Diagnostic Aids
If the front glass and/or front sunshade are experiencing an intermittent inoperative condition, check the sunroof switch ground circuit for an open condition. If the sunroof switch ground circuit is open, the switch may take a redundant path to ground through the illumination circuit. When the lights are turned ON, the redundant path is removed, and the sunroof and/or sunshade will become inoperative.
If voltage is not measured on the sunroof switch open signal or sunroof switch close signal circuits, the fault could be in the RAP relay switch supply voltage circuit, battery positive voltage circuit, or front glass control module ground circuit. If the front glass control module is not being powered, neither will the sunroof switch signal circuits.
If the sunroof switch open signal circuit or sunroof switch close signal circuit is found to be short to voltage, the sunroof switch will most likely be open.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step is used to determine the correct diagnostic path. The path depends on if the front glass is inoperative and in the open position, or if the front glass is inoperative and in the closed position.
-
This step tests the sunroof switch open switch.
-
This step tests the sunroof switch close switch.
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? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Attempt to operate the front glass through its full range of functions in order to verify that the power sunroof inoperative fault is present. Does the power sunroof system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
Is the front glass in the fully closed position? | -- | Go to Step 4 | Go to Step 8 | |
Did the front glass open? | -- | Go to Step 16 | Go to Step 5 | |
5 |
Does the voltage measure near the specified value? | B+ | Go to Step 7 | Go to Step 6 |
6 | Measure the voltage from the sunroof switch open signal circuit of the sunroof switch harness connector to a good ground. Does the voltage measure near the specified value? | B+ | Go to Step 18 | Go to Step 12 |
7 |
Does the voltage measure near the specified value? | -- | Go to Step 19 | Go to Step 17 |
Did the front glass close? | B+ | Go to Step 16 | Go to Step 9 | |
9 |
Does the voltage measure near the specified value? | B+ | Go to Step 11 | Go to Step 10 |
10 | Measure the voltage from the sunroof switch close signal circuit of the sunroof switch harness connector to a good ground. Does the voltage measure near the specified value? | B+ | Go to Step 18 | Go to Step 12 |
11 |
Does the voltage measure near the specified value? | B+ | Go to Step 19 | Go to Step 17 |
12 |
Does the voltage measure near the specified value? | B+ | Go to Step 13 | Go to Symptoms - Computer/Integrating Systems in Computer/Integrating Systems |
13 | Measure the voltage from the battery positive voltage circuit of the front glass control module harness connector to the ground circuit of the front glass control module harness connector. Does the voltage measure near the specified value? | -- | Go to Step 15 | Go to Step 14 |
14 | Measure the voltage from the battery positive voltage circuit of the front glass control module harness connector to a good ground. Does the voltage measure near the specified value? | -- | Go to Step 20 | Go to Step 21 |
15 | Test the appropriate sunroof switch signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 24 | Go to Step 17 |
16 | Inspect for poor connections at the harness connector of the sunroof switch. 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 24 | Go to Step 22 |
17 | Inspect for poor connections at the harness connectors of the front glass 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 24 | Go to Step 23 |
18 | Repair the open in the sunroof switch ground circuit. Refer to Wiring Repairs and Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 24 | -- |
19 | Repair the short to voltage in the appropriate sunroof switch signal circuit. Refer to Wiring Repairs and Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 24 | -- |
20 | Repair the open in the front glass control module ground circuit. Refer to Wiring Repairs and Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 24 | -- |
21 | Repair the short to ground or open in the front glass control module battery positive voltage circuit. Refer to Wiring Repairs and Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 24 | -- |
22 | Replace the sunroof switch. Refer to Sunroof Switch Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- |
23 | Replace the front glass control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 24 | -- |
24 | Operate the system in order to verify the repair. Did you find and correct the condition? | -- | System OK | Go to Step 2 |
