Diagnostic Aids
If the sunroof is experiencing an intermittent inoperative condition, check the sunroof switch ground circuit for an open. If the sunroof switch ground circuit is open, the switch may take a redundant path to ground through the switch illumination circuit. When the lights are turned ON, the redundant path to ground is removed and the sunroof will become inoperative.
If the sunroof open vent switch signal circuit is found to be short to voltage, the sunroof switch will most likely be open.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Sunroof Schematics Connector End View Reference: Power Roof Systems Connector End Views DEFINITION: The sunroof vent express open or close feature is inoperative. All other sunroof functions operate OK. | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 | Attempt to operate the roof vent through its full range of functions in order to verify that the vent express open/close features are inoperative. Does the power sunroof vent express feature operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 | Are both the vent express open and close functions inoperative? | -- | Go to Step 4 | Go to Step 6 |
4 |
Does the voltage measure near the specified value? | B+ | Go to Step 5 | Go to Step 7 |
Did the roof express open to the vent position? | -- | Go to Step 9 | Go to Step 10 | |
6 |
Does the voltage measure near the specified value? | B+ | Go to Step 9 | Go to Step 8 |
7 | Test the vent express signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
8 | Test the appropriate vent open or close switch signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
9 | Inspect for poor connections at the harness connector of the sunroof switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 11 |
10 | Inspect for poor connections at the harness connectors of the sunroof control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12 |
11 | Replace the sunroof switch. Refer to Sunroof Switch Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- |
12 | Replace the sunroof control module. Refer to Control Module References . Did you complete the replacement? | -- | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you find and correct the condition? | -- | System OK | Go to Step 2 |
