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? | -- | Go to Diagnostic Aids | Go to Step 3 |
3 | Inspect the RAP fuse in the Rear Fuse Block. Was the fuse blown? | -- | Go to Step 16 | Go to Step 4 |
4 |
Is the voltage within range specified? | 10-15 V | Go to Step 6 | Go to Step 5 |
5 | Measure the voltage between the slide close circuit of the Power Sunroof Slide Switch and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 14 | Go to Step 7 |
6 | Connect a 3 amp fused jumper wire between the slide close circuit of the Power Sunroof Slide Switch and the ground circuit of the Power Sunroof Slide Switch. Does the sunroof close? | -- | Go to Step 19 | Go to Step 7 |
7 |
Is the voltage within the specified range ? | 10-15 V | Go to Step 9 | Go to Step 8 |
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 15 | ||
9 |
Is the resistance within the specified range? | 1-3 ohms | Go to Step 10 | Go to Step 17 |
10 |
Is the voltage within the specified range? | 10-15 V | Go to Step 12 | Go to Step 11 |
11 | Measure the voltage between the slide close circuit of the Power Sunroof Slide Switch and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 14 | Go to Step 13 |
12 |
Ignoring polarity, is the voltage within the specified range ? | 10-15 V | Go to Step 21 | Go to Step 20 |
13 | Test the slide close circuit of the Power Sunroof Slide 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 22 | Go to Step 20 |
14 | Test the ground circuit of the Power Sunroof Slide 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 25 | Go to Step 20 |
15 | 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 25 | -- |
16 | Test the supply circuit of the Sunroof Control Module for a short to ground. Refer to Testing for Continuity and Wiring Repairs to in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 18 |
17 | 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 25 | -- |
18 | 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 25 | Go to Step 20 |
19 | Inspect for a poor connection / terminal tension at the Power Sunroof Switches 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 25 | Go to Step 22 |
20 | 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 25 | Go to Step 23 |
21 | 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 25 | Go to Step 24 |
22 | Replace the Power Sunroof Slide Switch. Refer to Sunroof Switch Replacement Did you complete the replacement? | -- | Go to Step 25 | -- |
23 | Replace the Sunroof Control Module. Refer to Power Sunroof Express Module Replacement . Did you complete the replacement? | -- | Go to Step 25 | -- |
24 |
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 25 | -- |
25 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
