Diagnosis And Testing - Heated Seat System
Vehicles equipped with the heated seat option utilize a voltage cut-off feature. This feature turns off power to the heated seat system anytime vehicle voltage is below 9.0 volts or above 16.0 volts. Be certain to check the vehicle electrical system for proper voltage anytime the heated seat system appears inoperative.
If a Diagnostic Trouble Code (DTC) can not be verified, it is a good indication that an intermittent fault condition may be present. To help find an intermittent problem, sit in the seat in question and move around the heating elements within the seat while testing continuity. Wiggle the heated seat wire harness and electrical connectors while testing continuity.
For a complete wiring diagram, refer to the Wiring Information. Wiring Information includes wiring diagrams, connector pin-out and location views, splice and ground locations.
Before testing any individual components in the heated seat system, check the following:
- Check if the concern is isolated to only one seat. Operate the other heated seat.
- Check the fuse in the Power Distribution Center (PDC) and for power at the Comfort Seat and Wheel Module (CSWM). Repair as necessary.
- Using a scan tool, check for any Diagnostic Trouble Codes (DTCs) related to the CSWM and/or the Radio. If any DTCs are found, repair as necessary DTC INDEX .
- Check the vehicles battery open-circuit voltage and charging system performance. If the vehicle's electrical system is weak it may not be suppling sufficient energy to operate the heated seat system.
Auto-On Inoperative
- If the Auto-On system is not functioning for the vehicle, check the following:
- Verify that this vehicle is equipped with this feature.
- Verify the vehicle is reading ambient temperatures at or below 4° C (40° F).
- Verify the heated seat system is operational.
- Verify the customer programmable feature is enabled in the radio.
- Using a scan tool, check for DTCs.
- Check for software updates on the U-Connect™ website.