Diagnostic Aids
| • | The RAP relay supplies power to the SUNRF fuse. If the SUNRF fuse is open and the RAP system is operating properly, the fault could be a short to ground in either of the sunroof motor control circuits. A short to ground in either of these circuits would open the SUNRF fuse. |
| • | If voltage is not measured on the sunroof switch open signal or sunroof switch open vent signal circuits, the fault could be in the accessory voltage or sunroof control module ground circuits. If the sunroof control module is not being powered, neither will the sunroof switch signal circuits. |
Test Description
-
This step tests to determine if the RAP relay is providing power to the SUNRF fuse.
-
This step is used to determine the correct diagnostic path. The path depends on if the sunroof is inoperative and in the open position, or if the sunroof is inoperative and in the closed position.
-
This step tests the sunroof switch open switch.
-
This step tests the sunroof switch close switch.
-
This step tests the sunroof control module for an internal open.
-
This step tests the sunroof control module for an internal short to voltage.
-
This step tests the sunroof motor for an open.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Sunroof Schematics Connector End View Reference: Power Roof Systems Connector End Views | ||||
1 | Did you review the Sunroof Description and Operation? | -- | Go to Step 2 | Go to Symptoms - Roof |
2 | Attempt to operate the power sunroof through its full range of functions in order to verify that the power sunroof inoperative fault is present. Does the power sunroof system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
Does the test lamp illuminate? | -- | Go to Step 4 | Go to Diagnostic System Check - Retained Accessory Power in Retained Accessory Power | |
Is the power sunroof in the fully closed position? | -- | Go to Step 5 | Go to Step 6 | |
Did the power sunroof open? | -- | Go to Step 19 | Go to Step 7 | |
Did the power sunroof close? | B+ | Go to Step 19 | Go to Step 7 | |
7 |
Does the voltage measure near the specified value? | B+ | Go to Step 8 | Go to Step 9 |
8 | Measure the voltage from the sunroof switch open vent signal circuit of the sunroof switch harness connector to a good ground. Does the voltage measure near the specified value? | B+ | Go to Step 12 | Go to Step 16 |
9 | Test the sunroof switch open signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | B+ | Go to Step 26 | Go to Step 10 |
10 |
Does the voltage measure near the specified value? | -- | Go to Step 11 | Go to Step 15 |
Measure the voltage from the sunroof accessory voltage circuit of the sunroof control module harness connector C1 to the ground circuit of the sunroof control module harness connector C1. Does the voltage measure near the specified value? | B+ | Go to Step 20 | Go to Step 22 | |
12 | Measure the voltage from the sunroof switch open vent signal circuit of the sunroof switch harness connector to the sunroof switch low reference circuit of the sunroof switch harness connector. Does the voltage measure near the specified value? | -- | Go to Step 13 | Go to Step 17 |
Does the test lamp illuminate? | -- | Go to Step 20 | Go to Step 14 | |
Does the test lamp illuminate in both positions? | -- | Go to Step 21 | Go to Step 18 | |
15 | Test the accessory voltage circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 18 |
16 | Test the sunroof switch open vent signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 20 |
17 | Test the sunroof switch low reference circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 20 |
18 | Test the sunroof motor control circuits for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 20 |
19 | Inspect for poor connections at the harness connector of the sunroof switch. 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 26 | Go to Step 23 |
20 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 24 |
21 | Inspect for poor connections 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 26 | Go to Step 25 |
22 | Repair the open in the sunroof control module ground circuit. Refer to Wiring Repairs and Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 26 | -- |
23 | Replace the sunroof switch. Refer to Sunroof Switch Replacement . Did you complete the replacement? | -- | Go to Step 26 | -- |
24 | Replace the sunroof control module. Refer to Sunroof Control Module Replacement . Did you complete the replacement? | -- | Go to Step 26 | -- |
25 | Replace the sunroof motor. Refer to Sunroof Motor/Actuator Replacement . Did you complete the replacement? | Go to Step 26 | -- | |
26 | Operate the system in order to verify the repair. Did you find and correct the condition? | -- | System OK | Go to Step 2 |
