GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the power sunroof system operation and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

2

Verify that the sunroof is inoperative.

Does the sunroof operate normally?

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

Go to Step 3

3

  1. Turn the ignition to RUN or ACC, with the engine OFF.
  2. Disconnect sunroof module connector C2.
  3. Using a J 39200 digital multimeter (DMM), measure the continuity from cavity 2 (BRN) and cavity 3 (DK BLU) while depressing the switch in the OPEN position. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

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Go to Step 7

Go to Step 4

4

Inspect for an open, high resistance or short to ground in the BRN wire between the sunroof module and the sunroof control switch. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

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Go to Step 5

Go to Step 6

5

Repair the open, high resistance or short to ground. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 8

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6

Replace the sunroof control switch. Refer to Driver Information Center Module Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Step 8

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7

Replace the sunroof module. Refer to Power Sunroof Module Replacement .

Is the repair complete?

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Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3