For 1990-2009 cars

### Diagnostic Aids

If the sunroof is experiencing an intermittent inoperative condition, check the sunroof switch ground circuit for an open. If the sunroof switch ground circuit is open, the switch may take a redundant path to ground through the switch illumination circuit. When the lights are turned On, the redundant path to ground is removed and the sunroof will become inoperative.

If the sunroof close vent switch signal circuit is found to be short to voltage, the sunroof switch will most likely be open.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step tests the integrity sunroof vent close switch. If the sunroof closes from the vent position when performing this test, the switch is at fault. If the fuse in the jumper wire opens when you perform this test, a short to battery voltage may have occurred.

Step | Action | Value | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Sunroof Schematics Connector End View: Sunroof Connector End Views DEFINITION: The sunroof will not close from the vent position using the vent close switch. However, the roof will close from the vent position by using the roof close switch or roof express close switch. All other sunroof functions operate OK.
1 | Have you conducted Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Attempt to operate the power sunroof through its full range of vent functions in order to verify that the power sunroof does not close from the vent position. Does the power sunroof vent system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3
3 |

1. Disconnect the sunroof switch.
2. Turn ON the ignition, with the engine OFF.
3. Connect a 3-amp fused jumper wire between the sunroof vent close switch signal circuit of the sunroof switch connector and the ground circuit of the sunroof switch connector.

Did the power sunroof close from the vent position?

--

Go to Step 6

Go to Step 4

4 |

1. Disconnect the 3-amp fused jumper wire.
2. Measure the voltage from the vent close switch signal circuit of the switch connector to a good ground.

Does the voltage measure near the specified value?

B+

Go to Step 7

Go to Step 5

5 | Test the sunroof vent close switch signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Do you find and correct the condition? | -- | Go to Step 10 | Go to Step 7
6 | Inspect for poor connections at the harness connector of the sunroof switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Do you find and correct the condition? | -- | Go to Step 10 | Go to Step 8
7 | 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 . Do you find and correct the condition? | -- | Go to Step 10 | Go to Step 9
8 | Replace the sunroof switch. Refer to Sunroof Switch Replacement . Have you finished the replacement? | -- | Go to Step 10 | --
9 | Replace the sunroof control module. Refer to Control Module References to replace, set and program. Have you finished the replacement? | -- | Go to Step 10 | --
10 | Operate the system to verify the repair. Do you find and correct the condition? | -- | System OK | Go to Step 2