Diagnostic Aids
The Power Sunroof Actuator Limit Switch can cause the sunroof not to respond correctly to the Power Sunroof Switches 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 Power Sunroof Circuit Description , 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 steps below refer to the test steps in the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
SCHEMATIC REFERENCE: Sunroof Schematics | ||||
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 |
3 | Inspect the RAP fuse for an open. Is the fuse open? | -- | Go to Step 17 | Go to Step 4 |
4 |
Is the voltage within the specified range? | 10-15 V | Go to Step 6 | Go to Step 5 |
5 | Measure the voltage between the vent open circuit of the Power Sunroof Vent Switch and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 15 | Go to Step 8 |
6 | Measure the voltage between the other switch input circuits of the Power Sunroof Switches and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 7 | Go to Step 16 |
7 | Connect a 3 amp fused jumper wire between the vent open circuit of the Power Sunroof Vent Switch and the ground circuit of the Power Sunroof Vent Switch. Does the sunroof close? | -- | Go to Step 19 | Go to Step 8 |
8 |
Is the voltage within the specified range? | 10-15 V | Go to Step 10 | Go to Step 9 |
Measure the voltage between the supply circuit of the Sunroof Control Module and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 22 | Go to Retained Accessory Power (RAP) Inoperative in Retained Accessory Power | |
10 |
Is the resistance less than the specified value? | 3 ohms | Go to Step 11 | Go to Step 23 |
11 |
Is the voltage within the specified range? | 10-15 V | Go to Step 13 | Go to Step 12 |
12 | Measure the voltage between the vent open circuit of the Power Sunroof Vent Switch and a good ground. Is the voltage within the specified range? | 10-15 V | Go to Step 15 | Go to Step 14 |
13 |
Ignoring polarity, is the voltage within the specified range? | 10-15 V | Go to Step 21 | Go to Step 20 |
14 | Test the vent open circuit of the Power Sunroof Vent Switch for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 20 |
15 | Test the ground circuit of the Power Sunroof Vent 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 27 | Go to Step 20 |
16 | Test the switch input circuit of the Power Sunroof Switches 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 27 | Go to Step 20 |
17 | Test the supply circuit of the Sunroof Control Module 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 27 | Go to Step 18 |
18 | Test the motor control circuits of the Sunroof Control 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 27 | Go to Step 21 |
19 | Inspect for a poor connection at the harness connector of the power 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 27 | Go to Step 24 |
20 | Inspect for poor connection at the harness connector of the sunroof 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 27 | Go to Step 25 |
21 | Inspect for a poor connection at the harness connector of the power sunroof actuator. 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 27 | Go to Step 26 |
22 | Repair an open or high resistance in the ground circuit of the Sunroof Control Module. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | -- |
23 | Repair an open or high resistance in the motor control circuits of the Sunroof Control Module. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | -- |
24 | Replace the Power Sunroof Vent Switch. Refer to Sunroof Switch Replacement . Did you complete the replacement? | -- | Go to Step 27 | -- |
25 | Replace the Sunroof Control Module. Refer to Power Sunroof Express Module Replacement . Did you complete the replacement? | -- | Go to Step 27 | -- |
26 |
Important: Inspect the Power Sunroof Assembly for binding or mechanical failure. Replace the Power Sunroof Actuator. Refer to Power Sunroof Motor Replacement . Did you complete the replacement? | -- | Go to Step 27 | -- |
27 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
