Diagnosis And Testing - Heated Seat Module

Refer to the appropriate wiring information in SYSTEM WIRING DIAGRAMS article. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

1. If a heated seat fails to heat and one or both of the LED indicator lamps on a heated seat switch flash, refer to POWER & HEATED SEATS article.
2. Test the appropriate Heated Seat Switch, refer to POWER & HEATED SEATS article.
3. Test the Heated Seat Sensor, refer to POWER & HEATED SEATS article.
4. Test the Heated Seat Element, refer to POWER & HEATED SEATS article.
5. Disconnect the heated seat module connector receptacle. Using an ohmmeter, check for continuity between the ground circuit  cavity and a good ground. If OK, go to Step 6. If not OK, repair the open ground circuit to ground as required.
6. Disconnect the heated seat module connector receptacle. Using an voltmeter, check for voltage on the B+ circuit  cavity. If OK, go to Step 7. If not OK, repair the open B+ circuit as required.
7. Replace the heated seat module with a known good module. Test operation of the heated seat system. If system works, OK repair complete. If system is still inoperative a short or open exists in the heated seat system wiring. Using Wiring Diagrams as a guide, check the individual circuits until the short or open is found.