GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Perform the sunroof re-calibration.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 2

2

  1. Disconnect the sunroof switch harness connector.
  2. Connect a test lamp from battery voltage to the ground circuit terminal in the switch harness connector.

Does the test lamp illuminate?

Go to Step 3

Go to Step 10

3

  1. Turn the ignition ON.
  2. Using a DMM, test for battery voltage on all of the switch signal circuits in the switch harness connector.

Is battery voltage present on all of the switch signal circuits?

Go to Step 8

Go to Step 4

4

Is battery voltage present on any of the switch signal circuits?

Go to Step 9

Go to Step 5

5

  1. Disconnect the sunroof motor/actuator connector.
  2. Connect a test lamp from the battery supply circuit terminal in the harness connector to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 11

6

  1. Connect a test lamp from the ignition signal circuit terminal in the sunroof motor/actuator harness connector to a good ground.
  2. Turn the ignition ON.

Does the test lamp illuminate?

Go to Step 7

Go to Step 12

7

Connect a test lamp from battery voltage to the ground circuit terminal in the sunroof motor/actuator harness connector.

Does the test lamp illuminate?

Go to Step 15

Go to Step 13

8

Connect a fused jumper wire from each of the switch signal circuits in the switch harness connector to ground.

Does the sunroof operate using a fused jumper wire in place of the switch?

Go to Step 14

Go to Step 15

9

Test the faulted switch signal circuit for an open or short to ground.

Did you find and correct the condition?

Go to Step 18

Go to Step 15

10

Repair the sunroof switch ground circuit for an open or high resistance.

Is the repair complete?

Go to Step 18

--

11

Repair the sunroof motor/actuator battery supply circuit for an open or short to ground.

Is the repair complete?

Go to Step 18

--

12

Repair the sunroof motor/actuator ignition signal circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs .

Is the repair complete?

Go to Step 18

--

13

Repair the sunroof motor/actuator ground circuit for an open or high resistance.

Is the repair complete?

Go to Step 18

--

14

Inspect for a poor connections at the sunroof switch harness connector.

Did you find and correct the condition?

Go to Step 18

Go to Step 16

15

Inspect for a poor connection at the sunroof motor/actuator harness connector.

Did you find and correct the condition?

Go to Step 18

Go to Step 17

16

Replace the sunroof switch. Refer to Sunroof Switch Replacement .

Did you complete the replacement?

Go to Step 18

--

17

Replace the sunroof motor.

Did you complete the replacement?

Go to Step 18

--

18

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1