GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: This test assumes that the seat cushions are warm with the heated seat OFF and the ignition switch in the ON position.

1

Did you perform the Diagnostic System Check-Power Seat Systems?

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Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

Verify that the Heated Seat Always On complaint is present.

Does the heated seat system operate as described in the Heated Seats Circuit Description?

--

Go to 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 Heated Seat Switch parameter in the Driver Door Module data list.

Does the Heated Seat Switch parameter display ON?

--

Go to Step 4

Go to Step 5

4

  1. Disconnect the door module connector C1.
  2. Measure the resistance from the off switch signal circuit of the door module connector to a good ground.

Does the resistance measure less than the specified value?

10 ohms

Go to Step 7

Go to Step 8

5

  1. Disconnect the heated seat module connector C1.
  2. Measure the resistance from the heated seat switch signal circuit of the module connector to a good ground.

Does the resistance measure less than the specified value.

10 ohms

Go to Step 6

Go to Step 11

6

Test the heated seat switch 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 16

Go to Step 9

7

Test the off switch signal circuit between the heated seat switch and the door 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 16

Go to Step 10

8

Inspect the for poor connections at the harness connector of the door 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 16

Go to Step 12

9

Inspect the for poor connections at the harness connector of the rear integration 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 16

Go to Step 13

10

Inspect the 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 16

Go to Step 14

11

Inspect the 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 16

Go to Step 15

12

Replace the door control module. Refer to Door Control Module Replacement in Doors.

Did you complete the replacement?

--

Go to Step 16

--

13

Replace the rear integration module. Refer to Rear Integration Body Control Module Replacement in Body Control Systems.

Did you complete the replacement?

--

Go to Step 16

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14

Replace the heated seat switch. Refer to Heated Seat Switch Replacement in doors.

Did you complete the replacement?

--

Go to Step 16

--

15

Replace the heated seat module. Refer to Heater Module Replacement .

Did you complete the replacement?

--

Go to Step 16

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16

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2