

AD6 CHECK THE BACKREST BLOWER FOR AN OBSTRUCTION OR RESTRICTED FILTER

Key in OFF position.
Inspect the blower of the backrest TED assembly for an obstruction or for a restricted filter.
Is the blower obstructed or the filter restricted?

AD7 CHECK THE BACKREST FAN OPERATION

Key in ON position.
With the engine running, set both front seats to high cool (3 LEDs illuminated on EATC module).
Inspect the backrest blower for operation.
Does the backrest blower operate?

Yes
GO to AD14.

No
GO to AD8.

AD8 CHECK THE BLOWER SPEED CONTROL CIRCUIT FOR AN OPEN

Key in OFF position.
Disconnect: DCSM C3305c.
Disconnect: Backrest TED C3310.
Measure the resistance between DCSM C3305c-12, circuit VHS16 (BU/GN), harness side and backrest TED C3310-7, circuit VHS16 (BU/GN), harness side.

Is the resistance less than 5 ohms?

Yes
GO to AD9.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AD9 CHECK THE BLOWER- CIRCUIT FOR A SHORT TO VOLTAGE

Key in ON position.
Measure the voltage between DCSM C3305c-15, circuit RHS03 (GY/OG), harness side and ground.

Is voltage greater than 1 volt?

AD10 CHECK THE BLOWER+ CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and ground.

Is the resistance greater than 10,000 ohms?

Yes
GO to AD11.

No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AD11 CHECK THE BLOWER+ AND BLOWER- CIRCUITS FOR AN OPEN

Measure the resistance between DCSM C3305c-16, circuit CHS03 (GN/BN), harness side and backrest TED C3310-2, circuit CHS03 (GN/BN), harness side; and between DCSM C3305c-15, circuit RHS03 (GY/OG), harness side and backrest TED C3310-4, circuit RHS03 (GY/OG), harness side.

Are the resistances less than 5 ohms?

Yes
GO to AD12.

No
REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AD12 CHECK THE BLOWER+ TO BLOWER- RESISTANCE

CAUTION: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between backrest TED C3310 pin 2 and pin 4, component side.

Is the resistance between 6 Kohms and 9 Kohms?

Yes
GO to AD13.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AD13 CHECK THE BLOWER SPEED CONTROL RESISTANCE

CAUTION: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected will result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between backrest TED C3310 pin 7 and pin 4, component side.

Is the resistance between 290 Kohms and 420 Kohms?

Yes
GO to AD14.

No
INSTALL a new backrest TED. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

AD14 CHECK THE TED INSTALLATION AND FOR CRUSHED SEAT BACKREST

Remove the seat. Refer to Seat — Front in this section.
Remove the seat backrest trim cover. Refer to Seat Backrest Cover — Front, Without Fold Flat in this section.
Inspect the seat backrest for the following:

Is the TED correctly installed?

Is the seat backrest foam pad crushed or restricted?

Is the climate controlled seat manifold crushed or restricted?

Is the TED correctly installed and are there no signs of damage to the foam pad and manifold?

Yes
INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

No
CORRECTLY install the backrest TED or INSTALL a new seat backrest foam pad and/or climate controlled seat manifold. REPEAT the self-test. CLEAR the DTCs.

If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test AE: A Single Climate Controlled Seat Is Inoperative/Does Not Operate Correctly

Refer to Wiring Diagrams Cell 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

Possible Causes

A single climate controlled seat that does not operate can be caused by:

wiring, terminals or connectors.
an MS-CAN fault.
a faulted electronic automatic temperature control (EATC) module.
a faulted DCSM.

PINPOINT TEST AE: A SINGLE CLIMATE CONTROLLED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

Test Step	Result / Action to Take
AE1 CHECK THE DCSM FOR ON-DEMAND DTCS
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Key in OFF position. WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected. For vehicles with seat side air bags, carry out the following: Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B. Disconnect the driver seat side air bag module C327. Connect restraint system diagnostic tool 418-133 to driver seat side air bag module C327. Disconnect the passenger seat side air bag module C313. Connect restraint system diagnostic tool 418-133 to passenger seat side air bag module C313. Connect the battery ground cable. Connect the diagnostic tool. Enter the following diagnostic mode on the diagnostic tool: Dual Climate Controlled Seat Module (DCSM) Self Test/Retrieve DTCs. Were any DTCs retrieved during the on-demand self test?	Yes GO to the Dual Climate Controlled Seat Module (DCSM) Diagnostic Trouble Code (DTC) Table. No GO to AE2.
AE2 CHECK THE EATC MODULE FOR DTCS
Enter the following diagnostic mode on the diagnostic tool: On-Demand Self Test. Were any DTCs retrieved during the on-demand self test?	Yes REFER to Section 412-00 to diagnose the EATC module fault. No GO to AE3.
AE3 CHECK OPERATION OF THE DCSM USING THE DIAGNOSTIC TOOL
Enter the following diagnostic mode on the diagnostic tool: Trigger DCSM Active Command THERMAL ELECTRIC DEVICE (TED) HEAT MODE (driver seat) or PASSENGER THERMAL ELECTRIC DEVICE (TED) HEAT MODE (passenger seat). Enter the following diagnostic mode on the diagnostic tool: Monitor DCSM PID DRIVER DATC STATE ENCODED SEAT MODE or PASSENGER DATC STATE ENCODED SEAT MODE. NOTE: The DCSM active commands THERMAL ELECTRIC DEVICE (TED) HEAT MODE (driver seat) and PASSENGER THERMAL ELECTRIC DEVICE (TED) HEAT MODE (passenger seat) are limited to 15 seconds in the ON state, then turn OFF. NOTE: The DCSM is not the source of the fault if the active command mode is operational and also demonstrates the DCSM is able to receive and process inbound command messages from the communication bus. This indicates the EATC module may not be sending the commands correctly. Monitor the DCSM PID for the affected seat while commanding the active command for that seat ON. Does the affected seat operate using the active command?	Yes GO to AE5. No GO to AE4.
AE4 CHECK FOR VOLTAGE TO THE DCSM
Key in OFF position. Disconnect: DCSM C3305a. Measure the voltage between DCSM C3305a-F, circuit SBB12 (GN/RD), harness side and DCSM C3305a-E, circuit SBB11 (BU/RD), harness side and ground. Is the voltage greater than 10 volts?	Yes INSTALL a new DCSM and CARRY OUT programmable module installation (PMI). REFER to Climate Controlled Seat Module. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No VERIFY battery junction box fuse 12 (30A) and fuse 11 (30A) are OK. If OK, REPAIR the affected circuit. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.
AE5 MONITOR THE DCSM PIDS
Enter the following diagnostic mode on the diagnostic tool: Monitor DCSM PID DRIVER DATC STATE ENCODED SEAT MODE (driver seat) or PASSENGER DATC STATE ENCODED SEAT MODE (passenger seat). NOTE: Operation of the climate controlled seats repeatedly ON and OFF or repeatedly switching between HEAT and COOL modes may cause a DCSM DTCs to set disabling one or both seat system and may require the DTCs to be cleared before seat operation may continue. It is recommended to allow time between modes for seat temperatures to adjust back toward ambient temperatures before continuing. Monitor the DCSM PID for the driver seat while operating the climate controlled seat by selecting high heat, medium heat, low heat and OFF on the EATC module. Then select high cool, medium cool and low cool. Do all the PIDs match climate controlled seat settings selected on the EATC module?	Yes If the fault is intermittent, CHECK for causes of the intermittent fault. INSPECT the connectors, terminals and wiring. ATTEMPT to recreate the fault by flexing the wire harness and operating the system. CHECK the electrical connectors for corrosion or pushed-out pins. REPAIR and intermittent concerns found. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No GO to AE6.
AE6 CHECK THE MS-CAN NETWORK
Enter the following diagnostic mode on the diagnostic tool: Carry Out The Data Links Diagnostics. Did the Data Link Diagnostics test pass?	Yes INSTALL a new EATC module. REFER to Section 412-01. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B. No REFER to Section 418-00 to diagnose the MS-CAN concern. REPEAT the self-test. CLEAR the DTCs. If equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C327 and CONNECT driver seat side air bag module C327. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C313 and CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to Section 501-20B.

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Parts & tools for this job For 2007 Ford Fusion

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