Test Description
The numbers below refer to the step number on the diagnostic table.
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If the system does close properly, then suspect either the sunroof limit switch soft stop signal circuit or the sunroof limit switch low reference circuit for a poor connection or intermittent.
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A open ground circuit between the grounding lug to the ground splice causes the sunroof to operate sluggish and will not complete a close operation. The sunroof system is finding another poor path to ground through another component.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Sunroof Schematics DEFINITION: Sunroof does not soft stop in the fully closed position. | ||||
1 | Did you perform the Power Sunroof Diagnostic System Check? | -- | Go to Step 2 | |
Operate the power sunroof to the close position. Does the system close properly? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | |
3 | When operating the power sunroof, does the sunroof glass slide through the flush close position? | -- | Go to Step 4 | Go to Step 9 |
4 |
Does the voltage measure near the specified value? | B+ | Go to Step 5 | Go to Step 8 |
5 | Measure the reference voltage between the sunroof limit switch soft stop signal circuit and the sunroof limit switch low reference circuit at the sunroof limit switch terminals. Does the voltage measure near the specified value? | B+ | Go to Step 6 | Go to Step 7 |
6 |
Does the voltage measure near the specified value when the sunroof glass passes through the flush close position? | 0V | Go to Step 15 | Go to Step 14 |
7 | Test the sunroof limit switch low reference for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 |
8 | Test the sunroof limit switch soft stop signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 10 |
Test the sunroof module ground circuit for an open or high resistance from the grounding lug on the vehicle to the ground splice. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | |
10 |
Does the resistance measure near the specified value? | OL | Go to Step 11 | Go to Step 14 |
11 | Test the sunroof limit switch soft signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
12 | Inspect the sunroof limit switch low reference circuit for a poor connection at the sunroof 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 16 | Go to Step 15 |
13 | Inspect the limit switch soft stop signal circuit for a poor connection. 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 16 | Go to Step 15 |
14 | Replace the sunroof limit switch (sunroof motor). Refer to Power Sunroof Motor Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
15 | Replace the sunroof module. Refer to Power Sunroof Express Module Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
16 |
Did you correct the condition? | -- | System OK | Go to Step 3 |
