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Mondeo 2007.5 (02.2007-)

Mechanical Repairs > 5 Body and Paint > 501 Body and Paint > 501-10 Seating > Description and Operation > Diagnosis and Testing > Seats

Seating - Seats Mondeo 2007.5 (02/2007-)
Diagnosis and Testing

For Wiring Schematics and Connector Information, refer to the Wiring Diagram Cell 501-10.

Principals of Operation

The vehicle is equipped with either manually adjusted seats, bidirectional power height adjusted seats or full eight-way power adjusted seats for both driver and passenger. Vehicles equipped with the full eight-way power seat functionality are controlled by a single multifunction switch. In each power seat the switch is mounted onto the seat base panel within easy reach of the occupant.

Seats with power height adjustment retain manual adjustment controls to attain seat adjustment. The bidirectional switch controls the operation of a single motor which depending on switch operation will either raise or lower the seat height through a series of mechanical linkages.

Seats with full eight-way adjustment are able to adjust the seat position through any one of four different motors. Each seat function is controlled by a single multifunction switch, which in turn controls the operation of the bidirectional motor of the selected adjustment feature to achieve:

  • Vertical adjustment of the front of the seat cushion;
  • Vertical adjustment of the rear of the seat cushion;
  • Horizontal seat movement along the seat track through a mechanical worm drive;
  • Seat backrest position adjustment of the backrest rake angle.

The driver seat with full eight-way power adjusted seats may have an option of driver seat memory. This option has an eight-way memory seat switch, additional memory motors and a memory module.

Heated rear seats are controlled by switches mounted onto the floor console rear panel. The heated backrest and cushion are controlled by a module located with the cushion heater mat.

Inspection and Verification

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

Visual Inspection Chart

Mechanical Electrical
  • Damaged switch(es).
  • Obstruction of ventilated seat air intake.
  • Fuse(s).
  • Wiring harness.
  • Electrical connector(s).
  • Motor(s).
  • Switch(es).
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
  1. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart.

Symptom Chart

Symptom Possible Sources Action
The power seat is inoperative
*
Seat switch.
*
CARRY OUT the Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit(s).
*
Motor(s).
*
GO to Pinpoint Test A.
The power seat does not move horizontally
*
Seat switch.
*
CARRY OUT the Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit(s).
*
Motor(s).
*
GO to Pinpoint Test B.
The power seat does not move vertically
*
Seat switch.
*
CARRY OUT the Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit(s).
*
Motor(s)
*
GO to Pinpoint Test C.
The power seat does not recline
*
Seat switch.
*
CARRY OUT the Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit.
*
Motor.
*
GO to Pinpoint Test D.
The heated seats are inoperative
*
Heated seat switch(es).
*
CARRY OUT the Heated Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit(s).
*
GO to Pinpoint Test E.
The heated seat is inoperative
*
Heated seat switch(es).
*
CARRY OUT the Heated Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit(s).
*
GO to Pinpoint Test F.
All climate controlled seats are inoperative/do not operate correctly
*
Heated seat switch(es).
*
CARRY OUT the Heated Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit(s).
*
GO to Pinpoint Test G.
A single climate controlled seat is inoperative/does not operate correctly
*
Heated seat switch(es).
*
CARRY OUT the Heated Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit(s).
*
GO to Pinpoint Test H.
The heated seat is inoperative - Rear seat
*
Heated rear seat switch(es).
*
CARRY OUT the Heated Rear Seat Switch Component Test. REFER to the Wiring Diagrams.
*
Circuit(s).
*
GO to Pinpoint Test I.

Pinpoint Tests

PINPOINT TEST A : THE POWER SEAT IS INOPERATIVE - FRONT SEAT

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: CHECK THE VOLTAGE TO THE POWER SEAT SWITCH
1
Disconnect Inoperative Power Seat Switch C33-L or C33-M.
2
Ignition switch in position II.

NOTE:
NOTE:Carry out the measurements on the inoperative seat.
3
Measure the voltage between the:
  • Driver power seat switch C33-L pin 15, circuit SBR10A (YE/RD) harness side and ground.
  • Passenger power seat switch C33-M pin 15, circuit B_SBR09A (RD) harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit SBR10A (YE/RD) or circuit B_SBR09A (RD). TEST the system for normal operation.
A2: CHECK THE VOLTAGE TO THE DRIVER POWER SEAT MEMORY SWITCH
1
Disconnect Inoperative Power Seat Memory Switch C33-L.
2
Ignition switch in position II.

3
Measure the voltage between the:
  • Driver power seat memory switch C33-L pin 11, circuit C_SBR07A (WH/RD) harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit C_SBR07A (WH/RD). TEST the system for normal operation.
A3: CHECK THE POWER SEAT SWITCH GROUND CIRCUIT FOR CONTINUITY
1
Ignition switch in position 0.

NOTE:
NOTE:Carry out the measurements on the inoperative seat.
2
Measure the resistance between the:
  • Driver power seat switch C33-L pin 16, circuit GD149D (BK/GY) harness side and ground.
  • Passenger power seat switch C33-M pin 16, circuit GD151E (BK/GN) harness side and ground.

Is the resistance less than 5 ohms?
Yes
Eight-way power seat - INSTALL a new power seat switch. Two-way power seat - INSTALL a new power seat switch and motor.
No
REPAIR circuit GD149D (BK/GY) or circuit GD151E (BK/GN). TEST the system for normal operation.
A4: CHECK THE DRIVER POWER SEAT MEMORY SWITCH GROUND CIRCUIT FOR CONTINUITY
1
Ignition switch in position 0.

2
Measure the resistance between the:
  • Driver power seat memory switch C33-L pin 12, circuit GD135R (BK/GY) harness side and ground.

Is the resistance less than 5 ohms?
Yes
INSTALL a new power seat memory switch. TEST the system for normal operation.
No
REPAIR circuit GD135R (BK/GY). TEST the system for normal operation.

PINPOINT TEST B : THE POWER SEAT DOES NOT MOVE HORIZONTALLY - FRONT SEAT

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
B1: CHECK THE VOLTAGE TO THE SEAT HORIZONTAL MOTOR
1
Ignition switch in position 0.
2
Detach the seat assembly from the floor.
3
Disconnect Power Seat Horizontal Motor.
4
Ignition switch in position II.
5
Operate the power seat switch to the REARWARD position.

6
Measure the voltage between the power seat horizontal motor pin 1, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit. TEST the system for normal operation.
B2: CHECK THE VOLTAGE TO THE SEAT HORIZONTAL MEMORY MOTOR
1
Ignition switch in position 0.
2
Detach the seat assembly from the floor.
3
Disconnect Power Seat Horizontal Memory Motor.
4
Ignition switch in position II.
5
Operate the power seat memory switch to the REARWARD position.

6
Measure the voltage between the power seat horizontal memory motor pin 1, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit. TEST the system for normal operation.
B3: CHECK THE FORWARD VOLTAGE TO THE SEAT HORIZONTAL MOTOR
1
Operate the power seat switch to the FORWARD position.

2
Measure the voltage between the power seat horizontal motor pin 2, harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new seat horizontal motor.
REFER to: Front Seat (501-10 Seating, Removal and Installation).
TEST the system for normal operation.
No
REPAIR circuit. TEST the system for normal operation.
B4: CHECK THE FORWARD VOLTAGE TO THE SEAT HORIZONTAL MEMORY MOTOR
1
Operate the power seat memory switch to the FORWARD position.

2
Measure the voltage between the power seat horizontal memory motor pin 2, harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new seat horizontal memory module and motor.
REFER to: Front Seat (501-10 Seating, Removal and Installation).
TEST the system for normal operation.
No
REPAIR circuit. TEST the system for normal operation.

PINPOINT TEST C : THE POWER SEAT DOES NOT MOVE VERTICALLY

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
C1: CHECK THE SEAT HEIGHT MOTORS - FRONT SEAT
1
Adjust the front seat height.

Do both seat height motors operate?
Yes
VERIFY the customer concern.
No
If the front seat front height motor is inoperative - GO to C2.
If the front seat rear height motor is inoperative - GO to C6.
C2: CHECK THE VOLTAGE TO THE SEAT FRONT HEIGHT MOTOR
1
Ignition switch in position 0.
2
Detach the seat assembly from the floor.
3
Disconnect Power Seat Front Height Motor.
4
Ignition switch in position II.
5
Operate the power seat switch to the DOWN position.

6
Measure the voltage between the power seat switch pin 9, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit. TEST the system for normal operation.
C3: CHECK THE VOLTAGE TO THE SEAT FRONT HEIGHT MEMORY MOTOR
1
Ignition switch in position 0.
2
Detach the seat assembly from the floor.
3
Disconnect Power Seat Front Height Memory Motor.
4
Ignition switch in position II.
5
Operate the power seat memory switch to the DOWN position.

6
Measure the voltage between the power seat memory switch pin 9, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit. TEST the system for normal operation.
C4: CHECK THE VOLTAGE TO THE SEAT FRONT HEIGHT MOTOR (CONTINUED)
1
Operate the power seat switch to the UP position.

2
Measure the voltage between the power seat switch pin 10, harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new seat front height motor.
REFER to: Front Seat (501-10 Seating, Removal and Installation).
TEST the system for normal operation.
No
REPAIR circuit. TEST the system for normal operation.
C5: CHECK THE VOLTAGE TO THE SEAT FRONT HEIGHT MEMORY MOTOR (CONTINUED)
1
Operate the power seat memory switch to the UP position.

2
Measure the voltage between the power seat memory switch pin 10, harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new seat front height memory motor and module.
REFER to: Front Seat (501-10 Seating, Removal and Installation).
TEST the system for normal operation.
No
REPAIR circuit. TEST the system for normal operation.
C6: CHECK THE VOLTAGE TO THE SEAT REAR HEIGHT MOTOR
1
Ignition switch in position 0.
2
Detach the seat assembly from the floor.
3
Disconnect Power Seat Rear Height Motor.
4
Ignition switch in position II.
5
Operate the power seat switch to the DOWN position.

6
Measure the voltage between the power seat switch pin 7, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit. TEST the system for normal operation.
C7: CHECK THE VOLTAGE TO THE SEAT REAR HEIGHT MEMORY MOTOR
1
Ignition switch in position 0.
2
Detach the seat assembly from the floor.
3
Disconnect Power Seat Rear Height Memory Motor.
4
Ignition switch in position II.
5
Operate the power seat memory switch to the DOWN position.

6
Measure the voltage between the power seat memory switch pin 7, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit. TEST the system for normal operation.
C8: CHECK THE VOLTAGE TO THE SEAT REAR HEIGHT MOTOR (CONTINUED)
1
Operate the power seat switch to the UP position.

2
Measure the voltage between the power seat switch pin 8, harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new seat rear height motor.
REFER to: Front Seat (501-10 Seating, Removal and Installation).
TEST the system for normal operation.
No
REPAIR circuit. TEST the system for normal operation.
C9: CHECK THE VOLTAGE TO THE SEAT REAR HEIGHT MEMORY MOTOR (CONTINUED)
1
Operate the power seat memory switch to the UP position.

2
Measure the voltage between the power seat memory switch pin 8, harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new seat rear height memory motor and module.
REFER to: Front Seat (501-10 Seating, Removal and Installation).
TEST the system for normal operation.
No
REPAIR circuit. TEST the system for normal operation.

PINPOINT TEST D : THE POWER SEAT DOES NOT RECLINE - FRONT SEAT

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
D1: CHECK THE VOLTAGE TO THE SEAT BACKREST MOTOR
1
Ignition switch in position 0.
2
Detach the seat assembly from the floor.
3
Disconnect Power Seat Backrest Motor.
4
Ignition switch in position II.
5
Operate the power seat switch to the REARWARD position.

6
Measure the voltage between the power seat switch pin 1, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit. TEST the system for normal operation.
D2: CHECK THE VOLTAGE TO THE SEAT BACKREST MEMORY MOTOR
1
Ignition switch in position 0.
2
Detach the seat assembly from the floor.
3
Disconnect Power Seat Backrest Memory Motor.
4
Ignition switch in position II.
5
Operate the power seat memory switch to the REARWARD position.

6
Measure the voltage between the power seat memory switch pin 1, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit. TEST the system for normal operation.
D3: CHECK THE VOLTAGE TO THE SEAT BACKREST MOTOR (CONTINUED)
1
Operate the power seat switch to the FORWARD position.

2
Measure the voltage between the power seat switch pin 6, harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new seat backrest motor.
REFER to: Front Seat Backrest (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
No
REPAIR circuit. TEST the system for normal operation.
D4: CHECK THE VOLTAGE TO THE SEAT BACKREST MEMORY MOTOR (CONTINUED)
1
Operate the power seat memory switch to the FORWARD position.

2
Measure the voltage between the power seat memory switch pin 6, harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new seat backrest memory motor and module.
REFER to: Front Seat Backrest (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
No
REPAIR circuit. TEST the system for normal operation.

PINPOINT TEST E : THE HEATED SEATS ARE INOPERATIVE - FRONT SEAT

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
E1: CHECK FOR VOLTAGE TO THE HEATED SEAT SWITCH
1
Ignition switch in position II.
2
Operate the heated seat switch.

Does the heated seat switch LEDs illuminate?
Yes
No
E2: CHECK FOR VOLTAGE TO THE INOPERATIVE HEATED SEAT
1
Ignition switch in position 0.
2
Disconnect Left-hand Heated Seat C33-L or C33-M.
3
Ignition switch in position II.

4
Measure the voltage between the:
  • Left-hand side heated seat C33-L pin 9, circuit B_CBR03A (GY), harness side and ground.
  • Right-hand side heated seat C33-M pin 9, circuit B_CBR04A (VT), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
E3: CHECK FOR CONTINUITY BETWEEN THE HEATED SEAT SWITCH AND THE HEATED SEAT
1
Ignition switch in position 0.
2
Disconnect Heated Seat Switch C3HS29.

3
Measure the resistance between the:
  • Left-hand side heated seat C33-L pin 17, circuit CHS32C (BN), harness side and the heated seat switch C3HS29 pin 2, circuit CHS32B (BN), harness side.
  • Right-hand side heated seat C33-M pin 17, circuit CHS32A (BN), harness side and the heated seat switch C3HS29 pin 2, circuit CHS32B (BN), harness side.

Is the resistance less than 5 ohms?
Yes
VERIFY the customer concern.
No
REPAIR circuit CHS32B (BN). TEST the system for normal operation.
E4: CHECK THE HEATED SEAT SWITCH GROUND CIRCUIT
1
Ignition switch in position 0.

2
Measure the resistance between the heated seat switch C3HS29 pin 1, circuit GD133AP (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit GD133AP (BK). TEST the system for normal operation.
E5: CHECK FOR VOLTAGE TO THE HEATED SEAT SWITCH
1
Ignition switch in position II.

2
Measure the voltage between the:
  • Heated seat switch C3HS29 pin 4, circuit CBP04F (VT), harness side and ground.
  • Heated seat switch C3HS29 pin 6, circuit CBP17Y (BN/GN), harness side and ground.

Are the voltages greater than 10 volts?
Yes
INSTALL a new heated seat switch.
REFER to: Climate Controlled Seat Switch (501-10 Seating, Removal and Installation).
TEST the system for normal operation.
No
REPAIR circuit CBP04F (VT) or circuit CBP17Y (BN/GN). TEST the system for normal operation.
E6: CHECK THE HEATED SEAT RELAY GROUND CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Rear Junction Box Relay RB1.
3
Disconnect Central Junction Box (CJB) C1BP02-B.

4
Measure the resistance between the rear junction box relay RB1 pin 2, circuit CDC03A (BU), harness side and the CJB pin 45, circuit CDC03A (BU), harness side.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit CDC03A (BU). TEST the system for normal operation.
E7: CHECK FOR BATTERY VOLTAGE TO THE HEATED SEAT RELAY
1
Ignition switch in position II.

2
Measure the voltage between the:
  • Rear junction box relay RB1 pin 1, circuit SBR07D (GN/RD), harness side and ground.
  • Rear junction box relay RB1 pin 3, circuit SBB20P (GN/RD), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit SBR07D (GN/RD) or circuit SBB20P (GN/RD). TEST the system for normal operation.
E8: CHECK FOR CONTINUITY BETWEEN THE HEATED SEAT RELAY AND THE HEATED SEAT MODULE

1
Measure the resistance between the:
  • Rear junction box relay RB1 pin 5, circuit B_CBR03A (GY), harness side and the heated seat C33-L pin 9, harness side.
  • Rear junction box relay RB1 pin 5, circuit B_CBR04A (VT), harness side and the heated seat C33-M pin 9, harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new rear junction box relay. TEST the system for normal operation.
No
REPAIR circuit B_CBR03A (GY) or circuit B_CBR04A (VT). TEST the system for normal operation.

PINPOINT TEST F : THE HEATED SEAT IS INOPERATIVE - FRONT SEAT

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
F1: CHECK THE INOPERATIVE HEATED SEAT GROUND CIRCUIT
1
Disconnect Inoperative Heated Seat C33-L or C33-M.

2
Measure the resistance between the:

    Left-hand side

  • Heated seat C33-L pin 10, circuit GD149R (BK/GY), harness side and ground.
  • LHD driver heated seat C33-L pin 18, circuit GD135J (BK/GY), harness side and ground.

    Right-hand side

  • Heated seat C33-M pin 10, circuit GD151D (BK/GN), harness side and ground.
  • RHD driver heated seat C33-M pin 18, circuit GD135S (BK/GY), harness side and ground.

Is the resistance(s) less than 5 ohms?
Yes
No
REPAIR circuit GD135S (BK/GY), or circuit GD135J (BK/GY), or circuit GD149R (BK/GY), or circuit GD151D (BK/GN). TEST the system for normal operation.
F2: CHECK FOR VOLTAGE TO THE INOPERATIVE HEATED SEAT
1
Ignition switch in position II.

2
Measure the voltage between the:
  • Left-hand side heated seat C33-L pin 9, circuit B_CBR03A (GY), harness side and ground.
  • Right-hand side passenger heated seat C33-M pin 9, circuit B_CBR04A (VT), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit B_CBR03A (GY) or circuit B_CBR04A (VT). TEST the system for normal operation.
F3: CHECK CONTINUITY BETWEEN THE HEATED SEAT SWITCH AND HEATED SEAT
1
Ignition switch in position 0.
2
Disconnect Heated Seat Switch C3HS29.

3
Measure the resistance between the:
  • Left-hand side heated seat C33-L pin 17, circuit CHS32C (BN), harness side and the heated seat switch C3HS29 pin 2, circuit CHS32B (BN), harness side.
  • Right-hand side heated seat C33-M pin 17, circuit CHS32A (BN), harness side and the heated seat switch C3HS29 pin 2, circuit CHS32B (BN), harness side.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit CHS32A (BN), or circuit CHS32B (BN), or circuit CHS32C (BN). TEST the system for normal operation.
F4: CHECK THE INOPERATIVE HEATED SEAT MODULE GROUND CIRCUIT
1
Disconnect Inoperative Heated Seat Module.
2
Connect Inoperative Heated Seat C33-L or C33-M.

3
Measure the resistance between the:

    Left-hand seat

  • Heated seat module pin 2, circuit GD149R (BK/GY), harness side and ground.
  • Heated seat module pin 4, circuit GD149R (BK/GY), harness side and ground.

    Right-hand seat

  • Heated seat module pin 4, circuit GD151D (BK/GN), harness side and ground.

Are the resistances less than 5 ohms?
Yes
No
INSTALL a new seat wiring sub-harness. TEST the system for normal operation.
F5: CHECK FOR CONTINUITY BETWEEN THE HEATED SEAT SWITCH AND THE INOPERATIVE HEATED SEAT MODULE

1
Measure the resistance between the:
  • Left-hand side heated seat module pin 3, circuit CHS32A (BN), harness side and the heated seat switch C3HS29 pin 2, circuit CHS32B (BN), harness side.
  • Right-hand side heated seat module pin 3, circuit CHS32A (BN), harness side and the heated seat switch C3HS29 pin 2, circuit CHS32B (BN), harness side.

Is the resistance less than 5 ohms?
Yes
No
INSTALL a new seat wiring sub-harness. TEST the system for normal operation.
F6: CHECK FOR VOLTAGE TO THE INOPERATIVE HEATED SEAT MODULE
1
Ignition switch in position II.

2
Measure the voltage between the:
  • Left-hand side heated seat module pin 1, harness side and ground.
  • Right-hand side heated seat module pin 1, harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
INSTALL a new seat wiring sub-harness. TEST the system for normal operation.
F7: CHECK THE INOPERATIVE HEATED SEAT BACKREST HEATER MAT FOR CONTINUITY
1
Ignition switch in position 0.
2
Disconnect Inoperative Heated Seat Backrest.

3
Measure the resistance between the driver heated seat backrest pin 1 and pin 2, component side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new heated seat module and cushion heater mat.
REFER to: Front Seat Cushion (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
No
INSTALL a new heated seat backrest heater mat.
REFER to: Front Seat Backrest (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.

PINPOINT TEST G : ALL CLIMATE CONTROLLED SEATS ARE INOPERATIVE/DO NOT OPERATE CORRECTLY - FRONT SEAT

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
G1: CHECK FOR VOLTAGE TO THE CLIMATE CONTROLLED SEAT SWITCH
1
Ignition switch in position II.
2
Operate the climate controlled seat switch.

Do the climate controlled seat switch LEDs illuminate?
Yes
No
G2: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT
1
Ignition switch in position 0.
2
Disconnect Inoperative Climate Controlled Seat C33-L or C33-M.
3
Ignition switch in position II.
4
Operate the climate controlled seat switch.

5
Measure the voltage between the:
  • Left-hand side climate controlled seat C33-L pin 9, circuit B_CBR03A (GY) harness side and ground.
  • Right-hand side climate controlled seat C33-M pin 9, circuit B_CBR04A (VT) harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
G3: CHECK FOR CONTINUITY BETWEEN THE CLIMATE CONTROLLED SEAT SWITCH AND THE CLIMATE CONTROLLED SEAT
1
Ignition switch in position 0.
2
Disconnect Climate Controlled Seat Switch C3HS29.

3
Measure the resistance between the driver climate controlled seat C33-L pin 17, circuit CHS32C (BN), harness side and the climate controlled seat switch C3HS29 pin 2, circuit CHS32B (BN), harness side.

Is the resistance less than 5 ohms?
Yes
VERIFY the customer concern.
No
REPAIR circuit CHS32B (BN). TEST the system for normal operation.
G4: CHECK THE CLIMATE CONTROLLED SEAT SWITCH GROUND CIRCUIT
1
Ignition switch in position 0.

2
Measure the resistance between the climate controlled seat switch switch C3HS29 pin 1, circuit GD133AP (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit GD133AP (BK). TEST the system for normal operation.
G5: CHECK FOR VOLTAGE TO THE CLIMATE CONTROLLED SEAT SWITCH
1
Ignition switch in position II.

2
Measure the voltage between the:
  • Climate controlled seat switch C3HS29 pin 4, circuit CBP04F (VT), harness side and ground.
  • Climate controlled seat switch C3HS29 pin 6, circuit CBP17Y (BN/GN), harness side and ground.

Is the voltage greater than 10 volts?
Yes
INSTALL a new heated seat switch.
REFER to: Climate Controlled Seat Switch (501-10 Seating, Removal and Installation).
TEST the system for normal operation.
No
REPAIR circuit CBP04F (VT) or circuit CBP17Y (BN/GN). TEST the system for normal operation.
G6: CHECK THE CLIMATE SEAT RELAY GROUND CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Rear Junction Box Relay RB1.

3
Measure the resistance between the rear junction box relay RB1 pin 2, circuit CDC03A (BU), harness side and the CJB pin 45, circuit CDC03A (BU), harness side.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit 31-BB7A (BK). TEST the system for normal operation.
G7: CHECK FOR BATTERY VOLTAGE TO THE CLIMATE CONTROLLED SEAT SWITCH
1
Ignition switch in position II.

2
Measure the voltage between the:
  • Rear junction box relay RB1 pin 1, circuit SBR07D (GN/RD), harness side and ground.
  • Rear junction box relay RB1 pin 3, circuit SBB20P (GN/RD), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit SBR07D (GN/RD) or circuit SBB20P (GN/RD). TEST the system for normal operation.
G8: CHECK FOR CONTINUITY BETWEEN THE IGNITION RELAY AND CLIMATE CONTROLLED SEAT

1
Measure the resistance between the:
  • Rear junction box relay RB1 pin 5, circuit C4BR02 (GY), harness side and the heated seat C33-L pin 9, circuit B_CBR03A (GY), harness side.
  • Rear junction box relay RB1 pin 5, circuit C4BR02 (VT), harness side and the heated seat C33-M pin 9, circuit B_CBR04A (VT), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new rear junction box relay. TEST the system for normal operation.
No
REPAIR circuit B_CBR03A (GY) or circuit B_CBR04A (VT). TEST the system for normal operation.

PINPOINT TEST H : A SINGLE CLIMATE CONTROLLED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - FRONT SEAT

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
H1: CHECK THE CLIMATE CONTROLLED SEAT HEATER OPERATION
1
Ignition switch in position II.
2
Operate the climate controlled seat switch.

Do the climate controlled seat heater mats operate correctly?
Yes
No
H2: CHECK THE CLIMATE CONTROLLED SEAT FAN OPERATION
1
Operate the climate controlled seat switch.

Does the climate seat fans operate correctly?
Yes
VERIFY the customer concern.
No
H3: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT
1
Ignition switch in position 0.
2
Disconnect Inoperative Underseat Electrical Connector C33-L or C33-M.
3
Ignition switch in position II.
4
Operate the climate controlled seat switch.

5
Measure the voltage between the:
  • Left-hand side underseat connector C33-L pin 9, circuit B_CBR03A (GY), harness side and ground.
  • Right-hand side underseat connector C33-M pin 9, circuit B_CBR04A (VT), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit B_CBR03A (GY) or circuit B_CBR04A (VT). TEST the system for normal operation.
H4: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT HEATER MODULE
1
Ignition switch in position 0.
2
Connect Inoperative Seat Underseat Electrical Connector C33-L or C33-M.
3
Disconnect Inoperative Seat Heater Module.
4
Ignition switch in position II.
5
Operate the climate controlled seat switch.

6
Measure the voltage between the inoperative seat heater module electrical connector pin 1, (GN), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
INSTALL a new climate controlled seat wiring harness. TEST the system for normal operation.
H5: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT CONTROL MODULE
1
Ignition switch in position 0.
2
Disconnect Inoperative Seat Climate Controlled Seat Control Module.
3
Ignition switch in position II.
4
Operate the climate controlled seat switch.

5
Measure the voltage between the inoperative climate controlled seat control module pin 9, (GN), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
INSTALL a new climate controlled seat wiring harness. TEST the system for normal operation.
H6: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT BACKREST HEATER MAT
1
Ignition switch in position 0.
2
Connect Inoperative Seat Climate Seat Control Module.
3
Disconnect Inoperative Front Seat Backrest Heater Mat.
4
Ignition switch in position II.
5
Operate the climate controlled seat switch.

6
Measure the voltage between the front seat backrest heater mat connector pin 1, (RD/BK), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
INSTALL a new heated seat module and cushion heater mat.
REFER to: Front Seat Cushion (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
H7: CHECK THE INOPERATIVE CLIMATE CONTROLLED SEAT HEATED SEAT BACKREST HEATER MAT FOR CONTINUITY
1
Ignition switch in position 0.

2
Measure the resistance between the front seat backrest pin 1 (RD/BK) and pin 2 (BK), component side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new heated seat module and cushion heater mat.
REFER to: Front Seat Cushion (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
No
INSTALL a new front seat backrest heater mat.
REFER to: Front Seat Backrest (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
H8: CHECK THE CLIMATE CONTROLLED SEAT FAN OPERATION
1
Operate the climate controlled seat switch.

Does the climate controlled front seat backrest fans operate correctly?
Yes
No
H9: CHECK THE INOPERATIVE CLIMATE CONTROLLED SEAT FRONT SEAT CUSHION FAN GROUND CIRCUIT
1
Ignition switch in position 0.
2
Disconnect Inoperative Front Seat Cushion Fans.

3
Measure the resistance between the front seat cushion fan pin 2, (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
No
INSTALL a new climate controlled seat wiring harness. TEST the system for normal operation.
H10: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT FRONT SEAT CUSHION FANS
1
Ignition switch in position II.
2
Operate the climate controlled seat switch.

3
Measure the voltage between the front seat cushion fan pin 1, (RD), harness side and ground.

Is the voltage greater than 6 volts?
Yes
INSTALL new climate controlled front seat cushion fans. TEST the system for normal operation.
No
H11: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT HEATER MODULE
1
Ignition switch in position 0.
2
Disconnect Inoperative Front Seat Backrest Fans.

3
Measure the resistance between the front seat backrest fan pin 2, (BK), harness side and ground.

Is the resistance less than 5 ohms?
Yes
No
INSTALL a new climate controlled seat wiring harness. TEST the system for normal operation.
H12: CHECK FOR VOLTAGE TO THE INOPERATIVE CLIMATE CONTROLLED SEAT FRONT SEAT BACKREST FANS
1
Ignition switch in position II.
2
Operate the climate controlled seat switch.

3
Measure the voltage between the front seat backrest fans pin 1, (RD/BK), harness side and ground.

Is the voltage greater than 6 volts?
Yes
INSTALL new climate controlled front seat backrest fans.
REFER to: Front Seat Backrest (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
No
H13: CHECK FOR CONTINUITY BETWEEN THE INOPERATIVE CLIMATE CONTROLLED SEAT CUSHION FANS AND THE CLIMATE CONTROLLED SEAT MODULE
1
Ignition switch in position 0.
2
Disconnect Inoperative Front Seat Climate Controlled Seat Control Module.

3
Measure the resistance between the climate controlled seat control module pin 6, (RD), harness side and the front seat cushion fans pin 1, (RD), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new climate controlled seat control module.
REFER to: Front Seat Cushion (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
No
INSTALL a new climate controlled seat wiring harness. TEST the system for normal operation.
H14: CHECK FOR CONTINUITY BETWEEN THE INOPERATIVE CLIMATE CONTROLLED SEAT BACKREST FANS AND THE CLIMATE CONTROLLED SEAT MODULE
1
Ignition switch in position 0.
2
Disconnect Inoperative Front Seat Climate Controlled Seat Control Module.

3
Measure the resistance between the climate controlled seat control module pin 1, (BK/RD), harness side and the front seat backrest fans pin 1, (RD/BK), harness side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new climate controlled seat control module.
REFER to: Front Seat Cushion (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
No
INSTALL a new climate controlled seat wiring harness. TEST the system for normal operation.

PINPOINT TEST I : THE HEATED SEAT IS INOPERATIVE - REAR SEAT

NOTE:
NOTE:Use a digital multimeter for all electrical measurements.
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
I1: CHECK THE INOPERATIVE HEATED SEAT GROUND CIRCUIT
1
Disconnect Inoperative Heated Rear Seat C4HS39A or C4HS43A.
2
Disconnect Inoperative Heated Seat Backrest.

3
Measure the resistance between the:
  • Left-hand heated rear seat module C4HS39A pin 4, circuit GD134V (BK/VT), harness side and ground.
  • Right-hand heated rear seat module C4HS43A pin 4, circuit GD140L (BK/GN), harness side and ground.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit GD134V (BK/VT) or circuit GD140L (BK/GN). TEST the system for normal operation.
I2: CHECK FOR VOLTAGE TO THE INOPERATIVE HEATED SEAT
1
Ignition switch in position II.
2
Disconnect Inoperative Heated Seat Backrest.

3
Measure the voltage between the:
  • Left-hand heated rear seat module C4HS39A pin 1, circuit B_CBR05A (YE), harness side and ground.
  • Right-hand heated rear seat module C4HS43A pin 1, circuit B_CBR07A (GN/BU), harness side and ground.

Is the voltage greater than 10 volts?
Yes
No
REPAIR circuit B_CBR05A (YE), or circuit B_CBR07A (GN/BU). TEST the system for normal operation.
I3: CHECK FOR CONTINUITY BETWEEN THE HEATED SEAT CONTROL SWITCH AND THE INOPERATIVE HEATED SEAT
1
Ignition switch in position 0.
2
Disconnect Inoperative Heated Seat Backrest.
3
Disconnect Heated Seat Control Switch.

4
Measure the resistance between the:
  • Heated seat control switch C4HS29 pin 2, circuit CHS31A (YE/OG) harness side and the left-hand heated seat pin 3, C4HS39 circuit CHS31C (YE/OG), harness side.
  • Heated seat control switch C4HS29 pin 2, circuit CHS31A (YE/OG) harness side and the right-hand heated seat pin 3, C4HS43 circuit CHS31D (YE/OG), harness side.

Is the resistance less than 5 ohms?
Yes
No
REPAIR circuit CHS31A (YE/OG) or circuit CHS31C (YE/OG) or circuit CHS31D (YE/OG). TEST the system for normal operation.
I4: CHECK THE INOPERATIVE HEATED SEAT BACKREST FOR CONTINUITY
1
Disconnect Inoperative Heated Seat Backrest.

2
Measure the resistance between the:
  • Left-hand heated seat backrest C4HS39_B pin 1, circuit CHS40A (GY/VT), component side and pin 2, circuit CHS39A (GN/BU), component side.
  • Right-hand heated seat backrest C4HS43_B pin 1, circuit CHS44A (GN/VT), component side and pin 2, circuit CHS43A (GY/BU), component side.

Is the resistance less than 5 ohms?
Yes
INSTALL a new heated seat module and cushion heater mat.
REFER to: Rear Seat Cushion (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.
No
INSTALL a new heated seat backrest heater mat.
REFER to: Rear Seat Backrest (501-10 Seating, Disassembly and Assembly).
TEST the system for normal operation.

Mechanical Repairs > 5 Body and Paint > 501 Body and Paint > 501-10 Seating > Description and Operation > Diagnosis and Testing > Seats

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