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
B+ is always present at the sunroof control module. When the ignition switch is in the ON position or when retained accessory power (RAP) is active, voltage is applied to the sunroof control module via the RAP relay and the SUNROOF fuse. The sunroof control module determines the sunroof motor direction based on inputs received from the sunroof switch. The sunroof control module supplies each of the sunroof switch signal circuits with a 12 V reference. When the switch is pressed the signal circuit is pulled low signaling the roof open or close request. The sunroof control module controls the sunroof motor direction by changing the polarity of the applied voltage.
Diagnostic Aids
There are three grounds at the sunroof control module. Any one ground circuit with an open/high resistance condition will cause the sunroof to be inoperative. If ground circuits on the sunroof control module terminals 4 or 12 are open, the low reference at the switch will measure less than 20 ohms. If the ground circuit on terminal 13 is open, the low reference at the switch will measure open.
Reference Information
Schematic Reference
Sunroof Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (MN5)
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 Verification
1. With the sunroof in the closed position, press and hold 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 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.
Circuit/System Testing
Note: Because of the accessibility of the sunroof switch, perform the sunroof switch component test before beginning the Circuit/System Testing.
Power Sunroof Malfunction
1. Ignition OFF, disconnect the harness connector at the sunroof control module.
2. Test for less than 5.0 ohms between the ground circuit terminal 4 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Test for less than 5.0 ohms between the ground circuit terminal 12 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
4. Test for less than 5.0 ohms between the ground circuit terminal 13 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
5. Verify that a test lamp illuminates between the B+ circuit terminal 1 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 sunroof control module.
6. 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. If the circuit tests normal, refer to Retained Accessory Power Malfunction Retained Accessory Power Malfunction.
7. Ignition OFF, connect the harness connector at the sunroof control module.
8. Disconnect the harness connector at the sunroof switch.
9. Test for less than 20 ohms 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.
10. Ignition ON, at the sunroof switch harness connector, test for B+ between the following signal circuit terminals and ground:
* Sunroof switch open signal terminal 1
* Sunroof switch open vent signal terminal 2
* Sunroof switch express signal terminal 4
• If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module.
11. If all circuits test normal, test or replace the sunroof switch.
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 3 A fused jumper wires between both signal circuits listed below and ground for less than 1 second. The sunroof should express open.
* Sunroof switch open signal terminal 1
* Sunroof switch express signal terminal 4
• If the sunroof did not express open, test the signal circuit terminal 4 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the sunroof control module.
3. If all circuits test normal, test or replace the sunroof switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the sunroof switch.
2. Test for infinite resistance between the sunroof switch terminals listed below and the low reference terminal 3 with the switch in the neutral position:
* Sunroof switch open signal terminal 1
* Sunroof switch open vent signal terminal 2
* Sunroof switch express signal terminal 4
• If less than the specified range, replace the sunroof switch.
Note: 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 30 ohms between the sunroof switch terminals listed below and the low reference terminal 3 while pressing the appropriate switch.
* Sunroof switch open signal terminal 1
* Sunroof switch close signal terminal 1
* Sunroof switch open vent signal terminal 2
* Sunroof switch close vent signal terminal 2
* Sunroof switch express signal terminal 4
• If greater than the specified range, replace the sunroof switch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Sunroof Switch Replacement Service and Repair
* Sunroof Motor/Actuator Replacement Service and Repair
* Control Module References Programming and Relearning for sunroof control module replacement, programming and setup