Diagnosis And Testing - Heated Seat System
Vehicles equipped with the heated seat option utilize a low voltage cut-off feature. This feature turns off power to the heated seat system anytime vehicle voltage is below 11.7 volts or above 15.5 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 complete circuit diagrams, see appropriate Wiring Information. The wiring information includes wiring diagrams, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. For proper wire repair, and connector repair procedures. Refer to STANDARD PROCEDURE , REMOVAL and INSTALLATION .
Before testing any individual components in the heated seat system, check the following:
- Check the vehicles battery open-circuit voltage and charging system performance. If the vehicle's electrical system is ineffective or weak it may not be supplying sufficient energy to operate the heated seat system.
- Using a scan tool, check for any Diagnostic Trouble Codes (DTCs) related to the Body Control Module (BCM) and the heated seat switches. If any DTCs are found, repair as necessary. Refer to DTC INDEX .
- If there are no DTCs and a front heated seat does not operate properly, verify heated seat relay operation, and repair as necessary.
- If there are no DTCs and the front seat heating elements are receiving battery power and have a good ground, test the seat heating elements for proper operation, and repair as necessary.