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 switch express 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.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Sunroof Schematics Connector End View Reference: Sunroof Connector End Views DEFINITION: The sunroof express open or close feature is inoperative. All other sunroof functions operate OK. | ||||
1 | Have you conducted Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 | Attempt to operate the power sunroof through its full range of functions in order to verify that the power sunroof express open/close features are inoperative. Does the Power Sunroof System operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 | Are both the roof express open and express 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? | -- | 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 roof express signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Do you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
8 | Test the appropriate roof open or close switch signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Do 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 . Do 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 . Do you find and correct the condition? | -- | Go to Step 13 | Go to Step 12 |
11 | Replace the sunroof switch. Refer to Sunroof Switch Replacement . Have you finished the replacement? | -- | Go to Step 13 | -- |
12 | Replace the sunroof control module. Refer to Control Module References to replace, set and program. Have you finished the replacement? | -- | Go to Step 13 | -- |
13 | Operate the system to verify the repair. Do you find and correct the condition? | -- | System OK | Go to Step 2 |
