Heated Seat Inoperative - Rear

Heated Seat Inoperative - Rear

Diagnostic Instructions

- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure Initial Inspection and Diagnostic Overview.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach Initial Inspection and Diagnostic Overview.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category Initial Inspection and Diagnostic Overview.

Circuit/System Description

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.

Reference Information

Schematic Reference

Heated/Cooled Seat Connector End Views Connector Views

Connector End View Reference

Heated/Cooled Seat Connector End Views Connector Views

Electrical Information Reference

- Circuit Testing Component Tests and General Diagnostics
- Connector Repairs Component Tests and General Diagnostics
- Testing for Intermittent Conditions and Poor Connections Component Tests and General Diagnostics
- Wiring Repairs Component Tests and General Diagnostics

Scan Tool Reference

- Scan Tool Data List Scan Tool Testing and Procedures
- Scan Tool Data Definitions Scan Tool Testing and Procedures

Circuit/System Verification

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.

Repair Instructions

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 Control Module References