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.
Diagnostic Fault Information
Circuit/System Description
The sunroof motor 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 sunroof motor module. The sunroof motor 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 (Component Connector End 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)
Scan Tool Reference
Control Module References (Control Module References) 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. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground.
* Sunroof switch low reference circuit terminal A
* Sunroof motor ground circuit terminal 1
• If greater than the specified range, test the following low reference/ground circuits for an open/high resistance. If the circuit tests normal, replace the sunroof motor.
3. Connect a 3A fused jumper wire between the following sunroof switch signal circuits and the low reference circuit terminal A. The roof should be inoperative in at least one or more directions.
* Sunroof switch open signal terminal G
* Sunroof switch close signal terminal F
• If the roof moved in all directions, replace the sunroof switch.
4. Ignition OFF, disconnect the harness connector at the sunroof motor.
5. Ignition OFF, test for less than 5 ohm 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 a test lamp illuminates between the B+ circuit terminal 6 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
7. Verify a test lamp illuminates between the RAP fuse supply voltage circuit terminal 3 and ground.
• If the test lamp does not illuminate, test the RAP fuse supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power (RAP) Malfunction (Retained Accessory Power (RAP) Malfunction).
8. Ignition OFF, connect the harness connector at the sunroof motor.
9. Ignition ON, test for 4.8-5.2 volts between the following sunroof switch signal circuits and ground.
* Sunroof switch open signal terminal G
* Sunroof switch close signal terminal F
• 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 motor.
• If greater then the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the sunroof motor.
10. If all circuits test normal, replace the sunroof motor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Test for infinite resistance between the following sunroof switch terminals and the low reference terminal A with the switch in the open position.
* Sunroof switch open signal terminal G
* Sunroof switch close signal terminal F
• If less than the specified range, 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 3 ohms between the following sunroof switch terminals and the low reference terminal A with the switch in the closed position.
* Sunroof switch open signal terminal G
* Sunroof switch close signal terminal F
• 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)
* Sunroof Motor/Actuator Replacement (Service and Repair)
* Control Module References (Control Module References) for sunroof control module replacement, setup, and programming