GM Service Manual Online
For 1990-2009 cars only

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step will test for an intermittent condition when testing whether the sunroof will slide and soft stop in vent position. If the sunroof operates properly to the full vent position, then inspect the sunroof limit switch position 1-LS1 for a stuck switch causing an intermittent short to ground.

  2. Testing for a short to ground in the sunroof limit switch position 1-LS1 circuit or a stuck/closed limit switch.

Step

Action

Value(s)

Yes

No

Schematic Reference: Sunroof Schematics

Connector End View Reference: Power Roof Systems Connector End Views

DEFINITION: Sunroof will slide and hard stop past the soft stop full vent position. As the glass slides past the soft stop vent position the glass tends to shift out of alignment.

1

Did you perform the A Diagnostic System Check - Power Sunroof?

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Go to Step 2

Go to Diagnostic System Check - Power Sunroof

2

Operate the power sunroof to the vent position.

Does the system operate normally?

--

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

Go to Step 3

3

  1. Disconnect the harness connector to the sunroof opening position switch.
  2. Turn the ignition ON, with the engine OFF.
  3. Measure the reference voltage between the sunroof limit switch position 1-LS1 circuit at the sunroof opening position switch harness connector to a good ground.

Does the voltage measure near the specified value?

5 V

Go to Step 5

Go to Step 4

4

Test the sunroof limit switch position 1-LS1 circuit 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 7

Go to Step 6

5

Replace the sunroof opening position switch. Refer to Sunroof Opening Position Switch Replacement .

Did you complete the replacement?

--

Go to Step 7

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6

Replace the sunroof control module. Refer to Sunroof Motor/Actuator Replacement .

Did you complete the replacement?

--

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3