Impala V6-3.9L (2007)
Seat Heater: Symptom Related Diagnostic Procedures
A Symptoms - Seat Heating and Cooling
Symptoms - Seat Heating and Cooling
Important: The following steps must be completed before using the symptom tables.
1. When diagnosing a heated seat system condition perform the Diagnostic System Check - Vehicle, before using the symptom tables in order to
verify that all of the following are true:
* There are no DTCs set.
* The control module(s) can communicate via the serial data link. See: Testing and Inspection/Initial Inspection and Diagnostic
Overview/Diagnostic Starting Point - Vehicle
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Heated Seats Description and Operation.
Visual/Physical Inspection
* Inspect for aftermarket devices which could affect the operation of the power seats.
* Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
* Inspect the seat adjuster track for conditions which may cause binding or objects within the seat adjustment range which obstruct movement or
interfere with wiring.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.
See: Testing and Inspection/Component Tests and General Diagnostics
Symptom List
Refer to the Heated Seat Inoperative diagnostic procedure in order to diagnose the symptom.
Heated Seat Inoperative
Heated Seat Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category. See: Testing and Inspection/Initial Inspection and
Diagnostic Overview/Diagnostic Starting Point - Vehicle
Circuit/System Description
The driver and front passenger heated seats are controlled by separate heated seat switches. Both switches are located in the climate control panel (CCP).
When a heated seat switch is pressed, the CCP sends a GMLAN message via the serial data line to the heated seat module indicating the heated seat
request. In response to this signal, the heated seat module activates the heated seat by applying battery voltage to the seat heating elements. The heated
seat module then sends a GMLAN message back to the CCP commanding it to illuminate the appropriate seat temperature indicator.
Circuit/System Testing
Ignition ON, use a scan tool to observe the appropriate Heated Seat Switch parameter while pressing the heated seat switch. The reading should change
between Idle and Pressed.
If not, replace the HVAC control module.
If the parameter displays Pressed, replace the heated seat module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and Procedures
Control Module References for HVAC and heated seat control module replacement, setup, and programming See: Testing and Inspection/Programming
