GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2005 🢒 H2 🢒 Body 🢒 Roof 🢒 Power Sunroof Inoperative

Test Description

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

  1. The testing of the ground circuit is to assure a good path to ground. An open at the grounding lug will still illuminate a test lamp, through a weaker redundant grounding path. This path is not sufficient enough to operate the sunroof motor.

Step

Action

Value(s)

Yes

No

Schematic Reference: Sunroof Schematics

Connector End View Reference: Power Roof Systems 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

Operate the power sunroof system.

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 sunroof switch harness connector.
  2. Turn ignition ON, with engine OFF.
  3. Connect a test lamp between the retained accessory power (RAP) relay switched output circuit at the sunroof switch harness connector and a good ground.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 10

4
  1. Connect a fused jumper wire to the RAP relay switched output circuit at the sunroof switch harness connector.
  2. Observing the position of the sunroof glass, try to operate the sunroof system by connecting the other end of the fused jumper wire at the sunroof switch harness connector, to either of the following:
    3. • Sunroof switch open/tilt up signal circuit
    • Sunroof switch close/tilt down signal circuit

Does the system operate normally?

--

Go to Step 13

Go to Step 5

5
  1. Disconnect the sunroof actuator motor harness connector.
  2. Test the sunroof switch open/tilt down signal circuit for an open, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 23

Go to Step 6

6

Test the sunroof switch close/tilt up signal circuit for an open, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 23

Go to Step 7

7

Connect a test lamp between the RAP relay switched output circuit at the sunroof actuator motor harness connector and a good ground.

Does the test lamp illuminate?

--

Go to Step 8

Go to Step 19

8

Connect a test lamp between the RAP relay switched output circuit and the ground circuit at the sunroof actuator motor harness connector.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 16

9

Measure the resistance between the sunroof actuator motor ground, at the sunroof actuator motor harness connector, to a good ground. Refer to Circuit Testing in Wiring Systems.

Does the resistance measure near the specified value?

0-3 ohms

Go to Step 14

Go to Step 17

10
  1. Disconnect the sunroof actuator motor harness connector.
  2. Connect a test lamp between the RAP relay switched output circuit at the sunroof actuator motor harness connector and a good ground.

Does the test lamp illuminate?

--

Go to Step 20

Go to Step 11

11

Test the RAP relay switched output circuits 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 23

Go to Step 12

12

Test the sunroof switch open/tilt down and close/tilt up signal circuits 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 23

Go to Retained Accessory Power (RAP) Inoperative in Computer/Integrating Systems

13

Inspect for a poor connection at the sunroof switch and harness connector. 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 23

Go to Step 21

14

Inspect for a poor connection at the sunroof actuator motor. 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 23

Go to Step 15

15

Measure the resistance between the sunroof switch open/tilt down and the sunroof switch close/tilt up signal circuits. Refer to Circuit Testing in Wiring Systems.

Does the resistance measure near the specified value?

OL

Go to Step 22

Go to Step 19

16

Repair the ground circuit of the sunroof actuator motor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

17

Repair the ground circuit of the sunroof actuator motor for an open or high resistance. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

18

Repair a short between the sunroof switch open/tilt down and sunroof switch close/tilt up signal circuits. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

19

Repair an open in the RAP relay switched output circuit to the sunroof actuator motor. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

20

Repair the RAP relay switched output circuit for an open or a high resistance to the sunroof switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

21

Replace the sunroof switch. Refer to Sunroof Switch Replacement .

Did you complete the replacement?

--

Go to Step 23

--

22

Replace the sunroof actuator motor. Refer to Power Sunroof Motor Replacement .

Did you complete the replacement?

--

Go to Step 23

--

23
  1. Turn OFF the ignition.
  2. Remove any jumper wires.
  3. Connect all previously disconnected components.
  4. Replace the fuse if necessary.
  5. Turn ON the ignition, with the engine OFF.
  6. Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3