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 SYSTEM WIRING DIAGRAMS . Wiring Information includes wiring diagrams, connector pin-out and location views, details of wire harness routing and retention, splice and ground locations and proper wire and connector repair procedures.
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 defective or weak it may not be suppling 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 DIAGNOSIS AND TESTING .
- If there are no DTCs and a front heated seat does not operate properly, verify heated seat relay operation, and repair as necessary. Refer to DESCRIPTION .
- 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. Refer to DIAGNOSIS AND TESTING .
- If there are no DTCs and the front heated seat system functions properly, but the Light Emitting Diode (LED) indicator in a heated seat switch does not illuminate, replace the accessory switch pod located in the A/C heater control panel. Refer to POD, SWITCH, REMOVAL .