GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics

Connector End View Reference: Power Seat Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

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 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 control module harness connector C1.
  2. Measure the resistance from the heated seat 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 harness connector C1.
  2. Measure the resistance from the heated seat high/low 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 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 16

Go to Step 9

7

Test the heated seat switch signal circuit between the heated seat switch and the door control 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 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 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 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 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

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13

Replace the rear integration module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

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

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15

Replace the heated seat module. Refer to Control Module References in Computer/integrating Systems for replacement, setup, and programming.

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