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 each of the sunroof switch signal circuits with a 12 V 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 via the S/ROOF fuse.
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 (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)
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 control module.
2. Test for less than 5.0 ohm between the ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 6 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the sunroof control module.
4. 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 an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power Malfunction (Retained Accessory Power Malfunction).
5. Ignition OFF, connect the harness connector at the sunroof control module.
6. Disconnect the harness connector at the sunroof switch.
7. Test for less than 5.0 ohm between the low reference circuit terminal B and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance.
Important: Apply ground to the motor for no longer than 2 seconds at a time or the motor could be damaged.
When performing the following tests, make sure that the sunroof is not at its end of travel position by switching the grounded jumper to the other signal circuit if the sunroof did not move in one direction.
8. Ignition ON, momentarily install a 10A fused jumper wire between the signal circuit terminal E 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 control module.
9. Momentarily install a 10A fused jumper wire between the signal circuit terminal D 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 control module.
10. If all circuits test normal, test or replace the sunroof switch.
Component Testing
1. With the ignition OFF, disconnect the harness connector at the sunroof switch.
2. Test for infinite resistance between the switch terminals listed below and the low reference terminal B with the switch in the neutral position.
* Roof open terminal E
* Roof close terminal D
• If not the specified value, replace the sunroof switch.
Important: If the switch tests open in any switch position other than Off, test the sunroof switch signal circuits for a short to voltage before replacing the switch.
3. Test for less than 5.0 ohm between the switch terminals listed below the low reference terminal B with the switch in the appropriate position.
* Roof open terminal E
* Roof close terminal D
• 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 (Service and Repair)
* Control Module References (Programming and Relearning) for sunroof motor/actuator replacement, setup, and programming