Diagnostic Aids
When testing the sunroof motor open or close control circuits, note the sunroof glass position. If the glass is in the full open or full vent position, any request to operate the glass beyond its limit, may result with no power output to the sunroof motor.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Sunroof Schematics Connector End View Reference: Power Roof Systems Connector End Views or Power and Grounding Connector End Views in Wiring Systems | ||||
1 | Did you review the Power Sunroof Description and Operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms - Roof |
2 | Operate the power sunroof. Does the system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the voltage measure near the specified value? | B+ | Go to Step 4 | Go to Step 8 |
4 | Measure the voltage from the sunroof switch ignition positive voltage circuit and the sunroof switch ground circuit, at the sunroof switch assembly harness connector. Does the voltage measure near the specified value? | B+ | Go to Step 5 | Go to Step 15 |
5 |
Does the test lamp illuminate? | -- | Go to Step 18 | Go to Step 6 |
6 |
Does the test lamp illuminate? | -- | Go to Step 14 | Go to Step 7 |
7 | Test both sunroof motor open and close control circuits 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 20 | Go to Step 13 |
8 | Test the ignition positive voltage circuit 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 20 | Go to Step 9 |
9 |
Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 17 |
10 | Connect a test lamp between the P/W relay control circuit and the P/W relay ground circuit. Does the test lamp illuminate? | -- | Go to Step 11 | Go to Step 17 |
11 | Connect a test lamp between the P/W relay supply voltage circuit and the P/W relay ground circuit. Does the test lamp illuminate? | -- | Go to Step 12 | Go to Step 17 |
12 | Inspect for poor connection at the P/W relay. 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 20 | Go to Step 16 |
13 | Inspect for poor connections at the sunroof switch assembly. 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 20 | Go to Step 18 |
14 | Inspect for poor connections at 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 20 | Go to Step 19 |
15 | Repair an open in the ground circuit between the sunroof switch assembly and the splice. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- |
16 | Replace the P/W relay. Did you complete the replacement? | -- | Go to Step 20 | -- |
17 | Replace the fuse block-instrument panel. Refer to fuse block-instrument panel replacement in Wiring Systems. Did you complete the replacement? | -- | Go to Step 20 | -- |
18 | Replace the courtesy/reading lamp assembly that contains the sunroof switch assembly. Refer to Sunroof Switch Replacement . Did you complete the replacement? | -- | Go to Step 20 | -- |
19 | Replace the sunroof motor. Refer to Sunroof Motor/Actuator Replacement . Did you complete the replacement? | -- | Go to Step 20 | -- |
20 |
Did you correct the condition? | -- | System OK | Go to Step 2 |
