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 module determines the sunroof motor direction based on inputs received from the overhead console sunroof switches. The module supplies each of the sunroof switch signal circuits with a 5-volt reference. When the switch is pressed the signal circuit is pulled low signaling the roof open or closed request. When the ignition switch is in the ON position or when retained accessory power (RAP) is active, voltage is applied to the sunroof module via the RAP relay and the S/ROOF fuse. The sunroof module controls the sunroof motor direction by changing the polarity of the applied voltage. The sunroof module remembers the sunroof position whenever the ignition switch is turned to the OFF position. The limit switch is used as an input to the sunroof module to indicate that the glass is fully closed, or in the soft stop positions. The limit switch is grounded only when the sunroof glass is in the fully closed or soft stop positions, otherwise it is open.
Diagnostic Aids
If the sunroof is experiencing an intermittent inoperative condition, check the sunroof switch ground circuit for an open. If the sunroof switch ground circuit is open, the switch may take a redundant path to ground through the switch illumination circuit. When the lights are turned On, the redundant path to ground is removed, and the sunroof will become inoperative.
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)
Scan Tool Reference
Programming and Relearning (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.
• If the sunroof does not open, refer to Power Sunroof Malfunction.
2. With the sunroof in the open position, press the sunroof close switch. The sunroof should close.
• If the sunroof does not close, refer to Power Sunroof Malfunction.
3. With the sunroof in the closed position, press the sunroof vent open switch. The sunroof should open to the vent position.
• If the sunroof does not open to the vent position, refer to Power Sunroof Malfunction.
4. With the sunroof in the vent open position, press the sunroof vent close switch. The sunroof should close.
• If the sunroof does not close, refer to Power Sunroof Malfunction.
5. With the sunroof in the closed position, momentarily press the sunroof open switch to the second detente. The sunroof should express open.
• If the sunroof does not express open, refer to Power Sunroof Express Feature Malfunction.
6. If all sunroof functions move in the commanded directions, but the roof does not find the closed position, refer to Power Sunroof Motor Limit Switch Test.
Circuit/System Testing
Power Sunroof Malfunction
1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Test for less than 15 ohms of resistance between the ground circuit terminal 5 and ground.
• If greater than the specified range, test the ground circuits listed below for an open/high resistance. If the circuits test normal, replace the sunroof control module.
* Sunroof switch terminal 5
* Sunroof control module harness connector X1 terminal D
3. Connect a 3A fused jumper wire between the signal circuit listed below and ground. The roof should be inoperative in at least one or more directions.
* Sunroof open terminal 8
* Sunroof close terminal 2
* Vent open terminal 4
* Vent close terminal 6
• If the roof moved in all directions, replace the sunroof switch.
4. Disconnect the X1 harness connector at the sunroof control module.
5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
6. Ignition OFF, connect the X1 harness connector at the sunroof control module.
7. Ignition ON, at the sunroof switch harness connector, test for 4.8-5.2 volts between the signal circuits listed below and ground.
* Express vent terminal 1
* Sunroof close terminal 2
* Vent open terminal 4
* Vent close terminal 6
* Sunroof express terminal 7
* Sunroof open terminal 8
• 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.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the sunroof control module.
8. Ignition OFF, connect the harness connector at the sunroof switch.
9. Disconnect the X2 harness connector at the sunroof motor.
10. Connect a test lamp between the control circuit terminals A and B.
11. Press and release any one of the sunroof switches. The test lamp should illuminate.
• If the test lamp does not illuminate, test both control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the sunroof control module.
12. If all circuits test normal, test or replace the sunroof motor.
Power Sunroof Express Feature Malfunction
1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Ignition ON, with the sunroof in the closed position, connect a 3A fused jumper wires between both signal circuits listed below and ground for less than 1 second. The sunroof should express open.
* Terminal 7
* Terminal 8
• If the sunroof did not express open, test the signal circuit for a short to voltage or an open high resistance. If the circuit tests normal, replace the sunroof motor/actuator.
3. Ignition ON, with the sunroof in the closed position, connect a 3A fused jumper wire between both signal circuits listed below and ground for less than 1 second. The roof should express open to the vent position.
* Terminal 1
* Terminal 4
• If the roof did not express open to the vent position, test the signal circuit for a short to voltage or an open high resistance. If the circuit tests normal, replace the sunroof motor/actuator.
4. If all circuits test normal, test or replace the sunroof switch.
Power Sunroof Motor Limit Switch Test
1. Ignition OFF, disconnect the X1 harness connector at the sunroof motor.
2. Test for less than 5 ohms of resistance between the low reference circuit terminal 3 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the sunroof control module.
3. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 1 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.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the sunroof control module.
4. If all circuits test normal, test or replace the sunroof motor.
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 low reference terminal 5 with the switch in the open position.
* Vent express terminal 1
* Roof close terminal 2
* Vent open terminal 4
* Vent close terminal 6
* Roof express terminal 7
* Roof open terminal 8
• 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 switch terminals listed below and the low reference terminal 5 while pressing the appropriate switch.
* Vent express terminal 1
* Roof close terminal 2
* Vent open terminal 4
* Vent close terminal 6
* Roof express terminal 7
* Roof open terminal 8
• If greater than the specified range, replace the sunroof switch.
Sunroof Motor Limit Switch
1. Ignition ON, press the sunroof switch to move the sunroof to the full closed position.
2. Ignition OFF, disconnect the X1 harness connector at the sunroof motor.
3. Test for less than 5 ohms between the signal terminal 1 and the low reference terminal 3.
• If greater than the specified range, replace the sunroof motor.
4. Ignition ON, press the sunroof switch to move the sunroof to the open or vent position.
5. Ignition OFF, test for infinite resistance between the signal terminal 1 and the low reference terminal 3.
• If not the specified value, replace the sunroof motor.
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)
* Programming and Relearning (Programming and Relearning) for sunroof control module replacement, setup, and programming