Diagnostic Aids
The Power Sunroof Actuator Limit Switch can cause the sunroof not to respond correctly to the Power Sunroof Switches with a short to ground or an open. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. If the circuits test OK, measure the resistance of the Limit Switch, resistance should be indicated in the sunroof positions mentioned in the Power Sunroof Circuit Description otherwise an open should be indicated. An intermittent or poor connection can also cause the sunroof not to opreate normally. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
Test Description
The steps below refer to the test steps in the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Power Sunroof Diagnostic System Check? | -- | Go to Step 2 | |
2 | Verify that the customer complaint is still present. Does the sunroof operate OK? | -- | Does the sunroof operate OK? | Go to Step 3 |
3 | Inspect the RAP fuse in the Rear Fuse Block. Was the fuse blown? | -- | Go to Step 18 | Go to Step 4 |
4 |
Is the voltage within the specified range? | 10-15 V | Go to Step 6 | Go to Step 5 |
5 | Measure the voltage between the vent open circuit of the Power Sunroof Vent Switch and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 15 | Go to Step 8 |
6 | Measure the voltage between the other switch input circuits of the Power Sunroof Switches and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 7 | Go to Step 16 |
7 | Connect a 3 amp fused jumper wire between the vent open circuit of the Power Sunroof Vent Switch and the ground circuit of the Power Sunroof Vent Switch. Does the sunroof close? | Go to Step 21 | Go to Step 8 | |
8 |
Is the voltage within the specified range ? | 10-15 V | Go to Step 10 | Go to Step 9 |
Measure the voltage between the supply circuit of the Sunroof Control Module and a good ground. Is the voltage within the specified range ? | 10-15 V | Go to Step 17 | ||
10 |
Is the resistance within the specified range? | 1-3 ohms | Go to Step 11 | Go to Step 19 |
11 |
Is the voltage within the specified range? | 10-15 V | Go to Step 13 | Go to Step 12 |
12 | Measure the voltage between the vent open circuit of the Power Sunroof Vent Switch and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 15 | Go to Step 14 |
13 |
Ignoring polarity, is the voltage within the specified range ? | 10-15 V | Go to Step 23 | Go to Step 22 |
14 | Test the vent open circuit of the Power Sunroof Vent Switch for an open or high resistance. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 22 |
15 | Test the ground circuit of the Power Sunroof Vent Switch for an open or high resistance. Refer to Testing for Continuity and Wiring Repairs | -- | Go to Step 27 | Go to Step 22 |
16 | Test the switch input circuit of the Power Sunroof Switches for a short to ground. Refer to Testing for Continuity and Wiring Repairs | -- | Go to Step 27 | Go to Step 22 |
17 | Repair an open or high resistance in the ground circuit of the Sunroof Control Module. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | -- |
18 | Test the supply circuit of the Sunroof Control Module for a short to ground. Refer to Testing for Continuity and Wiring Repairs Test the supply circuit of the Sunroof Control Module for a short to ground. Refer to Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 27 |
19 | Repair an open or high resistance in the motor control circuits of the Sunroof Control Module. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | -- |
20 | Test the motor control circuits of the Sunroof Control Module for a short to ground. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 27 |
21 | Inspect for a poor connection / terminal tension at the Power Sunroof Switches harness connector. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs | -- | Go to Step 27 | Go to Step 27 |
22 | Inspect for poor connection/ terminal tension at the Sunroof Control Module harness connector. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 27 |
23 | Inspect for a poor connection/ terminal tension at the Power Sunroof Actuator harness connector. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 27 |
24 | Replace the Power Sunroof Vent Switch. Refer to Sunroof Switch Replacement . Did you complete the replacement? | -- | Go to Step 27 | -- |
25 | Replace the Sunroof Control Module. Refer to Power Sunroof Express Module Replacement . Did you complete the replacement? | -- | Go to Step 27 | -- |
26 |
Important: Inspect the Power Sunroof Assembly for binding or mechanical failure. Replace the Power Sunroof Actuator. Refer to Power Sunroof Motor Replacement Did you complete the replacement? | -- | Go to Step 27 | -- |
27 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
