Diagnostic Aids
The sunroof limit switch can cause the sunroof not to automatically close to the flush close position, with a short to ground or an open. Refer to Circuit Testing 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 Sunroof Description and Operation , otherwise an open should be indicated. An intermittent or poor connection can also cause the sunroof not to operate normally. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Determining if the sunroof is inoperative or is unable to automatically close to the flush close position.
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Test for RAP relay switch supply voltage of the sunroof module. If voltage is not present, go to the RAP Inoperative table.
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Test the sunroof limit switch to determine if it is functioning correctly. The sunroof limit switch will close when the sunroof glass reaches the flush closed and comfort stop positions.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Sunroof Schematics DEFINITION: Sunroof may not close automatically to the flush close position, or be inoperative in any slide open position (not vent). | ||||
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 |
Does the sunroof slide in any direction? | -- | Go to Step 13 | Go to Step 4 | |
4 | Inspect the RAP fuse for an open. Is the fuse open? | -- | Go to Step 20 | Go to Step 5 |
5 |
Is the voltage within the specified range? | 10-15 V | Go to Step 7 | Go to Step 6 |
6 | Measure the voltage between the sunroof switch close signal circuit of the sunroof slide switch harness connector and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 19 | Go to Step 8 |
7 | Connect a 3-amp fused jumper wire between the sunroof switch close signal circuit and the sunroof switch low reference circuit of the sunroof slide switch harness connector. Does the sunroof close? | -- | Go to Step 22 | Go to Step 11 |
8 | Measure the voltage between the other sunroof switch signal circuits of the sunroof switch harness connector and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 18 | Go to Step 9 |
9 |
Is the voltage within the specified range? | 10-15 V | Go to Step 24 | Go to Step 10 |
Measure the voltage between the RAP relay switch supply voltage circuit of the sunroof module harness connector and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 26 | Go to Retained Accessory Power (RAP) Inoperative in Retained Accessory Power | |
11 |
Is the resistance less than the specified value? | 3 ohms | Go to Step 12 | Go to Step 27 |
12 |
Ignoring polarity, is the voltage within the specified range? | 10-15 V | Go to Step 25 | Go to Step 23 |
13 |
Is the voltage within the specified range? | 10-15 V | Go to Step 14 | Go to Step 16 |
14 | Measure the voltage of the sunroof limit switch soft stop signal circuit and the sunroof limit switch low reference circuit of the sunroof motor harness connector. Is the voltage within the specified range? | 10-15 V | Go to Step 15 | Go to Step 17 |
As the sunroof reaches the flush closed position, did the voltage measure near the specified value? | 0 V | Go to Step 29 | Go to Step 30 | |
16 | Test the sunroof limit switch soft stop signal circuit for an open, high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 31 | Go to Step 24 |
17 | Test the sunroof limit switch low reference circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 31 | Go to Step 24 |
18 | Test the sunroof switch close signal circuit of the sunroof slide switch 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 31 | Go to Step 24 |
19 | Test the sunroof switch low reference circuit of the sunroof slide switch 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 31 | Go to Step 24 |
20 | Test the RAP relay switch supply voltage circuit of the sunroof module harness connector for a short to ground. Refer to Circuit Testing and Wiring Repairs to in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 31 | Go to Step 21 |
21 | Test the sunroof motor control circuits of the sunroof module 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 31 | Go to Step 25 |
22 | Inspect for a poor connection at the harness connector of the sunroof switches. 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 31 | Go to Step 28 |
23 | Test the sunroof limit switch close signal circuit for a short to B+. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 31 | Go to Step 24 |
24 | Inspect for poor connection at the harness connector of 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 31 | Go to Step 29 |
25 | Inspect for a poor connection at the harness connector of the sunroof motor. 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 31 | Go to Step 30 |
26 | Repair an open or high resistance in the ground circuit of the sunroof module. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 31 | -- |
27 | Repair an open or high resistance in the sunroof motor control circuits of the sunroof module. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 31 | -- |
28 | Replace the sunroof slide switch. Refer to Sunroof Switch Replacement . Did you complete the replacement? | -- | Go to Step 31 | -- |
29 | Replace the sunroof module. Refer to Power Sunroof Express Module Replacement . Did you complete the replacement? | -- | Go to Step 31 | -- |
30 |
Important: Inspect the sunroof assembly for binding or mechanical failure. Replace the sunroof motor. Refer to Power Sunroof Motor Replacement . Did you complete the replacement? | -- | Go to Step 31 | -- |
31 |
Did you correct the condition? | -- | System OK | Go to Step 2 |
