Initial Inspection and Diagnostic Overview
INSPECTION AND VERIFICATION1. Verify the customer s concern by operating the power seat(s) to duplicate the condition.
2. 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 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 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 is operating acceptably. Reconnect the power seat system and continue with the diagnostic procedure.
Visual Inspection Chart:
3. Inspect to determine if one of the mechanical or electrical concerns apply.
4. If the inspection reveals obvious concern(s) that can be readily identified, repair as required.
5. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not power up:
- check that the program card is correctly inserted
- check the connections to the vehicle
- check the ignition switch position
If the scan tool still does not power up, refer to the scan tool manual.
6. Carry out the Data Link Diagnostic Test using the scan tool. If the scan tool responds with:
- CKT 914 or CKT 915 = ALL MODULE NO RESP/NOT EQUIP, go to Communication System Diagnostics in Information Bus (Module Communications Network) to diagnose the network concern.
- NO RESP/NOT EQUIP for the Driver Seat Module (DSM). GO to Pinpoint Test B. Test B
- NO RESP/NOT EQUIP for the Driver Door Module (DDM). GO to Pinpoint Test A. Test A
- If the DSM is not listed for a communication concern, turn the ignition switch to RUN, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, then execute the Self-Test diagnostics for the DSM. If the DSM exits the diagnostic state during the self-test and returns to a normal operating state, GO to Pinpoint Test B. Test B
- If the DDM is not listed for a communication concern, turn the ignition switch to RUN, make sure all doors are closed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, then execute the Self-Test diagnostics for the DDM. If the DDM exits diagnostic state during the self-test and returns to normal operating state. GO to Pinpoint Test A. Test A
7. If the DSM DTCs retrieved are related to the concern, go to the Driver Seat Module (DSM) Diagnostic Trouble Code (DTC) Index to continue the diagnostics. Diagnostic Trouble Code Descriptions
8. If the DDM DTCs retrieved are related to the concern, go to the Driver Door Module (DDM) Diagnostic Trouble Code (DTC) Index to continue the diagnostics. Diagnostic Trouble Code Descriptions
9. If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures