:  Dec 17, 2007



Overview

The diagnosis of the seats can be separated into three main areas, seat movement, memory and seat heating.

Seat heating is controlled by the automatic temperature control module, so there will be some cross-over with the climate control section as far as diagnostic trouble codes (DTCs) are concerned.

There are a number of linked systems, such as the mirror and steering column movement which will also be covered in this section.

For information on the description and operation of the systems, refer to the relevant section of the workshop manual.

Inspection and Verification

. Verify the customer concern.

. Visually inspect for obvious mechanical or electrical faults.
  It is not unusual for foreign objects to find their way into the runners and frames of the seats.
It is not unusual for foreign objects to find their way into the runners and frames of the seats.

Mechanical Electrical
  • Seat runners
  • Seat frames
  • Seat movement switch condition and installation
  • Seat heater switch condition and installation
  • Seat motor(s) condition and installation
  • Steering column switch condition and installation
  • Steering column condition and installation
  • Door mirror switch condition and installation
  • Door mirror condition and installation
  • Battery condition and state of charge
  • Fuses
  • Harnesses and connectors
  • Seat movement switch(es)
  • Seat heater switch(es)
  • Seat heater elements
  • Seat motor(s)
  • Seat module(s)
  • Memory control module(s)
  • Steering column switch
  • Steering column motor
  • Door mirror switch(es)
  • Door mirror motor(s)
  • Ignition switch
  • Battery junction box (BJB)
  • Central junction box (CJB)
  • Local interconnect network (LIN) circuit

. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

. Use the approved diagnostic system or a scan tool to retrieve any DTCs before moving onto the symptom chart or DTC index.
  Because the DTCs are stored in more than one module, a complete vehicle read is recommended.
Because the DTCs are stored in more than one module, a complete vehicle read is recommended.
  Make sure that all DTCs are cleared following rectification.
Make sure that all DTCs are cleared following rectification.

Symptom chart

:
  References to seat movement refer to either front seat.

Symptom Possible causes Action
Seat does not move when the switch is operated (forward, backward, tilt, etc)
  • Runner or mechanism jammed
  • Switch fault
  • Motor fault
  • Thermal cut-out engaged
  • Circuit fault
  • Module fault
Check for obstructions at the seat runners, mechanisms, etc, rectify as necessary. The thermal cut-out may engage if there is a motor or mechanism fault. Check for DTCs indicating a switch, motor or module fault.
Steering column does not move when the switch is operated
  • Switch fault
  • Motor fault
  • Clutch/Solenoid fault
Check for DTCs indicating a switch, motor or clutch/solenoid fault.
Mirrors do not move when the switch is operated
  • Mechanical fault
  • Switch fault
  • Motor fault
  • Circuit fault: high resistance
  • Circuit fault: short circuit to ground
For mirror tests, refer to the relevant section of the workshop manual.
Memorized seat/steering column/mirror position is not resumed
  • Battery voltage below 10.5 volts
  • Position not stored
  • Switch operated during "one-touch" memory recall
  • EEPROM fault
Before condemning a memory component, check the function from the switch and refer to the symptoms above. Make sure the battery voltage is adequate. Make sure that the desired position is correctly stored. Make sure that the memory store/recall procedure is being followed. Refer to the relevant section of the workshop manual.
"Lazy entry" function inoperative
  • Remote transmitter fault (battery, transmitter programming, etc)
  • See list for "position is not resumed"
Check that the remote transmitter operates the central locking, etc. If it does, the fault is not with the transmitter. Refer to "position is not resumed".
Entry/Exit mode inoperative
  • Switch not in AUTO mode
  • Switch fault
  • Motor fault
  • Clutch/Solenoid fault
Make sure the function is enabled and that the switch is correctly set. Check for DTCs indicating a switch, motor or clutch/solenoid fault.
Seat does not get warm
  • Switch fault
  • Fuses
  • Circuit fault
  • Temperature sensor
  • Battery voltage is greater than 16.5 volts
Check the LEDs at the switches as a quick check of the switch function. If the LEDs illuminate when the switches are operated, there is power to the switches and the switches are operating at least one level. Check the seat heater circuits, refer to the electrical guides. Check the temperature sensor function. If the battery voltage is higher than 16.5 volts for more than 5 seconds, seat heating is suspended. Refer to the relevant section of the workshop manual.
Part(s) of the seat do not get warm
  • Element fault
There are up to three elements in each seat, if the rest of the seat operates normally, check the element connections and continuity. Refer to the electrical guides.

DTC index

:
  Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).

:
  For a full list of seat heating function DTCs, refer to section 412-00 - Climate Control in the workshop manual. For additional DTCs, refer to section 418-00 - Network Communications in the workshop manual.

DTC Description Possible causes Action
B1A7318 Left Hand Seat Heater
  • Left-hand seat heater power supply high resistance
  • Left-hand seat heater power supply short circuit to ground
Check the left-hand seat heater switch and circuit. Refer to the electrical guides.
B1A7418 Right Hand Seat Heater
  • Right-hand seat heater power supply current below threshold
Check the right-hand seat heater switch and circuit. Refer to the electrical guides.
B1B6511 Left Hand Seat Heater Temperature Sensor
  • Left-hand seat heater temperature signal short circuit to ground
Check the seat heater temperature signal circuit. Refer to the electrical guides. Refer to the relevant section of the workshop manual.
B1B6515 Left Hand Seat Heater Temperature Sensor
  • Left-hand seat heater temperature signal high resistance
  • Left-hand seat heater temperature signal short circuit to power
Check the seat heater temperature signal circuit. Refer to the electrical guides. Refer to the relevant section of the workshop manual.
B1B6611 Right Hand Seat Heater Temperature Sensor
  • Right-hand seat heater temperature signal short circuit to ground
Check the seat heater temperature signal circuit. Refer to the electrical guides. Refer to the relevant section of the workshop manual.
B1B6615 Right Hand Seat Heater Temperature Sensor
  • Right-hand seat heater temperature signal high resistance
  • Right-hand seat heater temperature signal short circuit to power
  • Right-hand seat heater power supply high resistance
  • Right-hand seat heater power supply short circuit to ground
Check the seat heater temperature signal circuit. Refer to the electrical guides. Refer to the relevant section of the workshop manual.
B1B8541 Memory Control Module
  • Seat module error
Renew the seat memory control module. Refer to the warranty policy and procedures manual if a module is suspect.
B1B8549 Memory Control Module
  • Seat module error
If no customer complaint issue exists with seat operation, no action necessary, clear/ignore DTC. If seat functionality is affected, renew module. Refer to the warranty policy and procedures manual if a module is suspect.
B1B8587 Memory Control Module
  • No response from seat memory control module
Seat memory is not installed to all variants (optional). Fault logging is inhibited by the CCF, but an incorrectly configured CCF could give erroneous DTC logging. Repair action only required for vehicles with sunroof installed. Where necessary refer to the lost communication statement at the start of this table.
B1B8673 Seat Height Motor Relay
  • Memory control module internal relay fault (stuck on)
Renew the seat memory control module. Refer to the warranty policy and procedures manual if a module is suspect.
B1B8693 Seat Height Motor Relay
  • Software error
  • Memory control module internal relay fault (inoperative)
If no customer complaint issue exists with seat operation, no action necessary, clear/ignore DTC. If seat functionality is incorrect check/renew the control module as necessary. Refer to the warranty policy and procedures manual if a module is suspect.
B1B8731 Seat Height Motor Speed/Position Sensor
  • Wiring circuit/connector issue
  • Seat height motor speed/position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the seat height motor. Repair/renew as necessary. If no circuit fault is found check/renew the seat height motor.
B1B873A Seat Height Motor Speed/Position Sensor
  • Seat height moved beyond expected range Sensor circuit open or short circuit Seat adjustment range issue Seat height motor speed/position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the seat height motor. Repair/renew as necessary. Check the seat adjustment ranges to ensure correct operation. Renew the seat height motor.
B1B8873 Seat Height Motor Relay
  • Memory control module internal relay fault (stuck on)
Renew the seat memory control module. Refer to the warranty policy and procedures manual if a module is suspect.
B1B8893 Seat Slide Motor Relay
  • Software error
  • Memory control module internal relay fault (inoperative)
If no customer complaint issue exists with seat operation, no action necessary, clear/ignore DTC. If seat functionality is incorrect check/renew the control module as necessary.
B1B8931 Seat Slide Motor Speed/Position Sensor
  • Wiring circuit/connector issue
  • Seat slide motor speed/position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the seat slide motor. Repair/renew as necessary. If no circuit fault is found check/renew the seat slide motor.
B1B893A Seat Slide Motor Speed/Position Sensor
  • Seat slide moved beyond expected range Sensor circuit open or short circuit Seat adjustment range issue Seat slide motor speed/position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the seat slide motor. Repair/renew as necessary. Check the seat adjustment ranges to ensure correct operation. Renew the seat slide motor.
B1B9073 Seat Tilt Motor Relay
  • Memory control module internal relay fault (stuck on)
Renew the seat memory control module. Refer to the warranty policy and procedures manual if a module is suspect.
B1B9093 Seat Tilt Motor Relay
  • Software error
  • Memory control module internal relay fault (inoperative)
If no customer complaint issue exists with seat operation, no action necessary, clear/ignore DTC. If seat functionality is incorrect check/renew the control module as necessary.
B1B9131 Seat Tilt Motor Speed/Position Sensor
  • Wiring circuit/connector issue
  • Seat tilt motor speed/position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the seat tilt motor. Repair/renew as necessary. If no circuit fault is found check/renew the seat tilt motor.
B1B913A Seat Tilt Motor Speed/Position Sensor
  • Seat tilt moved beyond expected range Sensor circuit open or short circuit Seat adjustment range issue Seat tilt motor speed/position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the seat tilt motor. Repair/renew as necessary. Check the seat adjustment ranges to ensure correct operation. Renew the seat tilt motor.
B1B9273 Seat Recline Motor Relay
  • Memory control module internal relay fault (stuck on)
Renew the seat memory control module. Refer to the warranty policy and procedures manual if a module is suspect.
B1B9293 Seat Recline Motor Relay
  • Software error
  • Memory control module internal relay fault (inoperative)
If no customer complaint issue exists with seat operation, no action necessary, clear/ignore DTC. If seat functionality is incorrect check/renew the control module as necessary.
B1B9331 Seat Recline Motor Speed/Position Sensor
  • Wiring circuit/connector issue
  • Seat recline motor speed/position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the seat recline motor. Repair/renew as necessary. If no circuit fault is found check/renew the seat recline motor.
B1B933A Seat Recline Motor Speed/Position Sensor
  • Seat recline moved beyond expected range Sensor circuit open or short circuit Seat adjustment range issue Seat recline motor speed/position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the seat recline motor. Repair/renew as necessary. Check the seat adjustment ranges to ensure correct operation. Renew the seat recline motor.
B1B9473 Seat Height Up Switch
  • Seat height up switch stuck
  • Seat height up switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1B9573 Seat Height Down Switch
  • Seat height down switch stuck
  • Seat height down switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1B9673 Seat Slide Forward Switch
  • Seat slide forward switch stuck
  • Seat slide forward switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1B9773 Seat Slide Backward Switch
  • Seat slide backward switch stuck
  • Seat slide backward switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1B9873 Seat Tilt Up Switch
  • Seat tilt up switch stuck
  • Seat tilt up switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1B9973 Seat Tilt Down Switch
  • Seat tilt down switch stuck
  • Seat tilt down switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1C0073 Seat Recline Up Switch
  • Seat recline up switch stuck
  • Seat recline up switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1C0173 Seat Recline Down Switch
  • Seat recline down switch stuck
  • Seat recline down switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1C0273 Memory Store Switch
  • Seat memory store switch stuck
  • Seat memory store switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1C0373 Memory #1 Switch
  • Seat memory #1 switch stuck
  • Seat memory #1 switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1C0473 Memory #2 Switch
  • Seat memory #2 switch stuck
  • Seat memory #2 switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1C0573 Memory #3 Switch
  • Seat memory #3 switch stuck
  • Seat memory #3 switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the seat switch pack for short to ground. Check the switch operation, renew as necessary.
B1C0601 Driver Up/Down And Common Mirror Motor Circuit
  • Mirror motor up/down circuit open or short circuit
  • Mirror up/down motor failure
Refer to the electrical guides and check the circuit between the memory control module and the door mirror for open circuit or short to ground. Check the mirror operation, renew as necessary.
B1C0701 Driver Left/Right and Right-hand Up/Down Mirror Motor Circuit
  • Mirror motor left/right circuit open or short circuit
  • Mirror left/right motor failure
Refer to the electrical guides and check the circuit between the memory control module and the door mirror for open circuit or short to ground. Check the mirror operation, renew as necessary.
B1C0801 Passenger Left/Right And Common Mirror Motor Circuit
  • Mirror motor left/right circuit open or short circuit
  • Mirror left/right motor failure
Refer to the electrical guides and check the circuit between the memory control module and the door mirror for open circuit or short to ground. Check the mirror operation, renew as necessary.
B1C0973 Driver Left/Right Mirror Motor Circuit
  • Software error (DTC can be logged when the mirror is moved manually)
  • Mirror motor left/right circuit open or short circuit
  • Mirror left/right motor failure
If no customer complaint issue exists with mirror operation, no action necessary, clear/ignore DTC. If mirror functionality is incorrect, refer to the electrical guides and check the circuit for open of short to ground. Renew the mirror motor/mirror as necessary.
B1C1073 Driver Up/Down Mirror Motor Circuit
  • Software error (DTC can be logged when the mirror is moved manually)
  • Mirror motor up/down circuit open or short circuit
  • Mirror up/down motor failure
If no customer complaint issue exists with mirror operation, no action necessary, clear/ignore DTC. If mirror functionality is incorrect, refer to the electrical guides and check the circuit for open of short to ground. Renew the mirror motor/mirror as necessary.
B1C1173 Passenger Left/Right Mirror Motor Circuit
  • Software error (DTC can be logged when the mirror is moved manually)
  • Mirror motor left/right circuit open or short circuit
  • Mirror left/right motor failure
If no customer complaint issue exists with mirror operation, no action necessary, clear/ignore DTC. If mirror functionality is incorrect, refer to the electrical guides and check the circuit for open of short to ground. Renew the mirror motor/mirror as necessary.
B1C1273 Passenger Up/Down Mirror Motor Circuit
  • Software error (DTC can be logged when the mirror is moved manually)
  • Mirror motor up/down circuit open or short circuit
  • Mirror up/down motor failure
If no customer complaint issue exists with mirror operation, no action necessary, clear/ignore DTC. If mirror functionality is incorrect, refer to the electrical guides and check the circuit for open of short to ground. Renew the mirror motor/mirror as necessary.
B1C133A Driver Up/Down Mirror Motor Feedback Circuit
  • Door mirror motor moved beyond expected range Sensor circuit open or short circuit Door mirror motor position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the mirror. Repair/renew as necessary. Check/renew the mirror motor/assembly.
B1C143A Driver Left/Right Mirror Motor Feedback Circuit
  • Door mirror motor moved beyond expected range Sensor circuit open or short circuit Door mirror motor position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the mirror. Repair/renew as necessary. Check/renew the mirror motor/assembly.
B1C153A Passenger Up/Down Mirror Motor Feedback Circuit
  • Door mirror motor moved beyond expected range Sensor circuit open or short circuit Door mirror motor position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the mirror. Repair/renew as necessary. Check/renew the mirror motor/assembly.
B1C163A Passenger Left/Right Mirror Motor Feedback Circuit
  • Door mirror motor moved beyond expected range Sensor circuit open or short circuit Door mirror motor position sensor fault
Refer to the electrical guides and check the harness and connections between the seat memory module and the mirror. Repair/renew as necessary. Check/renew the mirror motor/assembly.
B1C1773 Driver Mirror Left Switch
  • Mirror left switch stuck
  • Mirror left switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the mirror switch pack for short to ground. Check the switch operation, renew as necessary.
B1C1873 Driver Mirror Right Switch
  • Mirror right switch stuck
  • Mirror right switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the mirror switch pack for short to ground. Check the switch operation, renew as necessary.
B1C1973 Driver Mirror Up Switch
  • Mirror up switch stuck
  • Mirror up switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the mirror switch pack for short to ground. Check the switch operation, renew as necessary.
B1C2073 Driver Mirror Down Switch
  • Mirror down switch stuck
  • Mirror down switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the mirror switch pack for short to ground. Check the switch operation, renew as necessary.
B1C2173 Passenger Mirror Left Switch
  • Mirror left switch stuck
  • Mirror left switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the mirror switch pack for short to ground. Check the switch operation, renew as necessary.
B1C2273 Passenger Mirror Right Switch
  • Mirror right switch stuck
  • Mirror right switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the mirror switch pack for short to ground. Check the switch operation, renew as necessary.
B1C2373 Passenger Mirror Up Switch
  • Mirror up switch stuck
  • Mirror up switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the mirror switch pack for short to ground. Check the switch operation, renew as necessary.
B1C2473 Passenger Mirror Down Switch
  • Mirror down switch stuck
  • Mirror down switch circuit short to ground
Refer to the electrical guides and check the wiring between the memory control module and the mirror switch pack for short to ground. Check the switch operation, renew as necessary.
B1C3173 Steering Column Motor Relay
  • Software error (electric column not installed)
  • Steering column motor relay fault (stuck on)
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, refer to the electrical guides and check the column motor circuit for short or open circuit and check/renew the memory control module as necessary.
B1C3193 Steering Column Motor Relay
  • Software error (electric column not installed)
  • Memory control module internal relay fault (inoperative)
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, check/renew the control module as necessary.
B1C3213 Steering Column Tilt Solenoid
  • Software error (electric column not installed)
  • Steering column motor tilt solenoid open load
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, refer to the electrical guides and check the column tilt solenoid circuit for short or open circuit and check/renew the tilt solenoid as necessary.
B1C3296 Steering Column Tilt Solenoid
  • Software error (electric column not installed)
  • Steering column motor tilt solenoid thermal overload
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, refer to the electrical guides and check the column tilt solenoid circuit for short or open circuit. Check for other relevant DTCs and repair as necessary. Allow the solenoid to cool, clear the DTC and check the solenoid/tilt function operation. If the DTC persists renew the tilt solenoid as necessary.
B1C333A Steering Column Tilt Feedback Signal
  • Software error (electric column not installed)
  • Steering column tilt motor moved beyond expected range Sensor circuit open or short circuit Motor position sensor fault
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, refer to the electrical guides and check the column tilt solenoid feedback circuit for short or open circuit. Check the solenoid/tilt function operation and range of movement. Renew the tilt solenoid as necessary.
B1C3413 Steering Column Telescopic Solenoid
  • Software error (electric column not installed)
  • Steering column motor telescopic solenoid open load
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, refer to the electrical guides and check the column telescopic solenoid circuit for short or open circuit and check/renew the tilt solenoid as necessary.
B1C3496 Steering Column Telescopic Solenoid
  • Software error (electric column not installed)
  • Steering column motor telescopic solenoid thermal overload
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, refer to the electrical guides and check the column telescopic solenoid circuit for short or open circuit. Check for other relevant DTCs and repair as necessary. Allow the solenoid to cool, clear the DTC and check the solenoid/telescopic function operation. If the DTC persists renew the telescopic solenoid as necessary.
B1C353A Steering Column Telescopic Feedback Signal
  • Software error (electric column not installed)
  • Steering column telescopic motor moved beyond expected range Sensor circuit open or short circuit Motor position sensor fault
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, refer to the electrical guides and check the column telescopic solenoid feedback circuit for short or open circuit. Check the solenoid/telescopic function operation and range of movement. Renew the telescopic solenoid as necessary.
B1C363A Steering Column Tilt/Telescope Switch
  • Software error (electric column not installed)
  • Steering column tilt/telescopic switch voltage beyond expected range Sensor circuit open or short circuit Switch fault
Where an electric column adjustment is not installed, no action necessary, clear/ignore DTC. Where an electric column adjustment is installed, refer to the electrical guides and check the column tilt/telescopic switch circuit for short or open circuit. Check the tilt/telescopic switch operation and renew the switch as necessary.