Power Sunroof Malfunction

Power Sunroof Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



Diagnostic Fault Information






Circuit/System Description

The sunroof control module supplies voltage to the sunroof switch through the sunroof switch open and close signal circuits. It also supplies ground to the sunroof switch through the switch low reference circuit. When the roof open or closed switch is pressed, ground is applied through the switch contacts and the appropriate signal circuit to the control module. The control module then internally applies battery positive voltage and ground to the appropriate circuits of the reversible power sunroof motor in order to move the sunroof glass panel to the vent, open or close position.


Reference Information
Schematic Reference

Sunroof Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Sunroof Description and Operation (Sunroof Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification

1. With the sunroof in the closed position, press the sunroof open switch. The sunroof should vent.
2. With the sunroof in the closed position, press and hold the sunroof open switch for 2 seconds. The sunroof should open.
3. With the sunroof in the open position, press the sunroof close switch. The sunroof should close.



Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Test for less than 5 ohms between the low reference circuit terminal B and ground.

• If greater than the specified range, test the following ground circuits for an open/high resistance. If the circuits test normal, replace the sunroof motor/actuator.


* Sunroof switch low reference circuit terminal B
* Sunroof motor/actuator harness connector ground circuit terminal 1

3. Connect a 3A fused jumper wire between the following sunroof switch signal circuits and ground. The roof should be inoperative in at least one or more directions.

* Terminal C sunroof switch open signal
* Terminal A sunroof switch close signal


• If the roof moved in all directions, replace the sunroof switch.

4. Ignition OFF, disconnect the harness connector at the sunroof control module.
5. Test for less than 5 ohms between the ground circuit terminal 1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

6. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.

• If the test lamp does not illuminate, repair the B+ circuit for a short to ground or an open/high resistance.

7. Verify that a test lamp illuminates between the ignition voltage circuit terminal 3 and ground.

• If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance.

8. Ignition OFF, connect the harness connector at the sunroof control module.
9. Ignition ON, test for B+ between the following sunroof switch signal circuits and ground.

* Sunroof switch open signal terminal C.
* Sunroof switch close signal terminal A.


• If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the sunroof control module.

10. If all circuit test normal, replace the sunroof control module.



Component Testing


Sunroof Switch
1. Ignition OFF, disconnect the harness connector sunroof switch.
2. Test for infinite resistance between the following sunroof switch signal terminals and the low reference circuit terminal B.

* Sunroof switch open signal circuit terminal C.
* Sunroof switch close signal circuit terminal A.


• If less than the specified value, replace the sunroof switch.

3. Test for less than 5 ohms between the sunroof switch open signal terminal D and the ground circuit terminal B with the switch in the closed position.

* Sunroof switch open signal circuit terminal C.
* Sunroof switch close signal circuit terminal A.


• If greater than the specified range, replace the sunroof switch.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Sunroof Switch Replacement (CF5) (Service and Repair)
* Control Module References (Programming and Relearning) for sunroof motor/actuator replacement, setup, and programming