Heated Seat Inoperative - Rear

Heated Seat Inoperative - Rear

Diagnostic Instructions

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

Circuit/System Description

The left and right rear passenger heated seats are controlled by separate heated seat switches located in the rear seat audio (RSA) control. The heated seats operate in the high and low modes for the seat cushion only. When a heated seat switch is pressed, the RSA 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 Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Heated Seats Description and Operation (KA1) (Heated Seats Description and Operation (KA1))Heated Seats Description and Operation (KA6) (Heated Seats Description and Operation (KA6))
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

Control Module References (Programming and Relearning) for scan tool information

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 RSA.
• If the scan tool parameters test normal, but, the switch indicators do not illuminate, replace the RSA.

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

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Rear Seat Audio Control Replacement (Rear Seat Audio Control Replacement)
* Control Module References (Programming and Relearning) for RHSM replacement, setup, and programming