Inspection and Verification
Seats
Inspection and Verification
1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical and electrical damage.
Visual Inspection Chart:
3. 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 DSM C341b and driver seat motor C353.
2. Connect a fused jumper lead between DSM C341b-1, circuit 57 (BK), harness side and driver seat motor C353-1, circuit 981 (RD/WH), component side.
3. 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), component 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-1, circuit 57 (BK), harness side and driver seat motor C353-4, circuit 980 (YE/WH), component side.
5. 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), component 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 Seat Track Motor.
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.
4. If the concern is with the power seat (non-memory seat) or heated seat and the cause is not visually evident, verify the symptom and GO to Symptom Chart. Symptom Related Diagnostic Procedures
5. 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).
6. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms voltage 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 Information Bus, No Power To The Scan Tool, to diagnose no power to the scan tool.
7. 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 Information Bus to diagnose no response from the PCM.
8. Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to Information Bus.
- If the network test passes, retrieve and record on-demand and continuous memory DTCs.
9. Clear the continuous DTCs and carry out the self-test diagnostics for the DSM and DDM.
10. If the DTCs retrieved are related to the concern, go to Driver Seat Module (DSM) DTC Chart or Driver Door Module (DDM) DTC Chart.
11. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures