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 fuses located in the Power Distribution Center (PDC). The fuses must be OK and tight in the receptacles.
- Using a scan tool, check for any Diagnostic Trouble Codes (DTCs) related to the Heated Seat Module (HSM) and A/C-heater control. If any DTCs are found, repair as necessary. Refer to DIAGNOSIS AND TESTING for further diagnostic information.
- 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.
- If there are no DTCs and the front heated seat system functions properly, but one or both of the Light Emitting Diode (LED) indicators in a front heated seat switch do not illuminate, replace the A/C-heater control. Refer to CONTROL, A/C AND HEATER, REMOVAL .
- If there are no DTCs and the rear heated seat system functions properly, but one or both of the LED indicators in a rear heated seat switch do not illuminate, check the rear heated switch circuits and repair as necessary. See SYSTEM WIRING DIAGRAMS . If the wiring is OK, replace the inoperative second row heated seat switch. Refer to SWITCH, HEATED SEAT, REMOVAL .
Auto-On Inoperative
- If the Auto-On system is not functioning for the vehicle, check the following:
- Verify the heated seat system is operational.
- Verify the customer programmable feature is enabled in the radio.
- Verify that the vehicles reads ambient temperature at or below 4° C (40° F)
- Using a scan tool, check for DTCs.
- Check for software updates on the U-Connect™ website.