Power Sunroof Malfunction

Power Sunroof Malfunction

Diagnostic Instructions

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



Circuit/System Description

The sunroof module supplies each of the sunroof switch signal circuits with a 12-volt reference. When a switch is pressed the signal circuit is pulled low signaling the sunroof open or close request. The motor determines the motor direction based on inputs received from the sunroof switch. When the motor reverses the polarity of the applied voltage, the motor reverses direction. Ignition voltage is supplied to the sunroof motor by the S/ROOF FRT/WPR. fuse. B+ is applied to the sunroof motor via the PWR S/ROOF fuse.


Reference Information
Schematic Reference

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

Component Connector End Views (Component Connector End Views)
Description and Operation

Sunroof Description and Operation (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 open.
2. With the sunroof in the open position, press the sunroof close switch. The sunroof should close.



Circuit/System Testing

Important: Because of the accessibility of the sunroof switch, perform the sunroof switch component test before beginning the Circuit/System Testing.



1. Ignition OFF, disconnect the harness connector at the sunroof motor.
2. Test for less than 5.0 ohm between the ground circuit terminal 7 and ground.

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

3. Verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the fuse and replace the sunroof motor.

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 8 and ground.

• If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power (RAP) Malfunction (Retained Accessory Power (RAP) Malfunction) .

5. Ignition OFF, connect the harness connector at the sunroof motor.
6. Disconnect the harness connector at the sunroof switch.
7. Test for less than 5.0 ohm between the ground circuit terminal A and ground.

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


Important: Apply ground to the module for no longer than 2 seconds at a time or the module could be damaged.


When performing the following tests, make sure that the sunroof or sunshade is not at its end of travel position by switching the grounded jumper to the other signal circuit if the sunroof or sunshade did not move in one direction.


8. Ignition ON, momentarily install a 10-amp fused jumper wire between the signal circuit terminal F and ground. The sunroof should move.

• If the sunroof does not move, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit test is normal, replace the sunroof motor.

9. Momentarily install a 10-amp fused jumper wire between the signal circuit terminal G and ground. The sunroof should move.

• If the sunroof does not move, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit test is normal, replace the sunroof motor.

10. If all circuits test normal, test or replace the sunroof switch.



Component Testing


Sunroof Switch
1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Test for infinite resistance between the switch terminals listed below and the ground circuit terminal A with the switch in the neutral position.

* Sunroof close terminal F
* Sunroof open terminal G


• If not the specified value, replace the sunroof switch.

3. Test for less than 5 ohms between the switch terminals listed below and the ground circuit terminal A with the switch in the appropriate position.

* Sunroof close terminal F
* Sunroof open terminal G


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




Repair Instructions

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

* Sunroof Switch Replacement (Service and Repair)
* Sunroof Motor/Actuator Replacement (Service and Repair)