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 electrical system uses a master/slave configuration utilizing a serial data based system for communication. The body control module (BCM) is designated as the master, while the sunroof control modules is configured as the slave.
As the system master, the BCM uses the serial data communication bus to enable or disable sunroof operation, communicate vehicle information to each controller, and request sunroof movement. The sunroof controller provide system status and diagnostic information to the BCM for diagnostic reporting and operational purposes. The control switches places a different resistor ladder network in the circuit depending on the function selected. The controllers analog to digital switch input reads the resulting voltage range and determines the function.
Diagnostic Aids
* The sunroof glass is controlled by an integrated motor/controller containing the motor, electronics, and position sensors. If the motor and sunroof mechanism get out of sync the sunroof may operate erratically. To re-synchronize the motor and sunroof mechanism, perform the Sunroof Motor/Actuator Initialization/Teach Process Testing and Inspection.
* The sunroof motor/controller provides obstacle/blockage detection. If the Sunroof Motor/Actuator Initialization/Teach Process Testing and Inspection is not carried out completely, the sunroof may stop and reverse slightly when it gets to the location where it needs to push down the windscreen. Make sure to complete the process.
Reference Information
Schematic Reference
Sunroof Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left
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. Ignition ON.
2. Verify the sunroof opens and closes when pressing the open and close sunroof switch.
• If the sunroof does not open or close
Refer to Circuit/System Testing.
• If the sunroof opens and closes
3. Verify the sunroof opens and closes to the vent position when pressing the open and close sunroof vent switch.
• If the sunroof does not open or close to the vent position
Refer to Circuit/System Testing - Vent Malfunction.
• If the sunroof opens and closes to the vent position
4. All OK.
Circuit/System Testing
Note: Perform the Switch Component Testing before beginning Circuit/System Testing.
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M69 Sunroof Motor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
• If test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the M69 Sunroof Motor.
• If the test lamp illuminates
4. Ignition ON.
5. Test for less than 1 V between the signal circuit terminals listed below and ground:
* Terminal 3 - M69 Sunroof Motor
* Terminal 5 - M69 Sunroof Motor
* Terminal 6 - M69 Sunroof Motor
• If 1 V or greater
Repair the short to voltage on the signal circuit.
• If less than 1 V
6. Ignition OFF.
7. Test for infinite resistance between the signal circuit terminals listed below and ground:
* Terminal 3 - M69 Sunroof Motor
* Terminal 5 - M69 Sunroof Motor
* Terminal 6 - M69 Sunroof Motor
• If less than infinite resistance
Repair the short to ground on the signal circuit
• If infinite resistance
8. Disconnect the harness connector at the S72 Sunroof Switch and the S88 Sunroof Tilt Switch.
9. Test for less than 5 ohms between the circuit terminals listed below:
* S72 Sunroof Switch terminal 1 and M69 Sunroof Motor terminal 3
* S72 Sunroof Switch terminal 4 and M69 Sunroof Motor terminal 5
* S88 Sunroof Tilt Switch terminal 1 and M69 Sunroof Motor terminal 3
* S88 Sunroof Tilt Switch terminal 4 and M69 Sunroof Motor terminal 6
• If greater than 5 ohms
Repair the open/high resistance in the circuit.
• If less than 5 ohms
10. Test or replace the M69 Sunroof Motor.
Vent Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S88 Sunroof Tilt Switch. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 1 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms , test or replace the M69 Sunroof Motor.
• If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Sunroof Tilt Switch parameter is Short to Battery.
• If not Short to Battery
1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor.
2. Test for infinite resistance between the signal circuit terminal 4 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the M69 Sunroof Motor.
• If Short to Battery
5. Install a 5 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 1.
6. Verify the scan tool Sunroof Tilt Switch parameter is Short to Ground.
• If not Short to Ground
1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor.
2. Test for less than 1 V between the signal circuit terminal 4 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the M69 Sunroof Motor.
• If Short to Ground
7. All OK.
Component Testing
Sunroof Switch - Static Test
1. Ignition OFF, disconnect the harness connector at the S72 Sunroof Switch.
2. Test for 3.3-4.0k ohms between the control terminal 4 and the low reference terminal 1.
• If not between 3.3-4.0k ohms
Replace the S72 Sunroof Switch.
• If between 3.3-4.0k ohms
3. Test for 390-480 ohms between the control terminal 4 and the low reference terminal 1 while pressing the open switch while pressing the open switch.
• If not between 390-480 ohms
Replace the S72 Sunroof Switch.
• If between 390-480 ohms
4. Test for 88-120 ohms between the control terminal 4 and the low reference terminal 1 while pressing the express open switch.
• If not between 88-120 ohms
Replace the S72 Sunroof Switch.
• If between 88-120 ohms
5. Test for 1.6-2.0k ohms between the control terminal 4 and the low reference terminal 1 while pressing the close switch.
• If not between 1.6-2.0k ohms
Replace the S72 Sunroof Switch.
• If between 1.6-2.0k ohms
6. Test for 830-1030 ohms between the control terminal 4 and the low reference terminal 1 while pressing the express close switch.
• If not between 830-1030 ohms
Replace the S72 Sunroof Switch.
• If between 830-1030 ohms
7. All OK
Sunroof Ventilation Switch - Static Test
1. Ignition OFF, disconnect the harness connector at the S88 Sunroof Tilt Switch.
2. Test for 830-1030 ohms between the control terminal 4 and the low reference terminal 1.
• If not between 830-1030 ohms
Replace the S88 Sunroof Tilt Switch.
• If between 830-1030 ohms
3. Test for 88-120 ohms between the control terminal 4 and the low reference terminal 1 while pressing the open switch.
• If not between 88-120 ohms
Replace the S88 Sunroof Tilt Switch.
• If between 88-120 ohms
4. Test for 390-480 ohms between the control terminal 4 and the ground terminal 1 while pressing the close switch.
• If not between 390-480 ohms
Replace the S88 Sunroof Tilt Switch.
• If between 390-480 ohms
5. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Sunroof Switch Replacement Sunroof Switch Replacement
* Sunroof Module Assembly Replacement Service and Repair
* Control Module References Control Module References for sunroof/sunshade motor/actuator replacement, programming and setup