The left and right rear passenger heated seats are controlled by separate heated seat switches located in the auxiliary heater and air conditioning control module. The heated seats operate in the high and low modes for the seat cushion only. When a heated seat switch is pressed, the auxiliary heater and air conditioning control module illuminates appropriate switch indicators and sends a serial data message to the rear heated seat module (RHSM) indicating the heated seat request. The RHSM then determines the mode of operation and turns the heated seat system ON or OFF.

Schematic Reference

Heated/Cooled Seat Connector End Views

Connector End View Reference

Heated/Cooled Seat Connector End Views

Electrical Information Reference

Scan Tool Reference

1. Engine running, observe the scan tool Rear HVAC/RSA parameters listed below while pressing and releasing the appropriate heated seat switch. The reading should change between Inactive and Active and the appropriate switch indicators should illuminate.

•	Left Rear Heated Seat Switch

•	Right Rear Heated Seat Switch

⇒	If not the specified values, replace the auxiliary heater and air conditioning control module.

⇒	If the scan tool parameters test normal, but, the switch indicators do not illuminate, replace the auxiliary heater and air conditioning control module.

2. If all scan tool parameters test normal and there are no DTCs set, replace the RHSM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for RHSM and auxiliary heater and air conditioning control module replacement, setup, and programming