Test Description
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 7: Using a jumper wire to jump between the sunroof limit switch soft stop signal circuit and the sunroof limit switch low reference circuit, will simulate that the sunroof glass is in a position other than close or full open position. This will allow any request from the sunroof switch to supply an output to drive the sunroof motor for testing the status of the limit switches.
- 11: Checking the sunroof motor open and close output circuits, both should be at ground potential when idle.
Power Sunroof Inoperative
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Power Sunroof Schematics Connector End Views Reference: Power Roof Systems Connector End Views |
||||
| 1 | Did you review the Power Sunroof Description and Operation and perform the necessary inspections? | - | Go to Step 2 | Go to Symptoms - Roof |
| 2 | Operate the power sunroof. Does the system operate normally? |
- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 |
|
4.5-5.5 V | Go to Step 4 | Go to Step 13 |
| 4 | Measure the reference voltage of the sunroof switch close signal circuit at the sunroof switch harness connector to a good ground. Does the voltage measure near the specified value? |
4.5-5.5 V | Go to Step 5 | Go to Step 18 |
| 5 | Measure the reference voltage between the sunroof switch close signal circuit and the sunroof switch low reference circuit at the sunroof switch harness connector. Does the voltage measure near the specified value? |
4.5-5.5 V | Go to Step 6 | Go to Step 22 |
| 6 |
|
- | Go to Step 28 | Go to Step 7 |
| 7 |
NOTE:
Do not open the sunroof glass past the full open soft stop position. Doing so may damage the sunroof assembly and or the roof top.
|
- | Go to Step 8 | Go to Step 11 |
| 8 | Test the sunroof limit switch range signal circuit for an open, high resistance or a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 9 |
| 9 | Test the sunroof limit switch low reference circuit for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 32 |
| 10 | Test the sunroof limit switch low reference for a short to B+. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 11 |
| 11 |
|
- | Go to Step 37 | Go to Step 12 |
| 12 |
|
- | Go to Step 30 | Go to Step 23 |
| 13 | Did the reference voltage of the sunroof switch open signal circuit measure near the specified value? | B+ | Go to Step 14 | Go to Step 15 |
| 14 | Measure the reference voltage of the sunroof switch close signal circuit at the sunroof switch harness connector to a good ground. Does the voltage measure near the specified value? |
B+ | Go to Step 17 | Go to Step 26 |
| 15 | Measure the reference voltage of the sunroof switch close signal circuit at the sunroof switch harness connector to a good ground. Does the voltage measure near the specified value? |
4.5-5.5 V | Go to Step 19 | Go to Step 16 |
| 16 |
|
B+ | Go to Step 29 | Go to Step 27 |
| 17 | Measure between the sunroof ignition 3 voltage circuit and the ground circuit at the sunroof control module harness connector. Does the voltage measure near the specified value? |
B+ | Go to Step 29 | Go to Step 33 |
| 18 | Did the reference voltage of the sunroof switch close signal circuit measure near the specified value? | B+ | Go to Step 21 | Go to Step 20 |
| 19 | Test for an open, high resistance or short to ground in the sunroof switch open signal circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 29 |
| 20 | Test for an open, high resistance or short to ground in the sunroof switch close signal circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 29 |
| 21 | Test the sunroof switch close signal circuit for a short to B+. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 37 |
| 22 | Test the sunroof switch low reference circuit for an open, high resistance or a short to B+. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 29 |
| 23 | Did the test lamp illuminate with either command? | - | Go to Step 23 | Go to Step 25 |
| 24 | Test both sunroof motor control 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 39 | Go to Step 29 |
| 25 | Test both sunroof motor control circuits for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 29 |
| 26 | Test the sunroof switch open signal circuit for a short to B+. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 37 |
| 27 | Test the ignition 3 voltage circuit for an open, high resistance or short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 39 | Go to Step 31 |
| 28 | Inspect for a poor connection at the sunroof switch 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 39 | Go to Step 36 |
| 29 | Inspect for a poor connection at the sunroof control module. 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 39 | Go to Step 37 |
| 30 | Inspect for poor connections at the sunroof 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 39 | Go to Step 38 |
| 31 | Inspect for poor connections at the PWR WDO CB circuit breaker. 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 39 | Go to Step 34 |
| 32 | Inspect for poor connections at the limit switches. 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 39 | Go to Step 35 |
| 33 | Repair the ground circuit of the sunroof control module for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 39 | - |
| 34 | Replace the circuit breaker. Did you complete the repair? |
- | Go to Step 39 | - |
| 35 | Replace the sunroof limit switch. Refer to Sunroof Motor/Actuator Replacement . Did you complete the repair? |
- | Go to Step 39 | - |
| 36 | Replace the sunroof switch. Refer to Sunroof Switch Replacement . Did you complete the replacement? |
- | Go to Step 39 | - |
| 37 | Replace the sunroof control module. Refer to Sunroof Control Module Replacement . Did you complete the replacement? |
- | Go to Step 39 | - |
| 38 | Replace the sunroof actuator. Refer to Sunroof Motor/Actuator Replacement . Did you complete the replacement? |
- | Go to Step 39 | - |
| 39 |
|
- | System OK | Go to Step 3 |