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

Ignition voltage is applied to the sunroof switch via the MIRROR/SUNROOF fuse. The sunroof switch provides a voltage signal to the sunroof control module. The sunroof control module then applies ground and voltage to the motor control circuits according to the sunroof direction selected. When the sunroof reaches the end of it's travel, a limit switch is engaged and a signal is sent to the sunroof control module to stop the motor.

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 (Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Circuit/System Testing
Sunroof System Test

1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 3 and ground.

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

3. Ignition OFF, connect the harness connector at the sunroof switch. Disconnect the harness connector at the sunroof control module.
4. Test for less than 1Ohms between the ground circuit terminal 4 and ground.

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

5. Ignition ON, connect a test lamp between the signal circuit terminal 1 and ground.
6. Observe the test light while applying the sunroof switch in the closed position. The test lamp should turn ON and OFF when applying and releasing the switch.

• If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the sunroof switch.
• If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof switch.

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

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

8. Ignition OFF, connect the harness connector at the sunroof control module. Disconnect the X2 harness connector at the sunroof motor.
9. Test for less than 5.0 Ohms between the low reference circuit terminal 1 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit test normal, replace the sunroof control module.

10. Test for less than 5.0 Ohms between the low reference circuit terminal 2 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit test normal, replace the sunroof control module.

11. Ignition ON, test for 3-12 V between the signal circuit terminal 3 and ground.

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

12. Ignition OFF, disconnect the X1 harness connector at the sunroof motor.
13. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2.
14. Ignition ON, observe the test light while cycling the sunroof switch in both directions. The test lamp should turn ON and OFF when applying and releasing the sunroof switch.

• If the test lamp does not turn ON and OFF while applying the switch in both directions. Test both control circuits for a short to voltage, short to ground or an open/high resistance, If all circuits test normal, replace the sunroof control module.

15. If all circuits test normal, replace the sunroof motor.

Repair Instructions

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

* Sunroof Module Assembly Replacement (Service and Repair)
* Sunroof Switch Replacement (Service and Repair)