Enclave FWD V6-3.6L (2008)
Seat Heater: Symptom Related Diagnostic Procedures
Symptoms - Seat Heating and Cooling
Symptoms - Seat Heating and Cooling
Important: The following steps must be completed before using the symptom tables.
1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true:
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There are no DTCs set.
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The control modules can communicate via the serial data link. See: Testing and Inspection/Initial Inspection and Diagnostic
Overview/Diagnostic System Check - 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
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Inspect for aftermarket devices which could affect the operation of the system.
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Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
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 a symptom diagnostic procedure from the following list in order to diagnose the symptom:
Heated Seat Inoperative
Heated Seat Inoperative
Heated Seat Inoperative
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection/Initial Inspection and
Diagnostic Overview/Diagnostic System Check - Vehicle
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Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
The driver and front passenger heated seats are controlled by separate heated seat switches. The switches are located on the door panels. When a heated
seat switch is pressed, ground is momentarily applied through the switch contacts and the switch signal circuit to the door module. In response to this
signal, the door module sends a message via the low speed GMLAN serial data line to the memory seat module (MSM) indicating the heat seat request.
The door module then applies voltage through the appropriate indicator control circuits to the heated seat switch illuminating the appropriate indicators.
Circuit/System Verification
1. Ignition ON, observe the following scan tool parameters in the appropriate driver or passenger door switch data list while pressing and releasing
the appropriate switch. The readings should change between ACTIVE and INACTIVE.
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Seat Back Heat Mode Sw.
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Seat Heat Mode Sw.
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If not the specified value, refer to Heated Seat Switch Malfunction.
2. If the switches operate normally, replace the appropriate door control module.
Circuit/System Testing
Heated Seat Switch Malfunction
