GM Service Manual Online
For 1990-2009 cars only

Power Sunroof Does Not Close

Step

Action

Value(s)

Yes

No

1

Was Power Sunroof System Check performed?

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Go to Step 2

Go to Power Sunroof System Check

2

  1. Turn the ignition to OFF.
  2. Disconnect the 4-way electrical harness connector C1 from the Sunroof Control Module.
  3. Turn the ignition to RUN.
  4. Measure the voltage from connector C1, terminal A, to ground.

Is the voltage within the range specified?

10 - 15 V

Go to Step 3

Go to Retained Accessory Power (RAP) System Check

3

Measure the voltage across terminals A and D of the Sunroof Control Module harness connector C1.

Is the voltage within the range specified?

10 - 15 V

Go to Step 4

Go to Step 10

4

  1. Turn the ignition to OFF.
  2. Reconnect the harness connector C1 to the Power Sunroof module.
  3. Turn the ignition to RUN.
  4. Measure the voltage across terminals A and B of the Sunroof Control Module harness connector C2 at the motor assembly while moving the sunroof slide switch to CLOSE.

Ignoring polarity, is the voltage within range specified?

9 - 15 V

Go to Step 11

Go to Step 5

5

  1. Turn the ignition to OFF.
  2. Disconnect the harness connector C1 from the Overhead Console Sunroof Switch.
  3. Turn the ignition to RUN.
  4. Using a fused jumper wire, jumper terminal 2 to terminal 15 of the Overhead Console Sunroof Slide Switch harness connector C1.

Did the sunroof close?

--

Go to Step 13

Go to Step 6

6

Measure the resistance between terminal 2 of the Overhead Console Sunroof Switch harness connector C1 and ground.

Is the resistance within range specified?

0 - 3 ohms

Go to Step 7

Go to Step 12

7

  1. Disconnect the harness connector C2 from the Sunroof Control Module.
  2. Measure the resistance from terminal 3 of the Sunroof Control Module harness connector C2 to terminal 15 of the Overhead Console Sunroof Slide Switch harness connector C1.

Is the resistance within range specified?

0 - 3 ohms

Go to Step 8

Go to Step 9

8

Replace the Sunroof Control Module.

Is the repair complete?

--

Go to Power Sunroof System Check

--

9

Repair open in CKT 110 between the Overhead Console Sunroof Switch and the Sunroof Control Module.

Is the repair complete?

--

Go to Power Sunroof System Check

--

10

Repair open in ground CKT 1050.

Is the repair complete?

--

Go to Power Sunroof System Check

--

11

Replace the Power Sunroof Motor Assembly.

Is the repair complete?

--

Go to Power Sunroof System Check

--

12

Repair open in CKT128 between the Overhead Console Sunroof Switch and the Sunroof Control Module

Is the repair complete?

--

Go to Power Sunroof System Check

--

13

Replace the Power Sunroof Slide Switch.

Is the repair complete?

--

Go to Power Sunroof System Check

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