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

1

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

Go to Step 2

Go to Symptoms - Seats

2

Verify that the Heated Seat Switch High Indicator Malfunction complaint is present.

Does the heated seat switch high indicator 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

Turn ON the ignition, with the engine OFF.

Is the HIGH indicator of the heated seat switch always on?

Go to Step 6

Go to Step 4

4

  1. Disconnect the heated seat switch harness connector.
  2. Connect a 3-amp fused jumper wire from the ground terminal of the heated seat switch to a good ground.
  3. Momentarily connect a test lamp from battery positive voltage to the high indicator terminal of the heated seat switch.

Does the HIGH indicator of the heated seat switch illuminate?

Go to Step 5

Go to Step 9

5

Test the heated seat high indicator control circuit between the heated seat switch and the heated seat module for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

6

Test the heated seat high indicator control circuit between the heated seat switch and the heated seat module for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 7

7

Test the ground circuit of the heated seat module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

8

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 12

Go to Step 10

9

Inspect for poor connections at the harness connector of the heated seat switch. 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 12

Go to Step 11

10

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

Did you complete the replacement?

Go to Step 12

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11

Replace the heated seat switch. Refer to Front Seat Heater Switch Replacement .

Did you complete the replacement?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2