GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Heated Seats Schematics

Connector End View Reference: Power Seat Connector End Views or Body Control System Connector End Views in Body Control System

DEFINITION: The driver or passenger seat stays warm.

1

Did you review the heated seat operation and perform the necessary inspection?

Go to Step 2

Go to Symptoms - Seats

2

Verify that the Heated Seat Always On complaint is present.

Does the heated seat system operate as described in the system description and operation?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the appropriate Heated Seat Switch parameter in the HVAC Control Module data list.

Does the Heated Seat Switch parameter display Pressed?

Go to Step 7

Go to Step 4

4

Test the heated seat control module high/low signal circuit between the rear integration module and the heated seat module for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 5

5

Test the heated seat control module status signal circuit between the rear integration module and the heated seat module for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Inspect for poor connections at the harness connector of the heated seat module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the heated seat module. Refer to Front Seat Heater Control Module Replacement .

Did you complete replacement?

Go to Step 10

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9

Replace the HVAC control module. Refer to HVAC Control Module Replacement in HVAC Systems - Automatic.

Did you complete the replacement?

Go to Step 10

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10

Operate the system in order to verify the repair

Did you correct the condition?

System OK

Go to Step 2