Workshop Manuals Factory service & repair Lincoln
Lincoln Town Car Factory Service Manual (2007)17 · Body
17 · Body & interior

Seats

Make
Lincoln
Model
Town Car Factory Service Manual
Year
2007
Section
501-10 Seating › Diagnosis and testing › Seats
BodySeats

Seats

Section 501-10 · Diagnosis and testing · revised 06/12/2006

Special Tool(s)
Fluke 73 III Automotive Meter 105-R0051 Fluke 73 III Automotive Meter
105-R0051
Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) softwa Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool
Diagnostic Tool, Restraint System (2 required) 418-133 (014-R1076) Diagnostic Tool, Restraint System (2 required)
418-133 (014-R1076)

Restraint System Diagnostic Tool Warning

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.

Principles of Operation

Front Power Seats

The driver and front passenger power seat motors are hardwired to the seat control switches on each respective front door trim panel. The circuits are normally at ground through the seat control switch. Each individual seat track or recliner motor circuit (if equipped) is switched to power when the specific adjustment position is selected.

Memory Seat

The driver power seat is controlled by the driver seat module (DSM). The driver seat control switch circuits are connected to inputs on the driver door module (DDM) and apply fused battery voltage to the DDM inputs. The DDM communicates the seat control switch position by transmitting signal data to the DSM using the SCP communication bus. The received signal data causes the DSM to apply power directly to the appropriate seat motor. Toggling the seat control switch in the opposite direction changes the input to the DDM and the signal transmitted to the DSM causing it to apply power to the opposite seat motor circuit. Ground is the normal state of the motor circuits through the DSM. The DSM internally switches the appropriate circuit from ground to power to adjust 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 seat position sensor.

Memory seat positioning can be recalled with the memory switches on the driver door panel or a programmed remote keyless entry transmitter. In either case, the DSM receives a memory recall 1 or 2 command from the DDM over the SCP communication network. The memory recall switches are a hardwired input to the DDM. The DDM also receives the remote keyless entry transmitter signals. Once a valid memory recall command is received from the DDM, the DSM moves the driver seat to the position stored in memory by powering the appropriate motors and monitoring the motor position sensors until the position is reached.

Heated Seats

Vehicles equipped with front heated seats are equipped with a heated seat module which controls both front heated seats. The heated seat module is located behind the front passenger door trim panel.

Vehicles equipped with rear heated seats are equipped with 2 rear heated seat modules, one for the left rear heated seat and the other for the right rear heated seat. Each rear heated seat module is located underneath the respective rear seat backrest trim cover.

The functionality of both the front and rear heated seat systems is similar. When the heated seat switch is pressed with the ignition switch in RUN, a momentary voltage signal is sent to the heated seat module. The heated seat module then supplies power to the heater circuit. The cushion heater mat and seat backrest heater mat are wired in series and powered by the same output. The heated seat module also will ground the separate indicator circuit at the heated seat switch to indicate an ON state. The front heated seat module will remain on until the heated seat switch is pressed and a momentary voltage signal is received or the ignition switch is set to OFF. The rear heated seat modules will remain on until the heated seat switch is pressed and a momentary voltage signal is received, or until 10 minutes expire. If the ignition source is removed from the module, the heated seat module will enter an OFF state and will not return to ON until the switch is once again pressed with the ignition switch in RUN. The heated seat module is designed to heat the seat to 37.5°C (99.5°F) and maintain the temperature until time-out or switched off. This temperature is maintained by the heated seat module monitoring the temperature sensor located in the seat cushion heater mat, and adjusting the current flow to the heater mats.

Inspection and Verification

  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical and electrical damage.
Visual Inspection Chart
Mechanical Electrical
  • Seat track
  • Recliner(s)
  • Lumbar inflatable bag and hose
  • Open central junction box (CJB) fuse(s):
    • 19 (7.5A)
    • 9 (7.5A)
    • 17 (10A)
  • Open battery junction box (BJB) circuit breaker CB601 (20A)
  • Open BJB fuse(s):
    • 2 (20A)
    • 15 (15A)
    • 16 (20A)
    • 8 (20A)
  • Damaged wiring harness
  • Loose, damaged or corroded connectors
  • Circuitry open/shorted
  • Damaged switches
  • Damaged motors
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    If a concern is noted for power seat horizontal movement of a memory seat system, determine if the power seat track operates correctly by carrying out the following steps:
    1. Disconnect Driver Seat Module (DSM) C341b and driver seat motor C353.
    2. Connect a fused jumper lead between DSM C341b pin 1, circuit 57 (BK), harness side and driver seat motor C353 pin 1, circuit 981 (RD/WH), harness side.
    3. Connect a second fused jumper lead between DSM C341b pin 2, circuit 490 (RD), harness side and driver seat motor C353 pin 4, circuit 980 (YE/WH), harness side, moving the front seat to its full rearward position. Once the seat reaches its full rearward position, remove the fused jumper leads.
    4. Time how long it takes the seat to make full travel by connecting a fused jumper lead between DSM C341b pin 1, circuit 57 (BK), harness side and driver seat motor C353 pin 4, circuit 980 (YE/WH), harness side.
    5. Connect a second fused jumper lead between DSM C341b pin 2, circuit 490 (RD), harness side and driver seat motor C353 pin 1, circuit 981 (RD/WH), harness side, moving the front seat to its full forward position and record the time. Once the seat reaches its full forward position, remove the fused jumper leads.

    6. NOTE: If a seat track motor is inoperative or the front seat track motor assembly is identified as the source of a noise, install a new front seat track motor and transmission assembly. Refer to Seat Track Motor in this section.

      If the travel time is greater than 35 seconds, install a new power seat track. If the travel time is less than 35 seconds, the power seat track operation is acceptable. Reconnect the power seat system and continue with the diagnostic procedure.
  2. If the concern is with the power seat (non-memory seat) or climate controlled seat and the cause is not visually evident, verify the symptom and GO to Symptom Chart.

  3. NOTE: Make sure to use the latest scan tool software release.

    If the concern is with the memory seat and the cause is not visually evident, connect the scan tool to the data link connector (DLC).

  4. 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.
  5. 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).
  6. 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).
  7. Clear the continuous DTCs and carry out the self-test diagnostics for the DSM or the Driver Door Module (DDM).
  8. If the DTCs retrieved are related to the concern, go to DSM or DDM Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to Section 419-10.
  9. If no DTCs related to the concern are retrieved, GO to Symptom Chart.
DRIVER DOOR MODULE (DDM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX

NOTE: DTCs shown are specific to seating diagnostic Pinpoint Tests. For additional DDM DTCs refer to Section 419-10.
DTC Logged As Description DTC retrieved from Action to Take
B1342 Continuous, On-Demand ECU Is Faulted DDM INSTALL a new DDM.
B1529 Continuous, On-Demand Memory Set Switch Circuit Short to Battery DDM REFER to Section 501-09.
B1533 Continuous, On-Demand Memory 1 Switch Circuit Short To Battery DDM REFER to Section 501-09.
B1537 Continuous, On-Demand Memory 1 Switch Circuit Short To Battery DDM REFER to Section 501-09.
B2147 Continuous, On-Demand Driver Seat Switch Fault DDM Go To Pinpoint Test A.
B2373 Continuous, On-Demand LED #1 Circuit Failure DDM REFER to Section 501-09.
C1920 Continuous, On-Demand LED #1 Circuit Short To Battery DDM REFER to Section 501-09.
DRIVER SEAT MODULE (DSM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX

NOTE: DTCs shown are specific to seating diagnostic Pinpoint Tests. For additional DSM DTCs refer to Section 419-10.
DTC Logged As Description DTC retrieved from Action to Take
B1342 Continuous, On-Demand ECU Is Faulted DSM INSTALL a new DSM.
B1663 On-Demand Seat Driver Front Up/Down Motor Stalled DSM Go To Pinpoint Test A.
B1664 On-Demand Seat Driver Rear Up/Down Motor Stalled DSM Go To Pinpoint Test A.
B1665 On-Demand Seat Driver Forward/Backward Motor Stalled DSM Go To Pinpoint Test A.
B1666 On-Demand Seat Driver Recline Motor Stalled DSM Go To Pinpoint Test A.
B1676 Continuous, On-Demand Battery Voltage Out Of Range DSM Go To Pinpoint Test W.
B1950 Continuous, On-Demand Seat Rear Up/Down Position Feedback Circuit Failure DSM Go To Pinpoint Test G.
B1953 Continuous, On-Demand Seat Rear Up/Down Position Feedback Circuit Short To Ground DSM Go To Pinpoint Test G.
B1954 Continuous, On-Demand Seat Front Up/Down Position Feedback Circuit Failure DSM Go To Pinpoint Test G.
B1957 Continuous, On-Demand Seat Front Up/Down Position Feedback Circuit Short To Ground DSM Go To Pinpoint Test G.
B1958 Continuous, On-Demand Seat Recline Forward/Backward Position Feedback Circuit Failure DSM Go To Pinpoint Test G.
B1961 Continuous, On-Demand Seat Recline Forward/Backward Position Feedback Circuit Short To Ground DSM Go To Pinpoint Test G.
B1962 Continuous, On-Demand Seat Horizontal Forward/Rearward Position Feedback Circuit Failure DSM Go To Pinpoint Test G.
B1965 Continuous, On-Demand Seat Horizontal Forward/Rearward Position Feedback Circuit Short To Ground DSM Go To Pinpoint Test G.

Symptom Chart

SYMPTOM CHART
Condition Possible Sources Action
  • No communication with the driver door module (DDM)
  • Fuse
  • Circuitry
  • Driver door module
  • No communication with the driver seat module (DSM)
  • Fuse
  • Circuitry
  • Driver seat module
  • The power seat moves but is noisy
  • Obstruction or foreign material
  • IDENTIFY the source of the noise. If an obstruction or foreign material is found, REMOVE the obstruction or foreign material.
  • Front seat track motor assembly
  • If the source of the noise is a front seat track motor, INSTALL a new front seat track motor assembly. REFER to Seat Track Motor in this section.
  • Seat track
  • If the source of the noise is the front seat track (and not the front seat track motor assembly), INSTALL a new front seat track assembly. REFER to Seat Track in this section.
  • The memory seat is inoperative/does not operate correctly
  • Fuse
  • Circuitry
  • Driver seat control switch
  • Memory seat position sensor
  • Driver front seat track motor assembly
  • Driver front seat track
  • Driver seat module
  • Driver door module
  • The power seat is inoperative — driver
  • Fuse
  • Circuitry
  • Driver seat control switch
  • The power seat is inoperative — passenger
  • Fuse
  • Circuitry
  • Passenger seat control switch
  • The memory seat does not operate correctly — motors operate in one-second intervals or memory seat recall not functioning correctly
  • Circuitry
  • Memory seat position sensor
  • Driver seat module
  • The memory seat does not operate correctly — seat does not move horizontally/vertically/recline
  • Circuitry
  • Driver seat control switch
  • Driver seat module
  • Driver door module
  • The power seat does not move horizontally/vertically/recline — driver
  • Circuitry
  • Driver seat control switch
  • Recline motor
  • Driver front seat track motor and transmission assembly
  • Driver front seat track
  • The power seat does not move horizontally/vertically/recline — passenger
  • Circuitry
  • Passenger seat control switch
  • Recline motor
  • Passenger front seat track motor and transmission assembly
  • Passenger front seat track
  • The memory seat does not operate correctly — seat recall feature is inoperative/does not operate correctly
  • Circuitry
  • Driver seat module
  • Easy exit/easy entry does not operate correctly
  • Circuitry
  • Driver seat module
  • Lighting control module
  • The heated seat is inoperative — driver
  • Fuse
  • Circuitry
  • Heated seat switch
  • Seat cushion heater mat
  • Seat backrest heater mat
  • Heated seat module
  • The heated seat is inoperative — passenger
  • Fuse
  • Circuitry
  • Heated seat switch
  • Seat cushion heater mat
  • Seat backrest heater mat
  • Heated seat module
  • The heated seat is inoperative — driver, does not operate in high
  • Circuitry
  • Heated seat switch
  • Heated seat module
  • The heated seat is inoperative — driver, does not operate in low
  • Circuitry
  • Heated seat switch
  • Heated seat module
  • The heated seat is inoperative — passenger, does not operate in high
  • Circuitry
  • Heated seat switch
  • Heated seat module
  • The heated seat is inoperative — passenger, does not operate in low
  • Circuitry
  • Heated seat switch
  • Heated seat module
  • The heated seat is inoperative — left rear
  • Fuse
  • Circuitry
  • Heated seat switch
  • Seat cushion heater mat
  • Seat backrest heater mat
  • Heated seat module
  • The heated seat is inoperative — right rear
  • Fuse
  • Circuitry
  • Heated seat switch
  • Seat cushion heater mat
  • Seat backrest heater mat
  • Heated seat module
  • The heated seat is inoperative — left rear, does not operate in high
  • Circuitry
  • Heated seat switch
  • Heated seat module
  • The heated seat is inoperative — left rear, does not operate in low
  • Circuitry
  • Heated seat switch
  • Heated seat module
  • The heated seat is inoperative — right rear, does not operate in high
  • Circuitry
  • Heated seat switch
  • Heated seat module
  • The heated seat is inoperative — right rear, does not operate in low
  • Circuitry
  • Heated seat switch
  • Heated seat module
  • The power lumbar is inoperative — both driver and passenger
  • Fuse
  • Circuitry
  • VERIFY battery junction box (BJB) fuse 15 (15A) is OK. If OK, CHECK circuit 566 (DG) for an open. REPAIR as necessary.
  • The power lumbar is inoperative — driver
  • Fuse
  • Circuitry
  • Lumbar control switch
  • Lumbar motor
  • The power lumbar is inoperative — passenger
  • Circuitry
  • Lumbar control switch
  • Lumbar motor
  • The 20 percent front seat backrest will not fold down
  • Armrest locking pin is activated

Pinpoint Tests

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

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

Pinpoint Test A: The Memory Seat Is Inoperative/Does Not Operate Correctly

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

Refer to Wiring Diagrams Cell 57, Driver Door Module for schematic and connector information.

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

Normal Operation

The power seat is powered by battery voltage to driver seat control switch circuit 1524 (DB) and ground on circuit 57 (BK) to the switch. When pressed, the power seat switch supplies voltage to the appropriate driver door module (DDM) seat control switch input circuit. The DDM transmits the driver seat control switch input data to the driver seat module using the SCP communication bus. The driver seat module (DSM) receives the input signals and then supplies voltage and ground to the appropriate power seat track motor or recliner circuits. The DSM will reverse the motor circuit polarity to operate the seat track or recliner motor in the opposite direction.

The DSM is powered by battery voltage to circuit 490 (RD), and to circuit 1524 (DB), ground to circuit 57 (BK) and ground to circuit 676 (PK/OG).

A 3-lead sensor is attached to each motor on the memory seat track and recliner assembly. The sensor circuits are connected to the driver seat module (DSM) which supplies the sensor power and receives the sensor signals. The DSM receives data from the memory seat position sensors to monitor the positions of the seat track and recliner motors. This motor position data is stored when the DSM receives a SET switch input signal and recalled when it receives a RECALL switch input signal. The driver door module (DDM) is directly connected to the memory SET/RECALL switch and transmits the switch signal data to the DSM using the SCP communication bus. The DSM also receives memory recall signals from the remote transmitter over the SCP communication bus transmitted by the lighting control module (LCM).

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 motor.
  • a faulty DSM.

PINPOINT TEST A: THE MEMORY SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

NOTE: Make sure the battery is in good condition and fully charged before carrying out diagnostics.

Test Step Result / Action to Take
A1 CHECK FOR DRIVER DOOR MODULE (DDM) 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Enter the following diagnostic mode on the diagnostic tool: Driver Door Module (DDM) On-Demand Self Test.
  • Is DDM DTC B2147 present?
 Yes
GO to A4.

No
GO to A2.
A2 CHECK FOR DRIVER SEAT MODULE (DSM) DTCS
  • Enter the following diagnostic mode on the diagnostic tool: Driver Seat Module (DSM) On-Demand Self Test.
  • Are any DSM DTCs present?
 Yes
If DTC B1663 was retrieved, GO to A15 .

If DTCs B1663 and B1957 were retrieved, Go To Pinpoint Test D.

If DTCs B1663 and B1954 were retrieved, Go To Pinpoint Test D.

If DTC B1664 was retrieved, GO to A20 .

If DTCs B1664 and B1953 were retrieved, Go To Pinpoint Test D.

If DTCs B1664 and B1950 were retrieved, Go To Pinpoint Test D.

If DTC B1665 was retrieved, GO to A25 .

If DTCs B1665 and B1965 were retrieved, Go To Pinpoint Test D.

If DTCs B1665 and B1962 were retrieved, Go To Pinpoint Test D.

If DTC B1666 was retrieved, GO to A31 .

If DTCs B1666 and B1961 were retrieved, Go To Pinpoint Test D.

If DTCs B1666 and B1958 were retrieved, Go To Pinpoint Test D.

If DTCs B1663, B1664, B1665 and B1666 are all retrieved, GO to A8 .

If DTCs B1667, B1668, B1669 and B1670 are all retrieved, Go To Pinpoint Test D.

If DTC B1676 is retrieved, Go To Pinpoint Test W.

For all others, REFER to the Diagnostic Trouble Code (DTC) Index in Section 419-10 to diagnose the concern.

No
GO to A3.
A3 CHECK THE DDM POWER SEAT CONTROL SWITCH INPUTS
  • Enter the following diagnostic mode on the diagnostic tool: Monitor PIDs.
  • Monitor the DDM seat control switch position PIDs while operating the driver seat control switch in all positions.
  • Do the DDM PID values agree with the driver seat control switch positions?
 Yes
GO to A8.

No
GO to A4.
A4 CHECK THE DRIVER SEAT CONTROL SWITCH
  • Remove the driver seat control switch.
  • Carry out the driver seat control switch component test.

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

  • Did the driver seat control switch pass?
 Yes
GO to A5.

No
INSTALL a new driver seat control switch. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A5 CHECK FOR POWER AT THE DRIVER SEAT CONTROL SWITCH
  • Measure the voltage between driver seat control switch C545-4, circuit 1524 (DB), harness side and ground.
    • Yes GO to A6 . No VERIFY CJB fuse 19 (7.5A) is OK. If OK, REPAIR circuit 1524 (D
  • Is the voltage greater than 10 volts?
 Yes
GO to A6.

No
VERIFY CJB fuse 19 (7.5A) is OK. If OK, REPAIR circuit 1524 (DB). REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A6 CHECK CIRCUITS 983 (RD/LG), 982 (YE/LG), 918 (GY), 919 (GY/BK), 979 (RD/LB), 978 (YE/LB), 981 (RD/WH) AND 980 (YE/WH) FOR A SHORT TO POWER
  • Disconnect: DDM C501a.
  • Measure the voltage between the following seat control switch C545 pins, harness side and ground.
    • Connector — Pin Circuit
    C545-2 981 (RD/WH)
    C545-12 983 (RD/LG)
    C545-3 979 (RD/LB)
    C545-14 918 (GY)
    C545-1 980 (YE/WH)
    C545-6 982 (YE/LG)
    C545-5 978 (YE/LB)
    C545-16 919 (GY/BK)
    Yes GO to A7 . No REPAIR the affected circuit for a short to power. REPEAT the s
  • Are the voltages less than 0.2 volt?
 Yes
GO to A7.

No
REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A7 CHECK CIRCUITS 983 (RD/LG), 982 (YE/LG), 918 (GY), 919 (GY/BK), 979 (RD/LB), 978 (YE/LB), 981 (RD/WH) AND 980 (YE/WH) FOR AN OPEN CIRCUIT
  • Measure the resistance between the following DDM C501a pins, harness side and seat control switch C545 pins, harness side.
    • DDM Connector — Pin Seat Control Switch Connector — Pin Circuit
    C501a-13 C545-2 981 (RD/WH)
    C501a-15 C545-12 983 (RD/LG)
    C501a-19 C545-3 979 (RD/LB)
    C501a-17 C545-14 918 (GY)
    C501a-8 C545-1 980 (YE/WH)
    C501a-16 C545-6 982 (YE/LG)
    C501a-20 C545-5 978 (YE/LB)
    C501a-18 C545-16 919 (GY/BK)
    Yes INSTALL a new DDM. REFER to Section 419-10 for additional information. REPEA
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new DDM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A8 CHECK THE DRIVER SEAT OPERATION
  • Use the driver seat control switch to move the driver seat in each direction for full travel.
  • Does the driver seat move in one-second intervals?
 Yes
Go To Pinpoint Test D.

No
GO to A9.
A9 CHECK THE DSM OUTPUTS
  • Select PARK.
  • Enter the following diagnostic mode on the diagnostic tool: Active Commands.
  • Operate the seat motors in all directions using each of the DSM driver seat output control active commands.
  • Do all driver seat motors respond correctly using the active commands?
 Yes
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
If there is no seat movement, GO to A10 .

If there is no front up/down seat movement, GO to A15 .

If there is no rear up/down seat movement, GO to A20 .

If there is no horizontal seat movement, GO to A25 .

If there is no recline seat movement, GO to A31 .
A10 CHECK FOR VOLTAGE TO THE DSM
  • Disconnect: DSM C341b.
  • Measure the voltage between DSM C341b-2, circuit 490 (RD), harness side and ground.
    • Yes GO to A11 . No VERIFY BJB CB601 (20A) is OK. If OK, REPAIR circuit 490 (RD)
  • Is the voltage greater than 10 volts?
 Yes
GO to A11.

No
VERIFY BJB CB601 (20A) is OK. If OK, REPAIR circuit 490 (RD) for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A11 CHECK CIRCUIT 57 (BK) FOR AN OPEN
  • Measure the resistance between DSM C341b-1, circuit 57 (BK), harness side and ground.
    • Yes GO to A12 . No REPAIR circuit 57 (BK) for an open. REPEAT the self-test, CLE
  • Is the resistance less than 5 ohms?
 Yes
GO to A12.

No
REPAIR circuit 57 (BK) for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A12 CHECK CIRCUITS 979 (RD/LB), 978 (YE/LB), 983 (RD/LG), 982 (YE/LG), 980 (YE/WH) AND 981 (RD/WH) FOR A SHORT TO GROUND
  • Disconnect: DSM C341a.
  • Disconnect: Driver Seat Motor C353.
  • Measure the resistance between the following DSM C341a pins, harness side and ground.
    • Connector — Pin Circuit
    C341a-16 980 (YE/WH)
    C341a-5 982 (YE/LG)
    C341a-6 978 (YE/LB)
    C341a-1 979 (RD/LB)
    C341a-3 983 (RD/LG)
    C341a-4 981 (RD/WH)
    Yes LEAVE all seat motors disconnected and GO to A13 . No REPAIR the affected ci
  • Are the resistances greater than 10,000 ohms?
 Yes
LEAVE all seat motors disconnected and GO to A13 .

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A13 CHECK CIRCUITS 919 (GY/BK) AND 918 (GY) FOR A SHORT TO GROUND
  • Disconnect: Driver Seat Recline Motor C368.
  • Measure the resistance between DSM C341a-15, circuit 919 (GY/BK), harness side and ground; and between DSM C341a-2, circuit 918 (GY), harness side and ground.
    • Yes GO to A14 . No REPAIR the affected circuit for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to A14.

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A14 CHECK THE RECLINE MOTOR FOR A SHORT TO GROUND
  • Connect: Driver Seat Recline Motor C368.
  • Connect: DSM C341a.
  • Use the driver seat control switch to recline the seat back FORWARD and REARWARD through its full travel.
  • Does the seat recline motor operate in all positions correctly?
 Yes
INSTALL a new driver seat track motor and transmission assembly. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new seat recline motor assembly. REFER to Seat Recliner — Power in this section. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A15 CHECK THE FRONT SEAT HEIGHT MOTOR FOR CORRECT OPERATION
  • Disconnect: Driver Seat Motor C353.
  • Enter the following diagnostic mode on the diagnostic tool: Active Commands.
  • Select the DSM driver seat output control active commands.
  • Connect the volt meter between power driver seat motor assembly C353-3, circuit 979 (RD/LB), harness side and C353-2, circuit 978 (YE/LB), harness side.
    • Yes GO to A16 . No GO to A19 .
  • Toggle the DSM driver seat front height motor outputs UP and DOWN using the active commands and measure the voltages.
  • Is the voltage greater than +10 volts when commanded UP, greater than -10 volts when commanded DOWN and 0 volts when idle?
 Yes
GO to A16.

No
GO to A19.
A16 CHECK THE FRONT HEIGHT POSITION SENSOR CIRCUITS 443 (LG/RD), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO POWER
  • Disconnect: DSM C341a.
  • Disconnect: Front Height Position Sensor C383.
  • Key in ON position.
  • Measure the voltage between driver seat front height position sensor C383-2, circuit 443 (LG/RD), harness side and ground; C383-1, circuit 446 (OG/WH), harness side and ground; and C383-3, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to A17 . No REPAIR the affected circuit for a short to power. REPEAT the
  • Are the voltages less than 0.2 volt?
 Yes
GO to A17.

No
REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A17 CHECK THE FRONT HEIGHT POSITION SENSOR CIRCUITS 443 (LG/RD), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO GROUND
  • Key in OFF position.
  • Measure the resistance between driver seat front height position sensor C383-2, circuit 443 (LG/RD), harness side and ground; C383-1, circuit 446 (OG/WH), harness side and ground; and C383-3, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to A18 . No REPAIR the affected circuit for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to A18.

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A18 CHECK THE FRONT HEIGHT POSITION SENSOR CIRCUITS 443 (LG/RD), 446 (OG/WH) AND 447 (OG/RD) FOR AN OPEN
  • Measure the resistance between the DSM C341a pins, harness side and driver seat front height position sensor C383 pins, harness side.
    • DSM Connector — Pin Height Sensor Connector — Pin Circuit
    C341a-10 C383-2 443 (LG/RD)
    C341a-9 C383-1 446 (OG/WH)
    C341a-7 C383-3 447 (OG/RD)
    Yes INSTALL a new seat front height position sensor. REFER to Memory Seat Positi
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new seat front height position sensor. REFER to Memory Seat Position Sensor in this section. GO to A33 .

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A19 CHECK CIRCUITS 979 (RD/LB) AND 978 (YE/LB) FOR AN OPEN
  • Disconnect: DSM C341a.
  • Measure the resistance between DSM C341-12, circuit 979 (RD/LB), harness side and power seat motor assembly C353-3, circuit 979 (RD/LB), harness side; and between DSM C341a-6, circuit 978 (YE/LB), harness side and power seat motor assembly C353-2, circuit 978 (YE/LB), harness side.
    • Yes INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEA
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A20 CHECK THE REAR HEIGHT MOTOR FOR CORRECT OPERATION
  • Disconnect: Driver Seat Motor C353.
  • Enter the following diagnostic mode on the diagnostic tool: Active Commands.
  • Select the DSM driver seat output control active commands.
  • Connect the volt meter between power seat motor assembly C353-5, circuit 983 (RD/LG), harness side and C353-6, circuit 982 (YE/LG), harness side.
    • Yes GO to A21 . No GO to A24 .
  • Toggle the DSM driver seat rear height motor outputs UP and DOWN using the active commands and measure the voltages.
  • Is the voltage greater than +10 volts when commanded UP, greater than -10 volts when commanded DOWN and 0 volts when idle?
 Yes
GO to A21.

No
GO to A24.
A21 CHECK THE REAR HEIGHT POSITION SENSOR CIRCUITS 444 (LG/BK), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO POWER
  • Disconnect: DSM C341a.
  • Disconnect: Rear Height Position Sensor C373.
  • Key in ON position.
  • Measure the voltage between driver seat rear height position sensor C373-2, circuit 444 (LG/BK), harness side and ground; C373-3, circuit 446 (OG/WH), harness side and ground; and C373-1, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to A22 . No REPAIR the affected circuit for a short to power. REPEAT the
  • Is the voltage less than 0.2 volt?
 Yes
GO to A22.

No
REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A22 CHECK THE REAR HEIGHT POSITION SENSOR CIRCUITS 444 (LG/BK), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO GROUND
  • Key in OFF position.
  • Measure the resistance between driver seat rear height position sensor C373-2, circuit 444 (LG/BK), harness side and ground; C373-3, circuit 446 (OG/WH), harness side and ground; and C373-1, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to A23 . No REPAIR the affected circuit for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to A23.

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A23 CHECK THE REAR HEIGHT POSITION SENSOR CIRCUITS 444 (LG/BK), 446 (OG/WH) AND 447 (OG/RD) FOR AN OPEN
  • Measure the resistance between DSM C341a pins, harness side and driver seat rear height sensor C373 pins, harness side.
    • DSM Connector — Pin Height Sensor Connector — Pin Circuit
    C341a-11 C373-2 444 (LG/BK)
    C341a-9 C373-3 446 (OG/WH)
    C341a-7 C373-1 447 (OG/RD)
    Yes INSTALL a new driver seat rear height position sensor. REFER to Memory Seat
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new driver seat rear height position sensor. REFER to Memory Seat Position Sensor in this section. GO to A33 .

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A24 CHECK CIRCUITS 983 (RD/LG) AND 982 (YE/LG) FOR AN OPEN
  • Disconnect: DSM C341a.
  • Measure the resistance between DSM C341a-3, circuit 983 (RD/LG), harness side and power seat motor assembly C353-5, circuit 983 (RD/LG), harness side; and between DSM C341a-5, circuit 982 (YE/LG), harness side and power seat motor assembly C353-6, circuit 982 (YE/LG), harness side.
    • Yes INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEA
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A25 CHECK THE HORIZONTAL MOTOR FOR CORRECT OPERATION
  • Disconnect: Driver Seat Motor C353.
  • Enter the following diagnostic mode on the diagnostic tool: Active Commands.
  • Select the DSM driver seat output control active commands.
  • Connect the volt meter between power seat motor assembly C353-4, circuit 980 (YE/WH), harness side and C353-1, circuit 981 (RD/WH), harness side.
    • Yes GO to A26 . No GO to A30 .
  • Toggle the DSM driver seat horizontal motor outputs FORWARD and REARWARD using the active commands and measure the voltages.
  • Is the voltage greater than +10 volts when commanded FORWARD, greater than -10 volts when commanded REARWARD and 0 volts when idle?
 Yes
GO to A26.

No
GO to A30.
A26 CHECK THE HORIZONTAL POSITION SENSOR CIRCUITS 442 (LG/OG), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO POWER
  • Disconnect: DSM C341a.
  • Disconnect: Horizontal Position Sensor C372.
  • Key in ON position.
  • Measure the voltage between driver seat horizontal position sensor C372-2, circuit 442 (LG/OG), harness side and ground; C372-3, circuit 446 (OG/WH), harness side and ground; and C372-1, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to A27 . No REPAIR the affected circuit for a short to power. REPEAT the
  • Are the voltages less than 0.2 volt?
 Yes
GO to A27.

No
REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A27 CHECK THE HORIZONTAL POSITION SENSOR CIRCUITS 442 (LG/OG), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO GROUND
  • Key in OFF position.
  • Measure the resistance between driver seat horizontal position sensor C372-2, circuit 442 (LG/OG), harness side and ground; C372-3, circuit 446 (OG/WH), harness side and ground; and C372-1, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to A28 . No REPAIR the affected circuit for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to A28.

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A28 CHECK THE HORIZONTAL POSITION SENSOR CIRCUITS 442 (LG/OG), 446 (OG/WH) AND 447 (OG/RD) FOR AN OPEN
  • Measure the resistance between DSM C341a pins, harness side and driver seat horizontal position sensor C372 pins, harness side.
    • DSM Connector — Pin Sensor Connector — Pin Circuit
    C341a-8 C372-2 442 (LG/OG)
    C341a-9 C372-3 446 (OG/WH)
    C341a-7 C372-1 447 (OG/RD)
    Yes GO to A29 . No REPAIR the affected circuit for an open. REPEAT the self-test
  • Are the resistances less than 5 ohms?
 Yes
GO to A29.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A29 CHECK THE SEAT TRACK OPERATION
  • Disconnect: DSM C341b.
  • Connect a fused jumper lead between DSM C341b-1, circuit 57 (BK), harness side and driver seat motor C353-1, circuit 981 (RD/WH), harness side; connect a second fused jumper lead between DSM C341b-2, circuit 490 (RD), harness side and driver seat motor C353-4, circuit 980 (YE/WH), harness side, moving the front seat to its full REARWARD position. Once the seat reaches its full REARWARD position, remove the fused jumper leads.
    • Yes INSTALL a new horizontal memory seat position sensor. REFER to Memory Seat P
  • Time how long it takes the seat to make full travel by connecting a fused jumper lead between DSM C341b-1, circuit 57 (BK), harness side and driver seat motor C353-4, circuit 980 (YE/WH), harness side; connect a second fused jumper lead between DSM C341b-2, circuit 490 (RD), harness side and driver seat motor C353-1, circuit 981 (RD/WH), harness side, moving the front seat to its full FORWARD position and record the time. Once the seat reaches its full FORWARD position, remove the fused jumper leads.
    • Yes INSTALL a new horizontal memory seat position sensor. REFER to Memory Seat P
  • Did the seat travel from full REARWARD to full FORWARD in less than 35 seconds?
 Yes
INSTALL a new horizontal memory seat position sensor. REFER to Memory Seat Position Sensor in this section. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new driver seat track motor and transmission assembly. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A30 CHECK CIRCUITS 980 (YE/WH) AND 981 (RD/WH) FOR AN OPEN
  • Disconnect: DSM C341a.
  • Measure the resistance between DSM C341a-16, circuit 980 (YE/WH), harness side and power seat motor assembly C353-4, circuit 980 (YE/WH), harness side; and between DSM C341a-4, circuit 981 (RD/WH), harness side and power seat motor assembly C353-1, circuit 981 (RD/WH), harness side.
    • Yes INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEA
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A31 CHECK THE POWER SEAT RECLINE MOTOR FOR CORRECT OPERATION
  • Disconnect: Driver Seat Recline Motor C368.
  • Enter the following diagnostic mode on the diagnostic tool: Active Commands.
  • Select the DSM driver seat output control active commands.
  • Connect the volt meter between driver seat recline motor C368, circuit 919 (GY/BK) and C368, circuit 918 (GY), harness side.
    • Yes INSTALL a new power seat recline motor. REFER to Seat Recliner — Power in th
  • Toggle the DSM driver seat recliner motor outputs FORWARD and REARWARD using the active commands and measure the voltages.
  • Is the voltage greater than +10 volts when commanded FORWARD, greater than -10 volts when commanded REARWARD and 0 volts when idle?
 Yes
INSTALL a new power seat recline motor. REFER to Seat Recliner — Power in this section. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to A32.
A32 CHECK CIRCUITS 919 (GY/BK) AND 918 (GY) FOR AN OPEN
  • Disconnect: DSM C341a.
  • Measure the resistance between DSM C341a-15, circuit 919 (GY/BK), harness side and driver seat recline motor C368, circuit 919 (GY/BK), harness side; and between DSM C341a-2, circuit 918 (GY), harness side and driver seat recline motor C368, circuit 918 (GY), harness side.
    • Yes INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEA
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
A33 CHECK THE SEAT FOR NORMAL OPERATION
  • Connect: Memory/Driver Seat Connectors.
  • Test the memory seat for normal operation.
  • Does the memory seat operate correctly?
 Yes
The system is operating correctly at this time. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new driver seat track motor and transmission assembly. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test B: The Power Seat Is Inoperative — Driver

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

Normal Operation

The seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). The seat control switch applies battery power and ground directly to the appropriate seat track motor or recliner motor, to move the seat.

Possible Causes

An inoperative driver power seat can be caused by:

  • a faulty circuit breaker.
  • wiring, terminals or connectors.
  • a faulty seat control switch.
  • a faulty seat track.

PINPOINT TEST B: THE POWER SEAT IS INOPERATIVE — DRIVER

Test Step Result / Action to Take
B1 CHECK FOR SWITCH OUTPUT
    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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Driver Seat Control Switch C519.
  • Measure the voltage between the driver seat control switch C519-11, circuit 490 (RD), harness side and ground.
    • Yes GO to B2 . No VERIFY BJB circuit breaker 601 (20A) is OK. If OK, REPAIR driv
  • Is the voltage greater than 10 volts?
 Yes
GO to B2.

No
VERIFY BJB circuit breaker 601 (20A) is OK. If OK, REPAIR driver circuit 490 (RD). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
B2 CHECK THE SWITCH GROUND
  • Measure the resistance between the driver seat control switch C519-7, circuit 57 (BK), harness side and ground.
    • Yes INSTALL a new seat control switch. TEST the system for normal operation. DIS
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR circuit 57 (BK) for an open. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. 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 seat control switch is powered by battery voltage to circuit 490 (RD) and is supplied ground on circuit 57 (BK). The seat control switch applies battery power and ground directly to the appropriate seat track motor or recliner motor, to move the seat.

Possible Causes

An inoperative passenger power seat can be caused by:

  • a faulty circuit breaker.
  • wiring, terminals or connectors.
  • a faulty seat control switch.
  • a faulty seat track.

PINPOINT TEST C: THE POWER SEAT IS INOPERATIVE — PASSENGER

Test Step Result / Action to Take
C1 CHECK FOR SWITCH OUTPUT
    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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Passenger Seat Side Air Bag C316.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Passenger Seat Side Air Bag C316.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Passenger Seat Control Switch C627.
  • Measure the voltage between the passenger seat control switch C627-11, circuit 490 (RD), harness side and ground.
    • Yes GO to C2 . No VERIFY BJB circuit breaker 601 (20A) is OK. If OK, REPAIR pass
  • Is the voltage greater than 10 volts?
 Yes
GO to C2.

No
VERIFY BJB circuit breaker 601 (20A) is OK. If OK, REPAIR passenger circuit 490 (RD). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
C2 CHECK THE SWITCH GROUND
  • Measure the resistance between passenger seat control switch C627-7, circuit 57 (BK), harness side and ground.
    • Yes INSTALL a new seat control switch. TEST the system for normal operation. No
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new seat control switch. TEST the system for normal operation.

No
REPAIR circuit 57 (BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test D: The Memory Seat Does Not Operate Correctly — Motors Operate In One Second Intervals Or Memory Seat Recall Not Functioning Correctly

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

Refer to Wiring Diagrams Cell 57, Driver Door Module for schematic and connector information.

Normal Operation

The memory seat recall feature should operate the seat track and recliner motors smoothly to their preset positions when a stored driver 1 or 2 memory recall selection is activated. The recall can be activated by either the memory seat position switch or the remote keyless entry transmitter (key FOB). When activated, the DSM will apply power to each of the seat motors as needed to move the seat to the preset positions. The DSM monitors input signals from each of the memory seat position sensors to calculate each of the motors positions and will remove power from each motor once the calibrated position is attained. A missing sensor signal or faulty motor may cause the seat to operate in a pulsating manner (one-second intervals) or to become inoperative.

Possible Causes

An inoperative memory recall feature or a memory seat motor that cycles in one-second intervals may be caused by:

  • wiring, terminals or connectors.
  • a faulty memory seat position sensor.
  • a faulty memory seat position switch.
  • a faulty seat track motor.
  • a faulty DSM.

PINPOINT TEST D: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY — MOTORS OPERATE IN ONE SECOND INTERVALS OR MEMORY SEAT RECALL NOT FUNCTIONING CORRECTLY

NOTE: Make sure the battery is in good condition and fully charged before carrying out diagnostics.

Test Step Result / Action to Take
D1 CHECK THE POWER SEAT 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Select PARK.
  • NOTE: The driver seat may move in one-second intervals.
  • Operate the driver seat in all directions using the driver seat control switch.
  • Does the driver seat operate in all directions?
 Yes
GO to D2.

No
GO to Symptom Chart to diagnose the inoperative seat function.
D2 CHECK FOR DRIVER DOOR MODULE (DDM) DTCS
  • Use the recorded results from the driver door module (DDM) self-test.
  • Are any DDM DTCs recorded?
 Yes
For DTC(s) B1703, B1707, B1711, B1715, B1719, B1723, B1727 or B1731, Go To Pinpoint Test A.

For all others, REFER to the Diagnostic Trouble Code (DTC) Index in Section 419-10 to diagnose the DDM concern.

No
GO to D3.
D3 CHECK FOR DRIVER SEAT MODULE (DSM) DTCS
  • Use the recorded results from the driver seat module (DSM) self-test.
  • Are any DSM DTCs recorded?
 Yes
If DTCs B1663 and B1957 were retrieved, GO to D5 .

If DTCs B1663 and B1954 were retrieved, GO to D6 .

If DTCs B1664 and B1953 were retrieved, GO to D8 .

If DTCs B1664 and B1950 were retrieved, GO to D9 .

If DTCs B1665 and B1965 were retrieved, GO to D11 .

If DTCs B1665 and B1962 were retrieved, GO to D12 .

If DTCs B1666 and B1961 were retrieved, GO to D14 .

If DTCs B1666 and B1958 were retrieved, GO to D15 .

If DTCs B1663, B1664, B1665 and B1966 are all retrieved, GO to D4 .

If DTCs B1663, B1664, B1665, B1666, B1667, B1668, B1669 and B1670 are all retrieved, GO to D17 .

If DTC B1676 is retrieved, Go To Pinpoint Test W.

For all others, REFER to the Diagnostic Trouble Code (DTC) Index in Section 419-10 to diagnose the DSM concern.

No
GO to D4.
D4 CHECK THE DSM FOR THE CORRECT OUTPUTS
  • Select PARK.
  • Place the seat in a central position using the driver seat control switch. Using the driver seat control switch, operate the seat as follows:
    • Move the driver seat front UP and DOWN throughout its complete travel.
    • Move the driver seat rear UP and DOWN throughout its complete travel.
    • Move the driver seat horizontally FORWARD and REARWARD throughout its complete travel.
    • Move the driver seat recline FORWARD and REARWARD throughout its complete travel.
  • Do all the seat motors complete the full travel without stopping?
 Yes
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
If all the driver seat motors do not operate correctly, GO to D17 .

If the driver seat front height motor is not operating correctly, GO to D5 .

If the driver seat rear height motor is not operating correctly, GO to D8 .

If the driver seat horizontal motor is not operating correctly, GO to D11 .

If the driver seat recline motor is not operating correctly, GO to D14 .
D5 CHECK THE FRONT HEIGHT POSITION SENSOR CIRCUITS 443 (LG/RD), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO GROUND
  • Disconnect: DSM C341a.
  • Disconnect: Front Height Position Sensor C383.
  • Measure the resistance between driver seat front height position sensor C383-2, circuit 443 (LG/RD), harness side and ground; C383-1, circuit 446 (OG/WH), harness side and ground; and C383-3, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to D6 . No REPAIR the affected circuit for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to D6.

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D6 CHECK CIRCUITS 443 (LG/RD), 446 (OG/WH) AND 447 (OG/RD) FOR AN OPEN
  • Key in OFF position.
  • Measure the resistance between DSM C341a pins, harness side and driver seat front height position sensor C383 pins, harness side.
    • DSM Connector — Pin Height Sensor Connector — Pin Circuit
    C341a-10 C383-2 443 (LG/RD)
    C341a-9 C383-1 446 (OG/WH)
    C341a-7 C383-3 447 (OG/RD)
    Yes GO to D7 . No REPAIR the affected circuit for an open. REPEAT the self-test,
  • Are the resistances less than 5 ohms?
 Yes
GO to D7.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D7 CHECK CIRCUITS 443 (LG/RD), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO POWER
  • Key in ON position.
  • Measure the voltage between driver seat front height position sensor C383-2, circuit 443 (LG/RD), harness side and ground; C383-1, circuit 446 (OG/WH), harness side and ground; and C383-3, circuit 447 (OG/RD), harness side and ground.
    • Yes REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEA
  • Is voltage present?
 Yes
REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to D21.
D8 CHECK THE REAR HEIGHT POSITION SENSOR CIRCUITS 444 (LG/BK), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO GROUND
  • Disconnect: DSM C341a.
  • Disconnect: Rear Height Position Sensor C373.
  • Measure the resistance between driver seat rear height position sensor C373-2, circuit 444 (LG/BK), harness side and ground; C373-3, circuit 446 (OG/WH), harness side and ground; and C373-1, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to D9 . No REPAIR the affected circuit for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to D9.

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D9 CHECK CIRCUITS 444 (LG/BK), 446 (OG/WH) AND 447 (OG/RD) FOR AN OPEN
  • Measure the resistance between DSM C341a pins, harness side and driver seat rear height position sensor C373 pins, harness side.
    • DSM Connector — Pin Height Sensor Connector — Pin Circuit
    C341a-11 C373-2 444 (LG/BK)
    C341a-9 C373-3 446 (OG/WH)
    C341a-7 C373-1 447 (OG/RD)
    Yes GO to D10 . No REPAIR the affected circuit for an open. REPEAT the self-test
  • Are the resistances less than 5 ohms?
 Yes
GO to D10.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D10 CHECK CIRCUITS 444 (LG/BK), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO POWER
  • Key in ON position.
  • Measure the voltage between driver seat rear height position sensor C373-2, circuit 444 (LG/BK), harness side and ground; C373-3, circuit 446 (OG/WH), harness side and ground; and C373-1, circuit 447 (OG/RD), harness side and ground.
    • Yes REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEA
  • Is voltage present?
 Yes
REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to D23.
D11 CHECK THE HORIZONTAL POSITION SENSOR CIRCUITS 442 (LG/OG), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO GROUND
  • Disconnect: DSM C341a.
  • Disconnect: Horizontal Position Sensor C372.
  • Measure the resistance between driver seat horizontal position sensor C372-2, circuit 442 (LG/OG), harness side and ground; C372-3, circuit 446 (OG/WH), harness side and ground; and C372-1, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to D12 . No REPAIR the affected circuit for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to D12.

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D12 CHECK CIRCUITS 442 (LG/OG), 446 (OG/WH) AND 447 (OG/RD) FOR AN OPEN
  • Measure the resistance between DSM C341a pins, harness side and driver seat rear horizontal position sensor C372 pins, harness side.
    • DSM Connector — Pin Sensor Connector — Pin Circuit
    C341a-8 C372-2 442 (LG/OG)
    C341a-9 C372-3 446 (OG/WH)
    C341a-7 C372-1 447 (OG/RD)
    Yes GO to D13 . No REPAIR the affected circuit for an open. REPEAT the self-test
  • Are the resistances less than 5 ohms?
 Yes
GO to D13.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D13 CHECK CIRCUITS 442 (LG/OG), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO POWER
  • Key in ON position.
  • Measure the voltage between driver seat horizontal position sensor C372-2, circuit 442 (LG/OG), harness side and ground; C372-3, circuit 446 (OG/WH), harness side and ground; and C372-1, circuit 447 (OG/RD), harness side and ground.
    • Yes REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEA
  • Is voltage present?
 Yes
REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to D25.
D14 CHECK THE RECLINE POSITION SENSOR CIRCUITS 445 (OG/LB), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO GROUND
  • Disconnect: DSM C341a.
  • Disconnect: Recline Position Sensor C376.
  • Measure the resistance between driver seat recline position sensor C376-2, circuit 445 (OG/LB), harness side and ground C376-1, circuit 446 (OG/WH), harness side and ground; and C376-3, circuit 447 (OG/RD), harness side and ground.
    • Yes GO to D15 . No REPAIR the affected circuit for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to D15.

No
REPAIR the affected circuit for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D15 CHECK CIRCUITS 445 (OG/LB), 446 (OG/WH) AND 447 (OG/RD) FOR AN OPEN CIRCUIT
  • Measure the resistance between DSM C341a pins, harness side and driver seat recline position sensor C376 pins, harness side.
    • DSM Connector — Pin Recline Sensor Connector — Pin Circuit
    C341a-13 C376-2 445 (OG/LB)
    C341a-9 C376-1 446 (OG/WH)
    C341a-7 C376-3 447 (OG/RD)
    Yes GO to D16 . No REPAIR the affected circuit for an open. REPEAT the self-test
  • Are the resistances less than 5 ohms?
 Yes
GO to D16.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D16 CHECK CIRCUITS 445 (OG/LB), 446 (OG/WH) AND 447 (OG/RD) FOR A SHORT TO POWER
  • Key in ON position.
  • Measure the voltage between driver seat recline position sensor C376-2, circuit 445 (OG/LB), harness side and ground; C376-1, circuit 446 (OG/WH), harness side and ground; and C376-3, circuit 447 (OG/RD), harness side and ground.
    • Yes REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEA
  • Is there any voltage present?
 Yes
REPAIR the affected circuit for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to D27.
D17 CHECK CIRCUIT 446 (OG/WH) FOR AN OPEN
  • Disconnect: DSM C341a.
  • Disconnect: Driver Seat Front Height Position Sensor C383.
  • Disconnect: Driver Seat Rear Height Position Sensor C373.
  • Disconnect: Driver Seat Horizontal Height Position Sensor C372.
  • Disconnect: Driver Seat Front Recline Position Sensor C376.
  • Measure the resistance between DSM C341a-9, circuit 446 (OG/WH), harness side, and the following seat sensor connectors, harness side.
    • Sensor Connector — Pin
    Front Height C383-1
    Rear Height C373-3
    Horizontal C372-3
    Recline C376-1
    Yes GO to D18 . No REPAIR circuit 446 (OG/WH) for an open. REPEAT the self-test,
  • Are the resistances less than 5 ohms?
 Yes
GO to D18.

No
REPAIR circuit 446 (OG/WH) for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D18 CHECK CIRCUIT 447 (OG/RD) FOR AN OPEN
  • Measure the resistance between DSM C341a-7, circuit 447 (OG/RD), harness side, and the following seat sensor connectors, harness side.
    • Sensor Connector — Pin
    Front Height C383-3
    Rear Height C373-1
    Horizontal C372-1
    Recline C376-3
    Yes GO to D19 . No REPAIR circuit 447 (OG/RD) for an open. REPEAT the self-test,
  • Are the resistances less than 5 ohms?
 Yes
GO to D19.

No
REPAIR circuit 447 (OG/RD) for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D19 CHECK CIRCUIT 446 (OG/WH) FOR A SHORT TO GROUND
  • Disconnect: DSM C341a.
  • Measure the resistance between the following seat sensor connectors, circuit 446 (OG/WH), harness side and ground.
    • Sensor Connector — Pin
    Front Height C383-1
    Rear Height C373-3
    Horizontal C372-3
    Recline C376-1
    Yes GO to D20 . No REPAIR circuit 446 (OG/WH) for a short to ground. REPEAT the
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to D20.

No
REPAIR circuit 446 (OG/WH) for a short to ground. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D20 CHECK CIRCUIT 446 (OG/WH) FOR A SHORT TO POWER
  • Measure the voltage between the following seat sensor connectors, circuit 446 (OG/WH), harness side and ground.
    • Sensor Connector — Pin
    Front Height C383-1
    Rear Height C373-3
    Horizontal C372-3
    Recline C376-1
    Yes REPAIR circuit 446 (OG/WH) for a short to power. REPEAT the self-test, CLEAR
  • Is voltage present?
 Yes
REPAIR circuit 446 (OG/WH) for a short to power. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to D29.
D21 CHECK CIRCUITS 446 (OG/WH) AND 443 (LG/RD) FOR POWER
  • Key in OFF position.
  • Connect: DSM C341a.
  • Measure the voltage between driver seat front height position sensor C383-1, circuit 446 (OG/WH), harness side and ground, and at C383-2, circuit 443 (LG/RD), harness side and ground.
    • Yes GO to D22 . No INSTALL a new DSM. REFER to Section 419-10 for additional inf
  • Are the voltages between 4.0 and 5.0 volts?
 Yes
GO to D22.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D22 CHECK CIRCUIT 447 (OG/RD) FOR GROUND
  • Measure the resistance between driver seat front height position sensor C383-3, circuit 447 (OG/RD), harness side and ground.
    • Yes INSTALL a new driver seat front height position sensor. REFER to Memory Seat
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new driver seat front height position sensor. REFER to Memory Seat Position Sensor in this section. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D23 CHECK CIRCUITS 446 (OG/WH) AND 444 (LG/BK) FOR POWER
  • Key in OFF position.
  • Connect: DSM C341a.
  • Measure the voltage between the driver seat rear height position sensor C373-3, circuit 446 (OG/WH), harness side and ground, and at C373-2, circuit 444 (LG/BK), harness side and ground.
    • Yes GO to D24 . No INSTALL a new DSM. REFER to Section 419-10 for additional inf
  • Are the voltages between 4.0 and 5.0 volts?
 Yes
GO to D24.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D24 CHECK REAR HEIGHT POSITION SENSOR CIRCUIT 447 (OG/RD) FOR GROUND
  • Measure the resistance between driver seat rear height position sensor C373-1, circuit 447 (OG/RD), harness side and ground.
    • Yes INSTALL a new rear height position sensor. REFER to Memory Seat Position Sen
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new rear height position sensor. REFER to Memory Seat Position Sensor in this section. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new DSM. REFER to Section 419-10. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D25 CHECK CIRCUITS 446 (OG/WH) AND 442 (LG/OG) FOR POWER
  • Key in OFF position.
  • Connect: DSM C341a.
  • Measure the voltage between driver seat horizontal position sensor C372-3, circuit 446 (OG/WH), harness side and ground, and between C372-2, circuit 442 (LG/OG), harness side and ground.
    • Yes GO to D26 . No INSTALL a new DSM. REFER to Section 419-10 for additional inf
  • Are the voltages between 4.0 and 5.0 volts?
 Yes
GO to D26.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D26 CHECK HORIZONTAL POSITION SENSOR CIRCUIT 447 (OG/RD) FOR GROUND
  • Measure the resistance between driver seat horizontal position sensor C372-1, circuit 447 (OG/RD), harness side and ground.
    • Yes INSTALL a new horizontal position sensor. REFER to Memory Seat Position Sens
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new horizontal position sensor. REFER to Memory Seat Position Sensor in this section. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D27 CHECK CIRCUITS 446 (OG/WH) AND 445 (OG/LB) FOR POWER
  • Key in OFF position.
  • Connect: DSM C341a.
  • Measure the voltage between driver seat recline position sensor C376-1, circuit 446 (OG/WH), harness side and ground, and between C376-2, circuit 445 (OG/LB), harness side and ground.
    • Yes GO to D28 . No INSTALL a new DSM. REFER to Section 419-10 for additional inf
  • Are the voltages between 4.0 and 5.0 volts?
 Yes
GO to D28.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D28 CHECK RECLINE POSITION SENSOR CIRCUIT 447 (OG/RD) FOR GROUND
  • Measure the resistance between driver seat recline position sensor C376-3, circuit 447 (OG/RD), harness side and ground.
    • Yes INSTALL a new power seat recliner. REFER to Seat Recliner — Power in this se
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new power seat recliner. REFER to Seat Recliner — Power in this section. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
D29 CHECK FOR COMMON DTCS
  • Use recorded results from the DSM Self-Test.
  • Were DTCs B1667, B1668, B1669, B1670 and B1987 also retrieved?
 Yes
REFER to Section 501-09 to diagnose multiple DTCs B1667, B1668, B1669 and B1670 or Section 206-06 to diagnose DTC B1987. If still unable to diagnosis concern, INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test E: 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

The driver seat control switch is powered by battery voltage on circuit 490 (RD) and is supplied ground on circuit 57 (BK). When pressed, the seat control switch supplies that voltage and ground to the appropriate power seat track motor or recliner 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, which moves the seat or backrest in the opposite direction. There are 3 power seat track motors that combine to move the seat horizontally (FORWARD/REVERSE) and vertically (front UP/DOWN and rear UP/DOWN).

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 power recliner assembly.
  • a faulty seat track motor.

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

Test Step Result / Action to Take
E1 CHECK THE MOTOR 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Driver Seat Motor C353.
  • Measure the voltage between the affected motor electrical connector pins.

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

  • Actuate the driver seat control switch to the inoperative adjustment position. Actuate the switch in both directions of the adjustment.
  • Is voltage present in both directions?
 Yes
INSTALL a new front seat track motor and transmission assembly or the recliner assembly. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to E2.
E2 CHECK THE MOTOR CIRCUITS FOR A SHORT TO POWER
  • Disconnect: Driver Seat Control Switch C519.
  • Key in ON position.
  • Measure the voltage between driver seat control switch C519 harness side and ground, using the following chart for the inoperative motor function.
    • Connector — Pin Circuit Function
    C519-8 978 (YE/LB) Front DOWN
    C519-1 979 (RD/LB) Front UP
    C519-9 980 (YE/WH) REARWARD
    C519-10 981 (RD/WH) FORWARD
    C519-5 982 (YE/LG) Rear DOWN
    C519-4 983 (RD/LG) Rear UP
    C519-2 918 (GY) Recline REARWARD
    C519-3 919 (GY/BK) Recline FORWARD
    Yes REPAIR the affected circuit for a short to power. TEST the system for normal
  • Is voltage present on any circuit?
 Yes
REPAIR the affected circuit for a short to power. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to E3.
E3 CHECK FOR A SHORT TO GROUND
  • Measure the resistance between driver seat control switch C519 harness side and ground, using the following chart for the inoperative motor function.
    • Connector — Pin Circuit Function
    C519-8 978 (YE/LB) Front DOWN
    C519-1 979 (RD/LB) Front UP
    C519-9 980 (YE/WH) REARWARD
    C519-10 981 (RD/WH) FORWARD
    C519-5 982 (YE/LG) Rear DOWN
    C519-4 983 (RD/LG) Rear UP
    C519-2 918 (GY) Recline REARWARD
    C519-3 919 (GY/BK) Recline FORWARD
    Yes GO to E4 . No REPAIR the affected circuit for a short to ground. TEST the sy
  • Is resistance greater than 10,000 ohms?
 Yes
GO to E4.

No
REPAIR the affected circuit for a short to ground. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
E4 CHECK FOR AN OPEN CIRCUIT
  • Key in OFF position.
  • Measure the resistance of each affected circuit between the driver seat control switch C519 harness side and the affected motor connector harness side.
    • Connector — Pin Circuit Function
    C519-8 978 (YE/LB) Front DOWN
    C519-1 979 (RD/LB) Front UP
    C519-9 980 (YE/WH) REARWARD
    C519-10 981 (RD/WH) FORWARD
    C519-5 982 (YE/LG) Rear DOWN
    C519-4 983 (RD/LG) Rear UP
    C519-2 918 (GY) Recline REARWARD
    C519-3 919 (GY/BK) Recline FORWARD
    Yes INSTALL a new driver seat control switch. TEST the system for normal operati
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new driver seat control switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit for an open. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test F: 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 490 (RD) and is supplied ground on circuit 57 (BK). When pressed, the seat control switch supplies that voltage and ground to the appropriate passenger power seat track or recliner motor circuits 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 or recliner motor, which moves the seat or backrest in the opposite direction. There are 3 power seat track motors that combine to move the seat horizontally (FORWARD/REVERSE) and vertically (front UP/DOWN and rear UP/DOWN).

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 power recliner assembly.
  • a faulty seat track motor.

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

Test Step Result / Action to Take
F1 CHECK THE MOTOR 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Passenger Seat Side Air Bag C316.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Passenger Seat Side Air Bag C316.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Passenger Seat Motor C3015.
  • Measure the voltage between the affected motor electrical connector pins. Refer to Wiring Diagrams.

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

  • Actuate the passenger seat control switch to the inoperative adjustment position. Actuate the switch in both directions of the adjustment.
  • Is voltage present in both directions?
 Yes
INSTALL a new front seat track motor and transmission assembly or the recliner assembly. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
GO to F2.
F2 CHECK THE MOTOR CIRCUITS FOR A SHORT TO POWER
  • Key in ON position.
  • Measure the voltage between passenger seat control switch C627 harness side and ground, using the following chart for the inoperative motor function.
    • Connector — Pin Circuit Motor
    C627-3 919 (GY/BK) Recliner
    C627-2 918 (GY) Recliner
    C627-4 989 (RD/LG) Rear height
    C627-5 988 (YE/LG) Rear height
    C627-10 987 (RD/WH) Horizontal
    C627-9 986 (YE/WH) Horizontal
    C627-1 985 (RD/LB) Front height
    C627-8 984 (YE/LB) Front height
    Yes REPAIR the affected circuit for a short to power. TEST the system for normal
  • Is voltage present on any circuit?
 Yes
REPAIR the affected circuit for a short to power. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
GO to F3.
F3 CHECK FOR A SHORT TO GROUND
  • Disconnect: Passenger Seat Control Switch C627.
  • Measure the resistance between passenger seat control switch C627 harness side and ground, using the following chart for the inoperative motor function.
    • Connector — Pin Circuit Motor
    C627-8 984 (YE/LB) Front height
    C627-1 985 (RD/LB) Front height
    C627-9 986 (YE/WH) Horizontal
    C627-10 987 (RD/WH) Horizontal
    C627-5 988 (YE/LG) Rear height
    C627-4 989 (RD/LG) Rear height
    C627-2 918 (GY) Recliner
    C627-3 919 (GY/BK) Recliner
    Yes GO to F4 . No REPAIR the affected circuit for a short to ground. TEST the sy
  • Is the resistance greater than 10,000 ohms?
 Yes
GO to F4.

No
REPAIR the affected circuit for a short to ground. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
F4 CHECK FOR AN OPEN CIRCUIT
  • Key in OFF position.
  • Measure the resistance of each affected circuit between the passenger seat control switch C627 harness side and the affected motor connector harness side.
    • Connector — Pin Circuit Function
    C627-8 984 (YE/LB) Front height
    C627-1 985 (RD/LB) Front height
    C627-9 986 (YE/WH) Horizontal
    C627-10 987 (RD/WH) Horizontal
    C627-5 988 (YE/LG) Rear height
    C627-4 989 (RD/LG) Rear height
    C627-2 918 (GY) Recliner
    C627-3 919 (GY/BK) Recliner
    Yes INSTALL a new passenger seat control switch. TEST the system for normal oper
  • Are the resistances less than 5 ohms?
 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 C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit for an open. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test G: The Memory Seat Does Not Operate Correctly — Seat Recall Feature Is Inoperative, Does Not Operate Correctly/The Memory Seat Does Not Move Horizontally/Vertically/Recline

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

Refer to Wiring Diagrams Cell 57, Driver Door Module for schematic and connector information.

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

Normal Operation

A 3-lead sensor is attached to each motor on the memory seat track and recliner assembly. The sensor circuits are connected to the driver seat module (DSM) which supplies the sensor power and receives the sensor signals. The DSM receives data from the memory seat position sensors to monitor the positions of the seat track and recliner motors. This motor position data is stored when the DSM receives a SET switch input signal and recalled when it receives a RECALL switch input signal. The driver door module (DDM) is directly connected to the memory SET/RECALL switch and transmits the switch signal data to the DSM using the SCP communication bus. The DSM also receives memory recall signals from the remote transmitter over the SCP communication bus transmitted by the lighting control module (LCM).

Possible Causes

A memory seat that does not move horizontally, vertically or does not recline can be caused by:

  • wiring, terminals or connectors.
  • a faulty memory set switch.
  • a faulty power seat track motor position sensor.
  • a faulty DSM.

PINPOINT TEST G: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY — SEAT RECALL FEATURE IS INOPERATIVE, DOES NOT OPERATE CORRECTLY/THE MEMORY SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY/RECLINE

NOTE: Make sure the battery is in good condition and fully charged before carrying out diagnostics.

Test Step Result / Action to Take
G1 CHECK FOR DRIVER DOOR MODULE (DDM) 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Use the recorded results from the driver door module (DDM) self-test.
  • Are any DDM DTCs recorded?
 Yes
For DTC B1703, B1707, B1711, B1715, B1719, B1723, B1727 or B1731, Go To Pinpoint Test A.

For all others, REFER to the Diagnostic Trouble Code (DTC) Index in Section 419-10 to diagnose the DDM concern.

No
GO to G2.
G2 CHECK THE POWER SEAT OPERATION
  • NOTE: If the seat moves in one-second intervals, GO to Symptom Chart to repair the inoperative seat recall function.
  • Operate the driver seat using the seat control switch.
  • Does the seat move through all positions?
 Yes
GO to G3.

No
GO to Symptom Chart to diagnose the inoperative seat function.
G3 CHECK THE MEMORY RECALL OPERATION
  • Activate the memory recall for Driver 1 and Driver 2 from the memory set/recall switch.
  • Does the memory recall operate correctly?
 Yes
GO to G4.

No
GO to G5.
G4 CHECK THE MEMORY RECALL OPERATION FROM THE REMOTE KEYLESS ENTRY TRANSMITTER
  • Activate the memory recall for Driver 1 and Driver 2 from the remote keyless entry transmitter.
  • Does the memory recall operate correctly?
 Yes
The system is operating correctly at this time. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REFER to Section 501-14 to continue diagnosis for the remote keyless entry transmitter. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
G5 CHECK THE MEMORY SET SWITCH LED FOR A SHORT TO GROUND
  • Check the memory set switch LED.
  • Is the LED always ON?
 Yes
GO to G14.

No
GO to G6.
G6 CHECK THE DDM FOR CORRECT MEMORY SET SWITCH INPUT
  • Enter the following diagnostic mode on the diagnostic tool: Monitor PID.
  • Monitor the DDM memory SET switch PID while pressing and releasing the memory set switch button.
  • Does the DDM PID value agree with the switch positions?
 Yes
GO to G7.

No
GO to G10.
G7 CHECK THE MEMORY SET SWITCH OPERATION
  • Press and release the memory set switch.
  • Does the memory set switch LED remain ON for 5 seconds?
 Yes
GO to G8.

No
GO to G13.
G8 CHECK THE DDM FOR CORRECT MEMORY/RECALL SWITCH NO. 1 INPUT
  • Enter the following diagnostic mode on the diagnostic tool: Monitor PID.
  • Monitor the DDM memory SET/RECALL 1 switch PID while pressing and releasing the memory SET/RECALL 1 switch.
  • Does the DDM PID value agree with the switch positions?
 Yes
GO to G9.

No
GO to G10.
G9 CHECK THE DDM FOR CORRECT MEMORY/RECALL SWITCH NO. 2
  • Enter the following diagnostic mode on the diagnostic tool: Monitor PID.
  • Monitor the DDM memory SET/RECALL 2 switch PID while pressing and releasing the memory SET/RECALL 2 switch.
  • Does the DDM PID agree with the switch positions?
 Yes
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to G10.
G10 CHECK CIRCUITS 270 (BN/OG), 267 (BN/LG) AND 268 (BK/OG) FOR A SHORT TO GROUND
  • Disconnect: DDM C501a.
  • Measure the resistance between the following DDM C501a pins, harness side and ground.
    • Connector — Pin Circuit
    C501a-4 270 (BN/OG)
    C501a-5 267 (BN/LG)
    C501a-6 268 (BK/OG)
    Yes GO to G12 . No GO to G11 .
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to G12.

No
GO to G11.
G11 CHECK MEMORY SET NO. 1 AND NO. 2 FOR A SHORT TO GROUND
  • Disconnect: Driver Seat Switch C545.
  • Measure the resistance between the following DDM C501a pins, harness side and ground.
    • Connector — Pin Circuit
    C501a-4 270 (BN/OG)
    C501a-5 267 (BN/LG)
    C501a-6 268 (BN/OG)
    Yes INSTALL a new driver seat control switch. REPEAT the self-test, CLEAR the DT
  • Are the resistances greater than 10,000 ohms?
 Yes
INSTALL a new driver seat control switch. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the affected circuit for a short to ground. CARRY OUT the driver seat control switch component test to verify the switch has not been damaged.

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

REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
G12 CHECK CIRCUITS 270 (BN/OG), 267 (BN/LG) AND 268 (BK/OG) FOR AN OPEN
  • Disconnect: Driver Seat Switch C545.
  • Measure the resistance between DDM C501a-4, circuit 270 (BN/OG), harness side and driver seat control switch C545-9, circuit 270 (BN/OG), harness side.
    • Yes GO to G15 . No REPAIR the affected circuit for an open. REPEAT the self-test
  • Measure the resistance between DDM C501a-5, circuit 267 (BN/LG), harness side and driver seat control switch C545-11, circuit 267 (BN/LG), harness side.
    • Yes GO to G15 . No REPAIR the affected circuit for an open. REPEAT the self-test
  • Measure the resistance between DDM C501a-6, circuit 268 (BK/OG), harness side and driver seat control switch C545-13, circuit 268 (BK/OG), harness side.
    • Yes GO to G15 . No REPAIR the affected circuit for an open. REPEAT the self-test
  • Are the resistances less than 5 ohms?
 Yes
GO to G15.

No
REPAIR the affected circuit for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
G13 CHECK CIRCUIT 272 (WH/OG) FOR AN OPEN
  • Disconnect: DDM C501a.
  • Disconnect: Driver Seat Switch C545.
  • Measure the resistance between DDM C501a-25, circuit 272 (WH/OG), harness side and the driver seat control switch C545-7, circuit 272 (WH/OG), harness side.
    • Yes GO to G15 . No REPAIR circuit 272 (WH/OG) for an open. REPEAT the self-test,
  • Is the resistance less than 5 ohms?
 Yes
GO to G15.

No
REPAIR circuit 272 (WH/OG) for an open. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
G14 CHECK CIRCUIT 272 (WH/OG) FOR A SHORT TO GROUND
  • Disconnect: DDM C501a.
  • Disconnect: Driver Seat Switch C545.
  • Measure the resistance between DDM C501a-25, circuit 272 (WH/OG), harness side and ground.
    • Yes INSTALL a new driver seat control switch. REPEAT the self-test, CLEAR the DT
  • Is the resistance greater than 10,000 ohms?
 Yes
INSTALL a new driver seat control switch. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR circuit 272 (WH/OG) for a short to ground. CARRY OUT the driver seat control switch component test to verify the switch has not been damaged.

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

REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
G15 CHECK MEMORY SET/RECALL SWITCH
  • Carry out the driver seat control switch component test.

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

  • Did the switch pass?
 Yes
INSTALL a new DDM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new driver seat control switch. REPEAT the self-test, CLEAR the DTCs. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test H: Easy Exit/Easy Entry Does Not Operate Correctly

NOTE: The driver power seat easy entry/easy exit feature can be enabled/disabled. Check that the feature is enabled before continuing diagnostics. Refer to Section 418-01 or the owner's literature.

Normal Operation

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 SCP 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.

Possible Causes

A memory seat with an inoperative easy exit/easy entry feature can be caused by:

  • wiring, terminals or connectors (SCP communication concern).
  • a faulty key-in ignition switch.
  • a faulty memory power seat track.
  • a faulty DSM.
  • a faulty lighting control module (LCM).

PINPOINT TEST H: EASY EXIT/EASY ENTRY DOES NOT OPERATE CORRECTLY

Test Step Result / Action to Take
H1 CHECK THE DRIVER SEAT OPERATION
  • Key in OFF position.
  • NOTE: The driver seat may move in one-second intervals.
  • Operate the driver seat in all directions using the driver seat control switch.
  • Does the driver seat operate in all directions?
 Yes
GO to H2.

No
GO to Symptom Chart to diagnose the inoperative seat function.
H2 CHECK THE EASY EXIT OPERATION
  • Key in ON position.
  • Position the driver seat at least 2 inches from the rear stop point.
  • Remove the key from the ignition.
  • Does the driver seat move REARWARD approximately 2 inches?
 Yes
GO to H5.

No
GO to H3.
H3 CHECK THE LIGHTING CONTROL MODULE (LCM) FOR CORRECT INPUTS
  • Enter the following diagnostic mode on the diagnostic tool: Monitor PIDs.
  • Starting in the OFF position, cycle the ignition switch one position at a time while monitoring the lighting control module (LCM) ignition switch input status PIDs.
  • Remove the key while monitoring the LCM ignition switch input status PIDs.
  • Do the DDM ignition switch PIDs agree with the switch positions and indicate key IN and OUT correctly?
 Yes
GO to H4.

No
REFER to Section 211-05 to diagnose the ignition switch concern.
H4 CHECK FOR DTCS FROM THE DRIVER SEAT MODULE (DSM)
  • Use the recorded results from the driver seat module (DSM) self-test.
  • Were any DSM DTCs retrieved?
 Yes
If DTC B1665, B1962 or B1965 are retrieved, Go To Pinpoint Test D.

REFER to the Diagnostic Trouble Code (DTC) Index in this section for additional DSM DTC diagnosis or Section 419-10 to diagnose all other DSM DTC concerns.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs.
H5 CHECK THE EASY ENTRY OPERATION
  • Remove the key from the ignition switch, exit the vehicle and close the door.
  • After 10 seconds, open the driver door, sit in the driver seat and close the door.
  • Does the driver seat move FORWARD approximately 2 inches?
 Yes
The system is operating correctly at this time. INSTRUCT the customer on the correct operation of the system.

No
GO to H6.
H6 CHECK FOR DTCS FROM THE LCM
  • Enter the following diagnostic mode on the diagnostic tool: Retrieve Continuous DTCs.
  • NOTE: If unable to communicate with the lighting control module (LCM), refer to Section 419-10 to diagnose no communication with the LCM.
  • Retrieve and record the continuous DTCs from the lighting control module (LCM).
  • Clear the continuous LCM DTCs.
  • Carry out the LCM Self-Test and retrieve the On-Demand DTCs.
  • Are any LCM DTCs recorded?
 Yes
REFER to the Diagnostic Trouble Code (DTC) Index in Section 419-10 to diagnose the LCM concern.

No
GO to H7.
H7 CHECK DSM DTCs
  • Use the recorded results from the DSM Self-Test.
  • Were any DTCs retrieved?
 Yes
REFER to the Diagnostic Trouble Code (DTC) Index to diagnose the DTCs.

No
INSTALL a new DSM. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs.

Pinpoint Test I: The Heated Seat Is Inoperative — Driver

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

Normal Operation

The driver heated seat module receives battery voltage feed on circuit 1048 (LB/WH) and ignition voltage feed on circuit 1040 (RD/BK), and is supplied ground on circuit 676 (PK/OG). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1020 (DG/VT) to command the system ON or OFF in HI heat mode or circuit 1255 (WH/RD) to command the system ON or OFF in LOW heat mode. When commanded ON, a ground signal is supplied to the heated seat switch from the heated seat module on either circuit 1019 (TN/LB) (HI heat mode) or circuit 1018 (LG/OG) (LOW heat mode) illuminating the switch indicator. The heated seat module also supplies voltage to the cushion and backrest heater mats on circuit 1064 (YE/LB) and ground to the heater mats on circuit 1065 (WH/LB). 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 1060 (BK/LB) and monitors the return signal from the temperature sensor on circuit 1061 (BN/LB) for adjusting the 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 the 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 heated seat switch.
  • a faulty heater mat.
  • a faulty heated seat module.

PINPOINT TEST I: THE HEATED SEAT IS INOPERATIVE — DRIVER

Test Step Result / Action to Take
I1 CHECK THE HEATED SEAT SWITCH INPUT 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag Module C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Heated Seat Module C681.
  • Measure the resistance between heated seat module C681-11, circuit 1020 (DG/VT), harness side and ground and between C681-12, circuit 1255 (WH/RD), harness side and ground while pressing the heated seat switch.
    • Yes GO to I3 . No GO to I2 .
  • Are the resistances less than 50 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed?
 Yes
GO to I3.

No
GO to I2.
I2 CHECK HEATED SEAT SWITCH GROUND CIRCUIT 57 (BK)
  • Disconnect: Driver Heated Seat Switch C538.
  • Measure the resistance between driver heated seat switch C538-1, circuit 57 (BK), harness side and ground.
    • Yes INSTALL a new heated seat switch. TEST the system for normal operation. DISC
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new heated seat switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR circuit 57 (BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
I3 CHECK CIRCUIT 1048 (LB/WH) FOR VOLTAGE TO THE HEATED SEAT MODULE
  • Measure the voltage between heated seat module C681-1, circuit 1048 (LB/WH) harness side and ground and C681-17, circuit 1048 (LB/WH) harness side and ground.
    • Yes GO to I4 . No VERIFY BJB fuse 16 (20A) is OK. If OK, REPAIR circuit 1048 (LB
  • Is the voltages greater than 10 volts?
 Yes
GO to I4.

No
VERIFY BJB fuse 16 (20A) is OK. If OK, REPAIR circuit 1048 (LB/WH). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
I4 CHECK CIRCUIT 1040 (RD/BK) FOR VOLTAGE TO THE HEATED SEAT MODULE
  • Key in ON position.
  • Measure the voltage between heated seat module C681-2, circuit 1040 (RD/BK), harness side and ground.
    • Yes GO to I5 . No VERIFY CJB fuse 17 (10A) is OK. If OK, REPAIR circuit 1040 (RD
  • Is the voltage greater than 10 volts?
 Yes
GO to I5.

No
VERIFY CJB fuse 17 (10A) is OK. If OK, REPAIR circuit 1040 (RD/BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
I5 CHECK HEATED SEAT MODULE GROUND CIRCUIT 676 (PK/OG)
  • Key in OFF position.
  • Measure the resistance between heated seat module C681-7, circuit 676 (PK/OG), harness side and ground.
    • Yes GO to I6 . No REPAIR circuit 676 (PK/OG). TEST the system for normal operati
  • Is the resistance less than 5 ohms?
 Yes
GO to I6.

No
REPAIR circuit 676 (PK/OG). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
I6 CHECK CIRCUIT 1064 (YE/LB) FOR SHORT TO VOLTAGE
  • Disconnect: Driver Seat Cushion Heater C364.
  • Key in ON position.
  • Measure the voltage between driver seat cushion heater C364-1, circuit 1064 (YE/LB), harness side and ground.
    • Yes REPAIR circuit 1064 (YE/LB). TEST the system for normal operation. DISCONNEC
  • Is voltage present on the circuit?
 Yes
REPAIR circuit 1064 (YE/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to I7.
I7 CHECK CIRCUIT 1064 (YE/LB) FOR AN OPEN OR SHORT TO GROUND
  • Key in OFF position.
  • Measure the resistance between driver seat cushion heater C364-1, circuit 1064 (YE/LB), harness side and ground; and between C364-1, circuit 1064 (YE/LB), harness side and C681-9, circuit 1064 (YE/LB) harness side.
    • Yes GO to I8 . No REPAIR circuit 1064 (YE/LB). TEST the system for normal operat
  • Is the resistance greater than 10,000 ohms between C364-1 and ground and less than 5 ohms between C364-1 and C681-9?
 Yes
GO to I8.

No
REPAIR circuit 1064 (YE/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
I8 CHECK CIRCUIT 57 (BK) FOR AN OPEN
  • Measure the resistance between driver seat cushion heater C364-4, circuit 57 (BK), harness side and ground.
    • Yes GO to I9 . No REPAIR circuit 57 (BK). TEST the system for normal operation.
  • Is the resistance less than 5 ohms?
 Yes
GO to I9.

No
REPAIR circuit 57 (BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
I9 CHECK HEATED SEAT ELEMENTS FOR SHORT TO GROUND OR AN OPEN
  • Measure the resistance between C364-1, circuit 1064 (YE/LB), component side and C364-4, circuit 57 (BK), component side; and between C364-1, circuit 1064 (YE/LB), component side and ground.
    • Yes GO to I11 . No GO to I10 .
  • Is the resistance greater than 1.6 ohms and less than 10 ohms between C364-1 component side and C364-4 component side; and greater than 10,000 ohms between C364-1 and ground?
 Yes
GO to I11.

No
GO to I10.
I10 CHECK THE SEAT BACK HEATER
  • Disconnect: Driver Seat Back Heater Connector.
  • Measure the resistance between driver seat back heater pin 1 and pin 2, seat back heater component side.
    • Yes INSTALL a new driver seat cushion heater. TEST the system for normal operati
  • Is the resistance between 0.6 and 0.9 ohm?
 Yes
INSTALL a new driver seat cushion heater. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new driver seat back heater. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
I11 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR A SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between heated seat module C681-13, circuit 1061 (BN/LB), harness side and ground and between C681-10, circuit 1060 (BK/LB), harness side and ground.
    • Yes REPAIR the affected circuit. TEST the system for normal operation. DISCONNEC
  • Is voltage present on either circuit?
 Yes
REPAIR the affected circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to I12.
I12 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS
  • Key in OFF position.
  • Measure the resistance between heated seat module C681-13, circuit 1061 (BN/LB), harness side and C681-10, circuit 1060 (BK/LB), harness side; and between heated seat module C681-13, circuit 1061 (BN/LB), harness side and ground.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. DISC
  • Is the resistance less than 300,000 ohms and greater than 50 ohms between C681 pin 13 and C681 pin 10 and greater than 10,000 ohms between C681 pin 13 and ground?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to I13.
I13 CHECK CIRCUIT 1061 (BN/LB) FOR AN OPEN OR SHORT TO GROUND
  • Measure the resistance between heated seat module C681-13, circuit 1061 (BN/LB), harness side and the driver seat cushion heater C364-2, circuit 1061 (BN/LB), harness side; and between heated seat module C681-13, circuit 1061 (BN/LB), harness side and ground.
    • Yes GO to I14 . No REPAIR circuit 1061 (BN/LB). TEST the system for normal opera
  • Is the resistance less than 5 ohms between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
GO to I14.

No
REPAIR circuit 1061 (BN/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
I14 CHECK CIRCUIT 1060 (BK/LB) FOR AN OPEN OR SHORT TO GROUND
  • Measure the resistance between heated seat module C681-10, circuit 1060 (BK/LB), harness side and driver seat cushion heater C364-3, circuit 1060 (BK/LB), harness side; and between heated seat module C681-10, circuit 1060 (BK/LB), harness side and ground.
    • Yes INSTALL a new driver seat cushion heater. TEST the system for normal operati
  • Is the resistance less than 5 ohms between the heated seat module and the 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. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR circuit 1060 (BK/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test J: The Heated Seat Is Inoperative — Passenger

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

Normal Operation

The passenger heated seat module receives battery voltage feed on circuit 1048 (LB/WH) and ignition voltage feed on circuit 1040 (RD/BK), and is supplied ground on circuit 676 (PK/OG). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 581 (RD) to command the system ON or OFF in HI heat mode or circuit 1256 (WH/YE) to command the system ON or OFF in LOW heat mode. When commanded ON, a ground signal is supplied to the heated seat switch from the heated seat module on either circuit 580 (BN) (HI heat mode) or circuit 579 (BK/OG) (LOW heat mode) illuminating the switch indicator. The heated seat module also supplies voltage to the cushion and backrest heater mats on circuit 1064 (YE/LB) and ground to the heater mats on circuit 1065 (WH/LB). 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 1060 (BK/LB) and monitors the return signal from the temperature sensor on circuit 1061 (BN/LB) for adjusting the 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 the 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 heated seat switch.
  • a faulty heater mat.
  • a faulty heated seat module.

PINPOINT TEST J: THE HEATED SEAT IS INOPERATIVE — PASSENGER

Test Step Result / Action to Take
J1 CHECK THE HEATED SEAT SWITCH INPUT 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Passenger Seat Side Air Bag C316.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Passenger Seat Side Air Bag C316.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Heated Seat Module C681.
  • Measure the resistance between heated seat module C681-14, circuit 581 (RD), harness side and ground and between C681-15, circuit 1256 (WH/YE), harness side and ground while pressing the heated seat switch.
    • Yes GO to J3 . No GO to J2 .
  • Are the resistances less than 5 ohms when the heated seat switch is pressed?
 Yes
GO to J3.

No
GO to J2.
J2 CHECK HEATED SEAT SWITCH GROUND CIRCUIT 57 (BK)
  • Disconnect: Passenger Heated Seat Switch C630.
  • Measure the resistance between passenger heated seat switch C630-1, circuit 57 (BK), harness side and ground.
    • Yes INSTALL a new heated seat switch. TEST the system for normal operation. DISC
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new heated seat switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR circuit 57 (BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
J3 CHECK CIRCUIT 1048 (LB/WH) FOR VOLTAGE TO THE HEATED SEAT MODULE
  • Measure the voltage between heated seat module C681-1, circuit 1048 (LB/WH) harness side and ground and C681-17, circuit 1048 (LB/WH) harness side and ground.
    • Yes GO to J4 . No VERIFY BJB fuse 16 (20A) is OK. If OK, REPAIR circuit 1048 (LB
  • Are the voltages greater than 10 volts?
 Yes
GO to J4.

No
VERIFY BJB fuse 16 (20A) is OK. If OK, REPAIR circuit 1048 (LB/WH). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
J4 CHECK CIRCUIT 1040 (RD/BK) FOR VOLTAGE TO THE HEATED SEAT MODULE
  • Key in ON position.
  • Measure the voltage between heated seat module C681-2, circuit 1040 (RD/BK), harness side and ground.
    • Yes GO to J5 . No VERIFY CJB fuse 17 (10A) is OK. If OK, REPAIR circuit 1040 (RD
  • Is the voltage greater than 10 volts?
 Yes
GO to J5.

No
VERIFY CJB fuse 17 (10A) is OK. If OK, REPAIR circuit 1040 (RD/BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
J5 CHECK HEATED SEAT MODULE GROUND CIRCUIT 676 (PK/OG)
  • Key in OFF position.
  • Measure the resistance between heated seat module C681-7, circuit 676 (PK/OG), harness side and ground.
    • Yes GO to J6 . No REPAIR circuit 676 (PK/OG). TEST the system for normal operati
  • Is the resistance less than 5 ohms?
 Yes
GO to J6.

No
REPAIR circuit 676 (PK/OG). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
J6 CHECK CIRCUIT 1064 (YE/LB) FOR SHORT TO VOLTAGE
  • Disconnect: Passenger Seat Cushion Heater C334.
  • Key in ON position.
  • Measure the voltage between the passenger seat cushion heater C334-1, circuit 1064 (YE/LB), harness side and ground.
    • Yes REPAIR circuit 1064 (YE/LB). TEST the system for normal operation. DISCONNEC
  • Is voltage present on the circuit?
 Yes
REPAIR circuit 1064 (YE/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
GO to J7.
J7 CHECK CIRCUIT 1064 (YE/LB) FOR AN OPEN OR SHORT TO GROUND
  • Key in OFF position.
  • Measure the resistance between driver seat cushion heater C334-1, circuit 1064 (YE/LB), harness side and ground; and between C334-1, circuit 1064 (YE/LB) harness side and C681-8, circuit 1064 (YE/LB), harness side.
    • Yes GO to J8 . No REPAIR circuit 1064 (YE/LB). TEST the system for normal operat
  • Is the resistance greater than 10,000 ohms between C334-1 and ground and less than 5 ohms between C334-1 and C681-8?
 Yes
GO to J8.

No
REPAIR circuit 1064 (YE/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
J8 CHECK CIRCUIT 57 (BK) FOR AN OPEN
  • Measure the resistance between passenger seat cushion heater C334-4, circuit 57 (BK), harness side and ground.
    • Yes GO to J9 . No REPAIR circuit 57 (BK). TEST the system for normal operation.
  • Is the resistance less than 5 ohms?
 Yes
GO to J9.

No
REPAIR circuit 57 (BK). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
J9 CHECK HEATER MATS FOR SHORT TO GROUND OR AN OPEN
  • Measure the resistance between C334-4, circuit 1064 (YE/LB), component side and C334-1, circuit 57 (BK), component side; and between C334-4, circuit 1064 (YE/LB), component side and ground.
    • Yes GO to J11 . No GO to J10 .
  • Is the resistance greater than 1.6 ohms and less than 10 ohms between C334-4 component side and C334-1 component side; and greater than 10,000 ohms between C334-4 and ground?
 Yes
GO to J11.

No
GO to J10.
J10 CHECK THE SEAT BACK HEATER
  • Disconnect: Passenger Seat Back Heater Connector.
  • Measure the resistance between passenger seat back heater pin 1 and pin 2, seat back heater component side.
    • Yes INSTALL a new passenger seat cushion heater. TEST the system for normal oper
  • Is the resistance between 0.6 and 0.9 ohm?
 Yes
INSTALL a new passenger seat cushion heater. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new passenger seat back heater. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
J11 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS FOR A SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between heated seat module C681-13, circuit 1061 (BN/LB), harness side and ground and between C681-16, circuit 1060 (BK/LB), harness side and ground.
    • Yes REPAIR the affected circuit. TEST the system for normal operation. DISCONNEC
  • Is voltage present on either circuit?
 Yes
REPAIR the affected circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
GO to J12.
J12 CHECK THE HEATED SEAT TEMPERATURE SENSOR AND CIRCUITS
  • Key in OFF position.
  • Measure the resistance between heated seat module C681-13, circuit 1061 (BN/LB), harness side and C681-16, circuit 1060 (BK/LB), harness side; and between heated seat module C681-13, circuit 1061 (BN/LB), harness side and ground.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. DISC
  • Is the resistance less than 300,000 ohms and greater than 50 ohms between C681-13 and C681-16 and greater than 10,000 ohms between C681-13 and ground?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
GO to J13.
J13 CHECK CIRCUIT 1061 (BN/LB) FOR AN OPEN OR SHORT TO GROUND
  • Measure the resistance between heated seat module C681-13, circuit 1061 (BN/LB), harness side and passenger seat cushion heater C334-3, circuit 1061 (BN/LB), harness side; and between heated seat module C681-13, circuit 1061 (BN/LB), harness side and ground.
    • Yes GO to J14 . No REPAIR circuit 1061 (BN/LB). TEST the system for normal opera
  • Is the resistance less than 5 ohms between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
GO to J14.

No
REPAIR circuit 1061 (BN/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
J14 CHECK CIRCUIT 1060 (BK/LB) FOR AN OPEN OR SHORT TO GROUND
  • Measure the resistance between heated seat module C681-16, circuit 1060 (BK/LB), harness side and passenger seat cushion heater C334-2, circuit 1060 (BK/LB), harness side; and between heated seat module C681-16, circuit 1060 (BK/LB), harness side and ground.
    • Yes INSTALL a new passenger seat cushion heater. TEST the system for normal oper
  • Is the resistance less than 5 ohms between the heated seat module and the 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. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR circuit 1060 (BK/LB). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test K: The Heated Seat Is Inoperative — Driver, Does Not Operate In High

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

Normal Operation

The driver heated seat module receives battery voltage feed on circuit 1048 (LB/WH), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 676 (PK/OG). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1020 (DG/VT) to command the system ON or OFF in HI heat mode.

Possible Causes

A driver heated seat that does not operate in HI can be caused by:

  • faulty wiring, terminals or connectors.
  • a faulty heated seat switch.
  • a faulty heated seat module.

PINPOINT TEST K: THE HEATED SEAT IS INOPERATIVE — DRIVER, DOES NOT OPERATE IN HIGH

Test Step Result / Action to Take
K1 CHECK THE HEATED SEAT SWITCH INPUT 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Heated Seat Module C681.
  • Measure the resistance between heated seat module C681-11, circuit 1020 (DG/VT), harness side and ground while pressing the heated seat switch.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. DISC
  • Is the resistance less than 50 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to K2.
K2 CHECK CIRCUIT 1020 (DG/VT) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Driver Heated Seat Switch C538.
  • Measure the resistance between driver heated seat switch C538-6, circuit 1020 (DG/VT), harness side and heated seat module C681-11, circuit 1020 (DG/VT), harness side; and between driver heated seat switch C538-6, circuit 1020 (DG/VT), harness side and ground.
    • Yes GO to K3 . No REPAIR circuit 1020 (DG/VT). TEST the system for normal operat
  • Is the resistance less than 1 ohm between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
 Yes
GO to K3.

No
REPAIR circuit 1020 (DG/VT). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
K3 CHECK CIRCUIT 1020 (DG/VT) FOR SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between heated seat module C681-11, circuit 1020 (DG/VT), harness side and ground.
    • Yes REPAIR circuit 1020 (DG/VT). TEST the system for normal operation. DISCONNEC
  • Is voltage present?
 Yes
REPAIR circuit 1020 (DG/VT). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new heated seat switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test L: The Heated Seat Is Inoperative — Driver, Does Not Operate In Low

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

Normal Operation

The driver heated seat module receives battery voltage feed on circuit 1048 (LB/WH), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 676 (PK/OG). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1255 (WH/RD) to command the system ON or OFF in LOW heat mode.

Possible Causes

A driver heated seat that does not operate in LOW can be caused by:

  • faulty wiring, terminals or connectors.
  • a faulty heated seat switch.
  • a faulty heated seat module.

PINPOINT TEST L: THE HEATED SEAT IS INOPERATIVE — DRIVER, DOES NOT OPERATE IN LOW

Test Step Result / Action to Take
L1 CHECK THE HEATED SEAT SWITCH INPUT 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Heated Seat Module C681.
  • Measure the resistance between heated seat module C681-12, circuit 1255 (WH/RD), harness side and ground while pressing the heated seat switch.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. DISC
  • Is the resistance less than 50 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to L2.
L2 CHECK CIRCUIT 1255 (WH/RD) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Driver Heated Seat Switch C538.
  • Measure the resistance between driver heated seat switch C538-2, circuit 1255 (WH/RD), harness side and heated seat module C681-12, circuit 1255 (WH/RD), harness side; and between driver heated seat switch C538-2, circuit 1255 (WH/RD), harness side and ground.
    • Yes GO to L3 . No REPAIR circuit 1255 (WH/RD). TEST the system for normal operat
  • Is the resistance less than 1 ohm between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
 Yes
GO to L3.

No
REPAIR circuit 1255 (WH/RD). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
L3 CHECK CIRCUIT 1255 (WH/RD) FOR SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between heated seat module C681-12, circuit 1255 (WH/RD), harness side and ground.
    • Yes REPAIR circuit 1255 (WH/RD). TEST the system for normal operation. DISCONNEC
  • Is voltage present?
 Yes
REPAIR circuit 1255 (WH/RD). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new heated seat switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test M: The Heated Seat Is Inoperative — Passenger, Does Not Operate In High

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

Normal Operation

The driver heated seat module receives battery voltage feed on circuit 1048 (LB/WH), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 676 (PK/OG). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 581 (RD) to command the system ON or OFF in HI heat mode.

Possible Causes

A passenger heated seat that does not operate in HI can be caused by:

  • faulty wiring, terminals or connectors.
  • a faulty heated seat switch.
  • a faulty heated seat module.

PINPOINT TEST M: THE HEATED SEAT IS INOPERATIVE — PASSENGER, DOES NOT OPERATE IN HIGH

Test Step Result / Action to Take
M1 CHECK THE HEATED SEAT SWITCH INPUT 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Passenger Seat Side Air Bag C316.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Passenger Seat Side Air Bag C316.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Heated Seat Module C681.
  • Measure the resistance between heated seat module C681-14, circuit 581 (RD), harness side and ground while pressing the heated seat switch.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. DISC
  • Is the resistance less than 50 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
GO to M2.
M2 CHECK CIRCUIT 581 (RD), 1020 (DG/VT) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Passenger Heated Seat Switch C630.
  • Measure the resistance between passenger heated seat switch C630-6, circuit 1020 (DG/VT), harness side and heated seat module C681-14, circuit 581 (RD), harness side; and between passenger heated seat switch C630-6, circuit 1020 (DG/VT), harness side and ground.
    • Yes GO to M3 . No REPAIR circuit 581 (RD) or 1020 (DG/VT). TEST the system for n
  • Is the resistance less than 1 ohm between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
 Yes
GO to M3.

No
REPAIR circuit 581 (RD) or 1020 (DG/VT). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
M3 CHECK CIRCUIT 581 (RD) FOR SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between heated seat module C681-14, circuit 581 (RD), harness side and ground.
    • Yes REPAIR circuit 581 (RD). TEST the system for normal operation. DISCONNECT th
  • Is voltage present?
 Yes
REPAIR circuit 581 (RD). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new heated seat switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test N: The Heated Seat Is Inoperative — Passenger, Does Not Operate In Low

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

Normal Operation

The driver heated seat module receives battery voltage feed on circuit 1048 (LB/WH), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 676 (PK/OG). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1256 (WH/YE) to command the system ON or OFF in LOW heat mode.

Possible Causes

A passenger heated seat that does not operate in LOW can be caused by:

  • faulty wiring, terminals or connectors.
  • a faulty heated seat switch.
  • a faulty heated seat module.

PINPOINT TEST N: THE HEATED SEAT IS INOPERATIVE — PASSENGER, DOES NOT OPERATE IN LOW

Test Step Result / Action to Take
N1 CHECK THE HEATED SEAT SWITCH INPUT 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Passenger Seat Side Air Bag C316.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Passenger Seat Side Air Bag C316.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Heated Seat Module C681.
  • Measure the resistance between heated seat module C681-15, circuit 1256 (WH/YE), harness side and ground while pressing the heated seat switch.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. DISC
  • Is the resistance less than 50 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
GO to N2.
N2 CHECK CIRCUIT 1256 (WH/YE), 1255 (WH/RD) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Passenger Heated Seat Switch C630.
  • Measure the resistance between passenger heated seat switch C630-2, circuit 1255 (WH/RD), harness side and heated seat module C681-15, circuit 1256 (WH/YE), harness side; and between passenger heated seat switch C630-2, circuit 1255 (WH/RD), harness side and ground.
    • Yes GO to N3 . No REPAIR the circuit. TEST the system for normal operation. DISC
  • Is the resistance less than 1 ohm between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
 Yes
GO to N3.

No
REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
N3 CHECK CIRCUIT 1256 (WH/YE) FOR SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between heated seat module C681-15, circuit 1256 (WH/YE), harness side and ground.
    • Yes REPAIR circuit 1256 (WH/YE). TEST the system for normal operation. DISCONNEC
  • Is voltage present?
 Yes
REPAIR circuit 1256 (WH/YE). TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
INSTALL a new heated seat switch. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test O: The Heated Seat Is Inoperative — Left Rear

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

Normal Operation

The left rear heated seat module receives battery voltage feed on circuit 1445 (RD/LG), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 57 (BK). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1020 (DG/VT) to command the system ON or OFF in HI heat mode or circuit 1255 (WH/RD) to command the system ON or OFF in LOW heat mode. When commanded ON, a ground signal is supplied to the heated seat switch from the heated seat module on either circuit 1019 (TN/LB) (HI heat mode) or circuit 1018 (LG/OG) illuminating the switch indicator. The heated seat module also supplies voltage to the cushion and backrest heater mats on circuit 1064 (YE/LB) and ground to the heater mats on circuit 1065 (WH/LB). 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 1060 (BK/LB) and monitors the return signal from the temperature sensor on circuit 1061 (BN/LB) for adjusting the 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 the time-out period occurs.

Possible Causes

An inoperative left rear heated seat can be caused by:

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

PINPOINT TEST O: THE HEATED SEAT IS INOPERATIVE — LEFT REAR

Test Step Result / Action to Take
O1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE
  • Key in OFF position.
  • Disconnect: Left Rear Heated Seat Module C3162.
  • Measure the resistance between left rear heated seat module C3162-8, circuit 1020 (DG/VT), and C3162-11, circuit 1255 (WH/RD), harness side and ground while pressing the heated seat switch.
    • Yes GO to O3 . No GO to O2 .
  • Are the resistances less than 50 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed?
 Yes
GO to O3.

No
GO to O2.
O2 CHECK HEATED SEAT SWITCH GROUND CIRCUIT 57 (BK)
  • Disconnect: Left Rear Heated Seat Switch C722.
  • Measure the resistance between left rear heated seat switch C722-1, circuit 57 (BK), harness side and ground.
    • Yes INSTALL a new heated seat switch. TEST the system for normal operation. No R
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new heated seat switch. TEST the system for normal operation.

No
REPAIR circuit 57 (BK). TEST the system for normal operation.
O3 CHECK CIRCUIT 1445 (RD/LG) FOR VOLTAGE TO THE HEATED SEAT MODULE
  • Measure the voltage between left rear heated seat module C3162-12, circuit 1445 (RD/LG), harness side and ground.
    • Yes GO to O4 . No VERIFY BJB fuse 2 (20A) is OK. If OK, REPAIR circuit 1445 (RD/
  • Is the voltage greater than 10 volts?
 Yes
GO to O4.

No
VERIFY BJB fuse 2 (20A) is OK. If OK, REPAIR circuit 1445 (RD/LG). TEST the system for normal operation.
O4 CHECK CIRCUIT 1040 (RD/BK) FOR VOLTAGE TO THE HEATED SEAT MODULE
  • Key in ON position.
  • Measure the voltage between left rear heated seat module C3162-5, circuit 1040 (RD/BK), harness side and ground.
    • Yes GO to O5 . No VERIFY CJB fuse 17 (10A) is OK. If OK, REPAIR circuit 1040 (RD
  • Is the voltage greater than 10 volts?
 Yes
GO to O5.

No
VERIFY CJB fuse 17 (10A) is OK. If OK, REPAIR circuit 1040 (RD/BK). TEST the system for normal operation.
O5 CHECK HEATED SEAT MODULE GROUND CIRCUIT 57 (BK)
  • Key in OFF position.
  • Measure the resistance between left rear heated seat module C3162-1, circuit 57 (BK), harness side and ground.
    • Yes GO to O6 . No REPAIR circuit 57 (BK). TEST the system for normal operation.
  • Is the resistance less than 5 ohms?
 Yes
GO to O6.

No
REPAIR circuit 57 (BK). TEST the system for normal operation.
O6 CHECK THE SEAT CUSHION HEATER AND THE SEAT BACK HEATER CIRCUITS
  • Measure the resistance between left rear heated seat module C3162-6, circuit 1064 (YE/LB) harness side and C3162-7, circuit 1065 (WH/LB), harness side; and between left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and ground.
    • Yes GO to O7 . No GO to O13 .
  • Is the resistance greater than 1.6 ohms and less than 10 ohms between C3162-6 and C3162-7 and greater than 10,000 ohms between C3162-6 and ground?
 Yes
GO to O7.

No
GO to O13.
O7 CHECK THE SEAT CUSHION HEATER AND THE SEAT BACK HEATER CIRCUITS FOR A SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and ground and between C3162-7, circuit 1065 (WH/LB), harness side and ground.
    • Yes GO to O8 . No GO to O9 .
  • Is voltage present on either circuit?
 Yes
GO to O8.

No
GO to O9.
O8 CHECK CIRCUIT 1064 (YE/LB) AND CIRCUIT 1065 (WH/LB) FOR A SHORT TO VOLTAGE
  • Key in OFF position.
  • Disconnect: Left Rear Seat Back Heater C3168.
  • Key in ON position.
  • Measure the voltage between left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and ground and between C3162-7, circuit 1065 (WH/LB), harness side and ground.
    • Yes REPAIR the affected circuit. TEST the system for normal operation. No REPAIR
  • Is voltage present on either circuit?
 Yes
REPAIR the affected circuit. TEST the system for normal operation.

No
REPAIR circuit 1064 (YE/LB) between the left rear seat cushion heater C3167 and the left rear seat back heater C3168. TEST the system for normal operation.
O9 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Measure the voltage between left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and ground and between C3162-4, circuit 1060 (BK/LB), harness side and ground.
    • Yes REPAIR the affected circuit. TEST the system for normal operation. No GO to
  • Is voltage present on either circuit?
 Yes
REPAIR the affected circuit. TEST the system for normal operation.

No
GO to O10.
O10 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUITS
  • Key in OFF position.
  • Measure the resistance between left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and C3162-4, circuit 1060 (BK/LB), harness side; and between left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and ground.
    • Yes INSTALL a new left rear heated seat module. TEST the system for normal opera
  • Is the resistance less than 300,000 ohms and greater than 50 ohms between C3162-3 and C3162-4 and greater than 10,000 ohms between C3162-3 and ground?
 Yes
INSTALL a new left rear heated seat module. TEST the system for normal operation.

No
GO to O11.
O11 CHECK CIRCUIT 1061 (BN/LB) FOR AN OPEN OR SHORT TO GROUND
  • Disconnect: Left Rear Seat Cushion Heater C3167.
  • Measure the resistance between left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and left rear seat cushion heater C3167-3, circuit 1061 (BN/LB), harness side; and between left rear heated seat module C3162-3, circuit 1061 (BN/LB), harness side and ground.
    • Yes GO to O12 . No REPAIR circuit 1061 (BN/LB). TEST the system for normal opera
  • Is the resistance less than 5 ohms between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
GO to O12.

No
REPAIR circuit 1061 (BN/LB). TEST the system for normal operation.
O12 CHECK CIRCUIT 1060 (BK/LB) FOR AN OPEN OR SHORT TO GROUND
  • Measure the resistance between left rear heated seat module C3162-4, circuit 1060 (BK/LB), harness side and left rear seat cushion heater C3167-2, circuit 1060 (BK/LB), harness side; and between left rear heated seat module C3162-4, circuit 1060 (BK/LB), harness side and ground.
    • Yes INSTALL a new left rear seat cushion heater. TEST the system for normal oper
  • Is the resistance less than 5 ohms between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
INSTALL a new left rear seat cushion heater. TEST the system for normal operation.

No
REPAIR circuit 1060 (BK/LB). TEST the system for normal operation.
O13 CHECK CIRCUIT 1064 (YE/LB) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Left Rear Seat Cushion Heater C3167.
  • Measure the resistance between left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and left rear seat cushion heater C3167-1, circuit 1064 (YE/LB), harness side; and between left rear heated seat module C3162-6, circuit 1064 (YE/LB), harness side and ground.
    • Yes GO to O14 . No REPAIR circuit 1064 (YE/LB). TEST the system for normal opera
  • Is the resistance less than 1 ohm between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
GO to O14.

No
REPAIR circuit 1064 (YE/LB). TEST the system for normal operation.
O14 CHECK CIRCUIT 1065 (WH/LB) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Left Rear Seat Back Heater C3168.
  • Measure the resistance between left rear heated seat module C3162-7, circuit 1065 (WH/LB), harness side and left rear seat back heater C3168-1, circuit 1065 (WH/LB), harness side; and between left rear heated seat module C3162-7, circuit 1065 (WH/LB), harness side and ground.
    • Yes GO to O15 . No REPAIR circuit 1065 (WH/LB). TEST the system for normal opera
  • Is the resistance less than 1 ohm between the heated seat module and the seat back heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
GO to O15.

No
REPAIR circuit 1065 (WH/LB). TEST the system for normal operation.
O15 CHECK CIRCUIT 1064 (YE/LB) FOR OPEN OR SHORT TO GROUND BETWEEN THE HEATED SEAT MODULE AND THE SEAT BACK HEATER
  • Measure the resistance between left rear seat cushion heater C3167-4, circuit 1064 (YE/LB), harness side and left rear seat back heater C3168-2, circuit 1064 (YE/LB), harness side; and between left rear seat cushion heater C3167-4, circuit 1064 (YE/LB), harness side and ground.
    • Yes GO to O16 . No REPAIR circuit 1064 (YE/LB). TEST the system for normal opera
  • Is the resistance less than 1 ohm between the seat cushion heater and the seat back heater and greater than 10,000 ohms between the seat cushion heater and ground?
 Yes
GO to O16.

No
REPAIR circuit 1064 (YE/LB). TEST the system for normal operation.
O16 CHECK THE SEAT BACK HEATER
  • Measure the resistance between left rear seat back heater C3168-1 and C3168-2, seat back heater component side.
    • Yes INSTALL a new left rear seat cushion heater. TEST the system for normal oper
  • Is the resistance between 0.7 and 1.0 ohm?
 Yes
INSTALL a new left rear seat cushion heater. TEST the system for normal operation.

No
INSTALL a new left rear seat back heater. TEST the system for normal operation.

Pinpoint Test P: The Heated Seat Is Inoperative — Right Rear

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

Normal Operation

The right rear heated seat module receives battery voltage feed on circuit 1445 (RD/GN), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 57 (BK). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 581 (RD) to command the system ON or OFF in HI heat mode or circuit 1256 (WH/YE) to command the system ON or OFF in LOW heat mode. When commanded ON, a ground signal is supplied to the heated seat switch from the heated seat module on either circuit 580 (BN) (HIGH heat mode) or circuit 579 (BK/OG) (LOW heat mode) illuminating the switch indicator. The heated seat module also supplies voltage to the cushion and backrest heater mats on circuit 1064 (YE/LB) and ground to the heater mats on circuit 1065 (WH/LB). 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 1060 (BK/LB) and monitors the return signal from the temperature sensor on circuit 1061 (BN/LB) for adjusting the 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 the time-out period occurs.

Possible Causes

An inoperative right rear heated seat can be caused by:

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

PINPOINT TEST P: THE HEATED SEAT IS INOPERATIVE — RIGHT REAR

Test Step Result / Action to Take
P1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE
  • Key in OFF position.
  • Disconnect: Right Rear Heated Seat Module C3163.
  • Measure the resistance between right rear heated seat module C3163-8, circuit 581 (RD), and C3163-11, circuit 1256 (WH/YE), harness side and ground while pressing the heated seat switch.
    • Yes GO to P3 . No GO to P2 .
  • Are the resistances less than 5 ohms when the heated seat switch is pressed?
 Yes
GO to P3.

No
GO to P2.
P2 CHECK HEATED SEAT SWITCH GROUND CIRCUIT 57 (BK)
  • Disconnect: Right Rear Heated Seat Switch C822.
  • Measure the resistance between right rear heated seat switch C822-1, circuit 57 (BK), harness side and ground.
    • Yes INSTALL a new heated seat switch. TEST the system for normal operation. No R
  • Is the resistance less than 5 ohms?
 Yes
INSTALL a new heated seat switch. TEST the system for normal operation.

No
REPAIR circuit 57 (BK). TEST the system for normal operation.
P3 CHECK CIRCUIT 1445 (RD/LG) FOR VOLTAGE TO THE HEATED SEAT MODULE
  • Measure the voltage between right rear heated seat module C3163-12, circuit 1445 (RD/LG), harness side and ground.
    • Yes GO to P4 . No VERIFY BJB fuse 2 (20A) is OK. If OK, REPAIR circuit 1445 (RD/
  • Is the voltage greater than 10 volts?
 Yes
GO to P4.

No
VERIFY BJB fuse 2 (20A) is OK. If OK, REPAIR circuit 1445 (RD/LG). TEST the system for normal operation.
P4 CHECK CIRCUIT 1040 (RD/BK) FOR VOLTAGE TO THE HEATED SEAT MODULE
  • Key in ON position.
  • Measure the voltage between right rear heated seat module C3163-5, circuit 1040 (RD/BK), harness side and ground.
    • Yes GO to P5 . No VERIFY CJB fuse 17 (10A) is OK. If OK, REPAIR circuit 1040 (RD
  • Is the voltage greater than 10 volts?
 Yes
GO to P5.

No
VERIFY CJB fuse 17 (10A) is OK. If OK, REPAIR circuit 1040 (RD/BK). TEST the system for normal operation.
P5 CHECK HEATED SEAT MODULE GROUND CIRCUIT 57 (BK)
  • Key in OFF position.
  • Measure the resistance between right rear heated seat module C3163-1, circuit 57 (BK), harness side and ground.
    • Yes GO to P6 . No REPAIR circuit 57 (BK). TEST the system for normal operation.
  • Is the resistance less than 5 ohms?
 Yes
GO to P6.

No
REPAIR circuit 57 (BK). TEST the system for normal operation.
P6 CHECK THE SEAT CUSHION HEATER AND THE SEAT BACK HEATER CIRCUITS
  • Measure the resistance between right rear heated seat module C3163-6, circuit 1064 (YE/LB) harness side and C3163-7, circuit 1065 (WH/LB), harness side; and between right rear heated seat module C3163-6, circuit 1064 (YE/LB), harness side and ground.
    • Yes GO to P7 . No GO to P13 .
  • Is the resistance greater than 1.6 ohms and less than 10 ohms between C3163-6 and C3163-7 and greater than 10,000 ohms between C3163-6 and ground?
 Yes
GO to P7.

No
GO to P13.
P7 CHECK THE SEAT CUSHION HEATER AND THE SEAT BACK HEATER CIRCUITS FOR A SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between right rear heated seat module C3163-6, circuit 1064 (YE/LB), harness side and ground and between C3163-7, circuit 1065 (WH/LB), harness side and ground.
    • Yes GO to P8 . No GO to P9 .
  • Is voltage present on either circuit?
 Yes
GO to P8.

No
GO to P9.
P8 CHECK CIRCUIT 1064 (YE/LB) AND CIRCUIT 1065 (WH/LB) FOR A SHORT TO VOLTAGE
  • Key in OFF position.
  • Disconnect: Right Rear Seat Back Heater C3170.
  • Key in ON position.
  • Measure the voltage between right rear heated seat module C3163-6, circuit 1064 (YE/LB), harness side and ground and between C3163-7, circuit 1065 (WH/LB), harness side and ground.
    • Yes REPAIR the affected circuit. TEST the system for normal operation. No REPAIR
  • Is voltage present on either circuit?
 Yes
REPAIR the affected circuit. TEST the system for normal operation.

No
REPAIR circuit 1064 (YE/LB) between the right rear seat cushion heater C3164 and the right rear seat back heater C3170. TEST the system for normal operation.
P9 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
  • Measure the voltage between right rear heated seat module C3163-3, circuit 1061 (BN/LB), harness side and ground and between C3163-4, circuit 1060 (BK/LB), harness side and ground.
    • Yes REPAIR the affected circuit. TEST the system for normal operation. No GO to
  • Is voltage present on either circuit?
 Yes
REPAIR the affected circuit. TEST the system for normal operation.

No
GO to P10.
P10 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUITS
  • Key in OFF position.
  • Measure the resistance between right rear heated seat module C3163-3, circuit 1061 (BN/LB), harness side and C3163-4, circuit 1060 (BK/LB), harness side; and between right rear heated seat module C3163-3, circuit 1061 (BN/LB), harness side and ground.
    • Yes INSTALL a new right rear heated seat module. TEST the system for normal oper
  • Is the resistance less than 300,000 ohms and greater than 50 ohms between C3163-3 and C3163-4 and greater than 10,000 ohms between C3163-3 and ground?
 Yes
INSTALL a new right rear heated seat module. TEST the system for normal operation.

No
GO to P11.
P11 CHECK CIRCUIT 1061 (BN/LB) FOR AN OPEN OR SHORT TO GROUND
  • Disconnect: Right Rear Seat Cushion Heater C3169.
  • Measure the resistance between right rear heated seat module C3163-3, circuit 1061 (BN/LB), harness side and right rear seat cushion heater C3169-3, circuit 1061 (BN/LB), harness side; and between right rear heated seat module C3163-3, circuit 1061 (BN/LB), harness side and ground.
    • Yes GO to P12 . No REPAIR circuit 1061 (BN/LB). TEST the system for normal opera
  • Is the resistance less than 5 ohms between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
GO to P12.

No
REPAIR circuit 1061 (BN/LB). TEST the system for normal operation.
P12 CHECK CIRCUIT 1060 (BK/LB) FOR AN OPEN OR SHORT TO GROUND
  • Measure the resistance between right rear heated seat module C3163-4, circuit 1060 (BK/LB), harness side and right rear seat cushion heater C3169-2, circuit 1060 (BK/LB), harness side; and between right rear heated seat module C3163-4, circuit 1060 (BK/LB), harness side and ground.
    • Yes INSTALL a new right rear seat cushion heater. TEST the system for normal ope
  • Is the resistance less than 5 ohms between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
INSTALL a new right rear seat cushion heater. TEST the system for normal operation.

No
REPAIR circuit 1060 (BK/LB). TEST the system for normal operation.
P13 CHECK CIRCUIT 1064 (YE/LB) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Right Rear Seat Cushion Heater C3169.
  • Measure the resistance between right rear heated seat module C3163-6, circuit 1064 (YE/LB), harness side and right rear seat cushion heater C3169-1, circuit 1064 (YE/LB), harness side; and between right rear heated seat module C3163-6, circuit 1064 (YE/LB), harness side and ground.
    • Yes GO to P14 . No REPAIR circuit 1064 (YE/LB). TEST the system for normal opera
  • Is the resistance less than 1 ohm between the heated seat module and the seat cushion heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
GO to P14.

No
REPAIR circuit 1064 (YE/LB). TEST the system for normal operation.
P14 CHECK CIRCUIT 1065 (WH/LB) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Right Rear Seat Back Heater C3170.
  • Measure the resistance between right rear heated seat module C3163-7, circuit 1065 (WH/LB), harness side and right rear seat back heater C3170-1, circuit 1065 (WH/LB), harness side; and between right rear heated seat module C3163-7, circuit 1065 (WH/LB), harness side and ground.
    • Yes GO to P15 . No REPAIR circuit 1065 (WH/LB). TEST the system for normal opera
  • Is the resistance less than 1 ohm between the heated seat module and the seat back heater and greater than 10,000 ohms between the heated seat module and ground?
 Yes
GO to P15.

No
REPAIR circuit 1065 (WH/LB). TEST the system for normal operation.
P15 CHECK CIRCUIT 1064 (YE/LB) FOR OPEN OR SHORT TO GROUND BETWEEN THE HEATED SEAT MODULE AND THE SEAT BACK HEATER
  • Measure the resistance between right rear seat cushion heater C3169-4, circuit 1064 (YE/LB), harness side and right rear seat back heater C3170-2, circuit 1064 (YE/LB), harness side; and between right rear seat cushion heater C3169-4, circuit 1064 (YE/LB), harness side and ground.
    • Yes GO to P16 . No REPAIR circuit 1064 (YE/LB). TEST the system for normal opera
  • Is the resistance less than 1 ohm between the seat cushion heater and the seat back heater and greater than 10,000 ohms between the seat cushion heater and ground?
 Yes
GO to P16.

No
REPAIR circuit 1064 (YE/LB). TEST the system for normal operation.
P16 CHECK THE SEAT BACK HEATER
  • Measure the resistance between right rear seat back heater C3170-1 and C3170-2, seat back heater component side.
    • Yes INSTALL a new right rear seat cushion heater. TEST the system for normal ope
  • Is the resistance between 0.7 and 1.0 ohm?
 Yes
INSTALL a new right rear seat cushion heater. TEST the system for normal operation.

No
INSTALL a new right rear seat back heater. TEST the system for normal operation.

Pinpoint Test Q: The Heated Seat Is Inoperative — Left Rear, Does Not Operate In High

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

Normal Operation

The left rear heated seat module receives battery voltage feed on circuit 1445 (RD/LG), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 57 (BK). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1020 (DG/PK) to command the system ON or OFF (HIGH heat mode).

Possible Causes

A left rear heated seat that does not operate in HI can be caused by:

  • faulty wiring, terminals or connectors.
  • a faulty heated seat switch.
  • a faulty heated seat module.

PINPOINT TEST Q: THE HEATED SEAT IS INOPERATIVE — LEFT REAR, DOES NOT OPERATE IN HIGH

Test Step Result / Action to Take
Q1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE
  • Key in OFF position.
  • Disconnect: Left Rear Heated Seat Module C3162.
  • Measure the resistance between left rear heated seat module C3162-8, circuit 1020 (DG/VT), harness side and ground while pressing the heated seat switch.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. No G
  • Is the resistance less than 5 ohms when the heated seat switch is pressed?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation.

No
GO to Q2.
Q2 CHECK CIRCUIT 1020 (DG/VT) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Left Rear Heated Seat Switch C722.
  • Measure the resistance between left rear heated seat switch C722-6, circuit 1020 (DG/VT), harness side and left rear heated seat module C3162-8, circuit 1020 (DG/VT), harness side; and between left rear heated seat switch C722-6, circuit 1020 (DG/VT), harness side and ground.
    • Yes GO to Q3 . No REPAIR circuit 1020 (DG/VT). TEST the system for normal operat
  • Is the resistance less than 5 ohms between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
 Yes
GO to Q3.

No
REPAIR circuit 1020 (DG/VT). TEST the system for normal operation.
Q3 CHECK CIRCUIT 1020 (DG/VT) FOR SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between left rear heated seat module C3162-8, circuit 1020 (DG/VT), harness side and ground.
    • Yes INSTALL a new heated seat switch. TEST the system for normal operation. No R
  • Is voltage present on circuit 1020 (DG/VT)?
 Yes
INSTALL a new heated seat switch. TEST the system for normal operation.

No
REPAIR circuit 1020 (DG/VT). TEST the system for normal operation.

Pinpoint Test R: The Heated Seat Is Inoperative — Left Rear, Does Not Operate In Low

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

Normal Operation

The left rear heated seat module receives battery voltage feed on circuit 1445 (RD/LG), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 57 (BK). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1255 (WH/RD) to command the system ON or OFF (LOW heat mode).

Possible Causes

A left rear heated seat that does not operate in LOW can be caused by:

  • faulty wiring, terminals or connectors.
  • a faulty heated seat switch.
  • a faulty heated seat module.

PINPOINT TEST R: THE HEATED SEAT IS INOPERATIVE — LEFT REAR, DOES NOT OPERATE IN LOW

Test Step Result / Action to Take
R1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE
  • Key in OFF position.
  • Disconnect: Left Rear Heated Seat Module C3162.
  • Measure the resistance between left rear heated seat module C3162-12, circuit 1255 (WH/RD), harness side and ground while pressing the heated seat switch.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. No G
  • Is the resistance less than 5 ohms when the heated seat switch is pressed?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation.

No
GO to R2.
R2 CHECK CIRCUIT 1255 (WH/RD) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Left Rear Heated Seat Switch C722.
  • Measure the resistance between left rear heated seat switch C722-2, circuit 1255 (WH/RD), harness side and left rear heated seat module C3162-11, circuit 1255 (WH/RD), harness side; and between left rear heated seat switch C722-2, circuit 1255 (WH/RD), harness side and ground.
    • Yes GO to R3 . No REPAIR circuit 1255 (WH/RD). TEST the system for normal operat
  • Is the resistance less than 5 ohms between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
 Yes
GO to R3.

No
REPAIR circuit 1255 (WH/RD). TEST the system for normal operation.
R3 CHECK CIRCUIT 1255 (WH/RD) FOR SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between left rear heated seat module C3162-11, circuit 1255 (WH/RD), harness side and ground.
    • Yes INSTALL a new heated seat switch. TEST the system for normal operation. No R
  • Is voltage present on circuit 1255 (WH/RD)?
 Yes
INSTALL a new heated seat switch. TEST the system for normal operation.

No
REPAIR circuit 1255 (WH/RD). TEST the system for normal operation.

Pinpoint Test S: The Heated Seat Is Inoperative — Right Rear, Does Not Operate In High

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

Normal Operation

The right rear heated seat module receives battery voltage feed on circuit 1445 (RD/LG), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 57 (BK). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 581 (RD) to command the system ON or OFF (HIGH heat mode).

Possible Causes

A right rear heated seat that does not operate in HI can be caused by:

  • faulty wiring, terminals or connectors.
  • a faulty heated seat switch.
  • a faulty heated seat module.

PINPOINT TEST S: THE HEATED SEAT IS INOPERATIVE — RIGHT REAR, DOES NOT OPERATE IN HIGH

Test Step Result / Action to Take
S1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE
  • Key in OFF position.
  • Disconnect: Right Rear Heated Seat Module C3163.
  • Measure the resistance between right rear heated seat module C3163-8, circuit 581 (RD), harness side and ground while pressing the heated seat switch.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. No G
  • Is the resistance less than 5 ohms when the heated seat switch is pressed?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation.

No
GO to S2.
S2 CHECK CIRCUIT 581 (RD), 1020 (DG/VT) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Right Rear Heated Seat Switch C822.
  • Measure the resistance between right rear heated seat switch C822-6, circuit 1020 (DG/VT), harness side and right rear heated seat module C3163-8, circuit 581 (RD), harness side; and between right rear heated seat switch C822-6, circuit 1020 (DG/VT), harness side and ground.
    • Yes GO to S3 . No REPAIR the affected circuit. TEST the system for normal operat
  • Is the resistance less than 5 ohms between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
 Yes
GO to S3.

No
REPAIR the affected circuit. TEST the system for normal operation.
S3 CHECK CIRCUIT 581 (RD) FOR SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between right rear heated seat module C3163-8, circuit 581 (RD), harness side and ground.
    • Yes INSTALL a new heated seat switch. TEST the system for normal operation. No R
  • Is voltage present on circuit 581 (RD)?
 Yes
INSTALL a new heated seat switch. TEST the system for normal operation.

No
REPAIR circuit 581 (RD). TEST the system for normal operation.

Pinpoint Test T: The Heated Seat Is Inoperative — Right Rear, Does Not Operate In Low

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

Normal Operation

The right rear heated seat module receives battery voltage feed on circuit 1445 (RD/LG), ignition voltage feed on circuit 1040 (RD/BK) and is supplied ground on circuit 57 (BK). When the heated seat control switch is pressed with the ignition switch in RUN or START, a ground signal is sent to the heated seat module on circuit 1256 (WH/YE) to command the system ON or OFF (LOW heat mode).

Possible Causes

A right rear heated seat that does not operate in LOW can be caused by:

  • faulty wiring, terminals or connectors.
  • a faulty heated seat switch.
  • a faulty heated seat module.

PINPOINT TEST T: THE HEATED SEAT IS INOPERATIVE — RIGHT REAR, DOES NOT OPERATE IN LOW

Test Step Result / Action to Take
T1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE
  • Key in OFF position.
  • Disconnect: Right Rear Heated Seat Module C3163.
  • Measure the resistance between right rear heated seat module C3163-11, circuit 1256 (WH/YE), harness side and ground while pressing the heated seat switch.
    • Yes INSTALL a new heated seat module. TEST the system for normal operation. No G
  • Is the resistance less than 5 ohms when the heated seat switch is pressed?
 Yes
INSTALL a new heated seat module. TEST the system for normal operation.

No
GO to T2.
T2 CHECK CIRCUIT 1256 (WH/YE), 1255 (WH/RD) FOR OPEN OR SHORT TO GROUND
  • Disconnect: Right Rear Heated Seat Switch C822.
  • Measure the resistance between right rear heated seat switch C822-2, circuit 1255 (WH/RD), harness side and right rear heated seat module C3163-11, circuit 1256 (WH/YE), harness side; and between right rear heated seat switch C822-2, circuit 1255 (WH/RD), harness side and ground.
    • Yes GO to T3 . No REPAIR the affected circuit. TEST the system for normal operat
  • Is the resistance less than 5 ohms between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground?
 Yes
GO to T3.

No
REPAIR the affected circuit. TEST the system for normal operation.
T3 CHECK CIRCUIT 1256 (WH/YE) FOR SHORT TO VOLTAGE
  • Key in ON position.
  • Measure the voltage between right rear heated seat module C3163-11, circuit 1256 (WH/YE), harness side and ground.
    • Yes INSTALL a new heated seat switch. TEST the system for normal operation. No R
  • Is voltage present on circuit 1256 (WH/YE)?
 Yes
INSTALL a new heated seat switch. TEST the system for normal operation.

No
REPAIR circuit 1256 (WH/YE). TEST the system for normal operation.

Pinpoint Test U: The Power Lumbar Is Inoperative — Driver

Refer to Wiring Diagrams Cell 122, Power Lumbar Seats for schematic and connector information.

Normal Operation

The lumbar control switch is powered by battery voltage to circuit 566 (DG) and ground to circuit 57 (BK). The lumbar switch toggles voltage and ground directly to the lumbar motor circuits 1094 (PK) and 1097 (BN). The lumbar motor tightens or relaxes a cable connector to the lumbar adjuster.

Possible Causes

An inoperative power lumbar can be caused by:

  • a fuse.
  • a faulty circuit breaker.
  • a faulty circuit.
  • a faulty lumbar control switch.
  • a faulty lumbar assembly.

PINPOINT TEST U: THE POWER LUMBAR IS INOPERATIVE — DRIVER

Test Step Result / Action to Take
U1 CHECK CIRCUIT 566 (DG) 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Driver Lumbar Switch C361.
  • Measure the voltage between driver power lumbar switch C361-2, circuit 566 (DG), harness side and ground.
    • Yes GO to U2 . No VERIFY battery junction box (BJB) fuse 15 (15A) is OK. If OK,
  • Is the voltage greater than 10 volts?
 Yes
GO to U2.

No
VERIFY battery junction box (BJB) fuse 15 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
U2 CHECK CIRCUIT 57 (BK) FOR AN OPEN
  • Measure the resistance between driver power lumbar switch C361-3, circuit 57 (BK), harness side and ground; and between driver power lumbar switch C361-6, circuit 57 (BK), harness side and ground.
    • Yes GO to U3 . No REPAIR the circuit. TEST the system for normal operation. DISC
  • Are the resistances less than 5 ohms?
 Yes
GO to U3.

No
REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
U3 CHECK THE LUMBAR MOTOR
  • Connect: Driver Lumbar Switch C361.
  • Disconnect: Driver Lumbar Motor C366.
  • Measure the voltage between driver power lumbar motor C366-2, circuit 1097 (BN) and C366-1, circuit 1094 (PK), harness side.
    • Yes INSTALL a new driver power lumbar motor. REFER to Lumbar Motor in this secti
  • Operate the driver power lumbar switch in both directions.
  • Is the voltage greater than 10 volts in both directions?
 Yes
INSTALL a new driver power lumbar motor. REFER to Lumbar Motor in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
GO to U4.
U4 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR A SHORT TO GROUND
  • Disconnect: Driver Lumbar Switch C361.
  • Measure the resistance between driver power lumbar switch C361-1, circuit 1097 (BN), harness side and ground; and between driver power lumbar switch C361-7, circuit 1094 (PK), harness side and ground.
    • Yes GO to U5 . No REPAIR the circuit. TEST the system for normal operation. DISC
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to U5.

No
REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.
U5 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR AN OPEN
  • Measure the resistance between driver power lumbar switch C361-1, circuit 1097 (BN), harness side and driver power lumbar motor C366-2, circuit 1097 (BN), harness side; and between driver power lumbar switch C361-7, circuit 1094 (PK), harness side and driver power lumbar motor C366-1, circuit 1094 (PK), harness side.
    • Yes INSTALL a new driver power lumbar switch. REFER to Lumbar Control Switch in
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new driver power lumbar switch. REFER to Lumbar Control Switch in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test V: The Power Lumbar Is Inoperative — Passenger

Refer to Wiring Diagrams Cell 122, Power Lumbar Seats for schematic and connector information.

Normal Operation

The lumbar control switch is powered by battery voltage to circuit 566 (DG) and ground to circuit 57 (BK). The lumbar switch toggles voltage and ground directly to the lumbar motor circuits 1094 (PK) and 1097 (BN). The lumbar motor tightens or relaxes a cable connector to the lumbar adjuster.

Possible Causes

An inoperative power lumbar can be caused by:

  • a faulty circuit breaker.
  • a faulty circuit.
  • a faulty lumbar control switch.
  • a faulty lumbar assembly.

PINPOINT TEST V: THE POWER LUMBAR IS INOPERATIVE — PASSENGER

Test Step Result / Action to Take
V1 CHECK CIRCUIT 566 (DG) 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Passenger Seat Side Air Bag C316.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Passenger Seat Side Air Bag C316.
  • 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.
  • Connect the battery ground cable.
  • Disconnect: Passenger Lumbar Switch C331.
  • Measure the voltage between passenger power lumbar switch C331-2, circuit 566 (DG), harness side and ground.
    • Yes GO to V2 . No VERIFY battery junction box (BJB) fuse 15 (15A) is OK. If OK,
  • Is the voltage greater than 10 volts?
 Yes
GO to V2.

No
VERIFY battery junction box (BJB) fuse 15 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
V2 CHECK CIRCUIT 57 (BK) FOR AN OPEN
  • Measure the resistance between passenger power lumbar switch C331-3, circuit 57 (BK), harness side and ground; and between passenger power lumbar switch C331-6, circuit 57 (BK), harness side and ground.
    • Yes GO to V3 . No REPAIR circuit. TEST the system for normal operation. DISCONNE
  • Are the resistances less than 5 ohms?
 Yes
GO to V3.

No
REPAIR circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
V3 CHECK THE LUMBAR MOTOR
  • Connect: Passenger Lumbar Switch C331.
  • Disconnect: Passenger Lumbar Motor C336.
  • Measure the voltage between passenger power lumbar motor C336-2, circuit 1097 (BN) and C336-1, circuit 1094 (PK).
    • Yes INSTALL a new passenger power lumbar motor. REFER to Lumbar Motor in this se
  • Operate the passenger power lumbar switch in both directions.
  • Is the voltage greater than 10 volts in both directions?
 Yes
INSTALL a new passenger power lumbar motor. REFER to Lumbar Motor in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
GO to V4.
V4 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR A SHORT TO GROUND
  • Disconnect: Passenger Lumbar Switch C331.
  • Measure the resistance between passenger power lumbar switch C331-1, circuit 1097 (BN), harness side and ground; and between passenger power lumbar switch C331-7, circuit 1094 (PK), harness side and ground.
    • Yes GO to V5 . No REPAIR the circuit. TEST the system for normal operation. DISC
  • Are the resistances greater than 10,000 ohms?
 Yes
GO to V5.

No
REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.
V5 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR AN OPEN
  • Measure the resistance between passenger power lumbar switch C331-1, circuit 1097 (BN), harness side and passenger power lumbar motor C336-2, circuit 1097 (BN), harness side; and between passenger power lumbar switch C331-7, circuit 1094 (PK), harness side and passenger power lumbar motor C336-1, circuit 1094 (PK), harness side.
    • Yes INSTALL a new passenger power lumbar switch. REFER to Lumbar Control Switch
  • Are the resistances less than 5 ohms?
 Yes
INSTALL a new passenger power lumbar switch. REFER to Lumbar Control Switch in this section. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

No
REPAIR the circuit. TEST the system for normal operation. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag C316. CONNECT passenger seat side air bag C316. REPOWER the SRS. REFER to Section 501-20B.

Pinpoint Test W: DTC B1676; Battery Voltage Out Of Range

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

Normal Operation

The DSM is powered by battery voltage from circuit 490 (RD) and is supplied ground on circuit 57 (BK). The DSM monitors the supply voltage input for correct operation. If the module supply voltage is not between 11.5 and 16 volts while in operation, DTC B1676 may result.

Possible Causes

DTC B1676 battery pack voltage out of range can be caused by:

  • faulty wiring, terminals or connectors.
  • low battery voltage.
  • a faulty charging system.
  • a faulty DSM.

PINPOINT TEST W: DTC B1676; BATTERY VOLTAGE OUT OF RANGE

Test Step Result / Action to Take
W1 CHECK FOR RELATED 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: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered. NOTE: The air bag warning lamp illuminates when the restraint control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  • Key in OFF position.
  • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Section 501-20B.
  • Disconnect: Driver Seat Side Air Bag C315.
  • Connect: Restraint System Diagnostic Tool 418-133 to the Driver Seat Side Air Bag C315.
  • 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.
  • Connect the battery ground cable.
  • Enter the following diagnostic mode on the diagnostic tool: Clear Driver Seat Module (DSM) DTCs.
  • Enter the following diagnostic mode on the diagnostic tool: DSM Self-Test.
  • Was DSM DTC B2316 retrieved?
 Yes
REFER to the Diagnostic Trouble Code (DTC) Index in Section 501-09 to diagnose the DSM concern.

No
GO to W2.
W2 CHECK FOR VOLTAGE AT DRIVER SEAT MODULE (DSM)
  • Key in OFF position.
  • Disconnect: DSM C341b.
  • Key in ON position.
  • Measure the voltage between DSM connector C341b-2, circuit 490 (RD), harness side and ground.
    • Yes CLEAR the DSM DTCs. CARRY OUT the DSM Self-Test. If DTC B1676 is retrieved,
  • Is the voltage between 11.5 and 16 volts?
 Yes
CLEAR the DSM DTCs. CARRY OUT the DSM Self-Test. If DTC B1676 is retrieved, INSTALL a new DSM module. REFER to Section 419-10 for additional information. REPEAT the self-test, CLEAR the DTCs.

Otherwise, the system is operating correctly at this time. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

No
REFER to Section 414-02 to diagnose the charging system concern. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag C315. CONNECT driver seat side air bag C315. REPOWER the SRS. REFER to Section 501-20B.

Parts & tools for this job For 2007 Lincoln Town Car

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