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Power Sunroof Malfunction (Sedan or Wagon)




Power Sunroof Malfunction (Sedan or Wagon)

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 Instructionsprovides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

Ignition voltage is supplied to the sunroof control and sunroof shade modules by the BCM. B+ is applied to the sunroof control and sunroof shade modules via the S/ROOF or SUNROOF fuse. The sunroof control and sunroof shade modules supply each of the switch signal circuits with a voltage reference. When a switch is pressed the signal circuit is pulled low signaling the sunroof or sunshade open or close request. The modules determine the motor direction based on inputs received from the switches. When the modules reverse the polarity of the applied voltage, the motors reverse direction. The sunroof shade module contains the logic for opening and closing the sunshade based on Serial Data from the sunroof control module.

The sunroof shade module contains the logic for opening and closing the sunshade based on Serial Data received from the sunroof control module. The sunroof shade module internally applies voltage and ground to the appropriate circuits of the reversible sunshade motor in order to move the sunshade panel to the open or closed positions.

Diagnostic Aids

If the sunroof and/or sunshade are experiencing an intermittent inoperative condition, check the sunroof switch ground circuit for an open condition. 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 is removed, and the sunroof and/or sunshade 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 (Coupe) Sunroof Description and Operation (Coupe)Sunroof Description and Operation (Sedan or Wagon) Sunroof Description and Operation (Sedan or Wagon)
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 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 sunshade in the closed position, press the sunshade open switch. The sunshade should open.

If the sunshade does not open, refer to Power Sunshade Malfunction.

4. With the sunshade in the open position, press the sunshade close switch. The sunshade should close.

If the sunshade does not close, refer to Power Sunshade Malfunction.

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 1 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 2 and ground.

If greater than the specified range, test the ground circuit for an open/high resistance.

4. Verify that 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. the circuit tests normal and the B+ circuit fuse is open, replace the sunroof control module.

5. 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 an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power Malfunction Retained Accessory Power Malfunction.

6. Test for 10-40 Hz between the serial data circuit terminal 7 and ground.

If less than the specified range, test the serial data circuit for a short to ground, a short to voltage, or an open/high resistance. If the circuit tests normal, replace the sunroof shade module.

7. Test for 50-200 Hz between the serial data circuit terminal 7 and ground while operating the sunroof in the open direction.

If not within the specified range, replace the sunroof shade module.

8. Ignition OFF, connect the harness connector at the sunroof control module.
9. Disconnect the harness connector at the sunroof switch.
10. Test for less than 5.0 Ohms between the ground circuit terminal B and ground.

If greater than the specified range, test the ground circuit for an open/high resistance.

Note: Apply ground to the module for no longer than 2 seconds at a time or the module 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.

11. Ignition ON, momentarily install a 10 A 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 tests normal, replace the sunroof control module.

12. Momentarily install a 10 A 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 tests normal, replace the sunroof control module.

13. If all circuits test normal, test or replace the sunroof switch.

Power Sunshade Malfunction
1. Ignition OFF, disconnect the harness connector at the sunroof shade module.
2. Test for less than 5.0 Ohms between the ground circuit terminal 1 and ground.

If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that 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. the circuit tests normal and the B+ circuit fuse is open, replace the sunroof shade module.

4. 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 an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power Malfunction Retained Accessory Power Malfunction.

5. Test for 10-40 Hz between the serial data circuit terminal 7 and ground.

If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module.

6. Test for 50-200 Hz between the serial data circuit terminal 7 and ground while operating the sunroof in the open direction.

If not within the specified range, replace the sunroof control module.

7. Ignition OFF, connect the harness connector at the sunroof shade module.
8. Disconnect the harness connector at the sunroof shade switch.
9. Test for less than 5.0 Ohms between the ground circuit terminal B and ground.

If greater than the specified range, test the ground circuit for an open/high resistance.

Note: Apply ground to the module for no longer than 2 seconds at a time or the module could be damaged.

When performing the following tests, make sure that the sunshade is not at its end of travel position by switching the grounded jumper to the other signal circuit if the sunshade did not move in one direction.

10. Ignition ON, momentarily install a 10 A fused jumper wire between the signal circuit terminal D and ground. The sunshade should move.

If the sunshade does not move, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit tests normal, replace the sunroof shade module.

11. Momentarily install a 10 A fused jumper wire between the signal circuit terminal E and ground. The sunshade should move.

If the sunshade does not move, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit tests normal, replace the sunroof shade module.

12. If all circuits test normal, test or replace the sunroof shade switch.

Component Testing

1. With the ignition OFF, disconnect the harness connector at the sunroof or sunroof shade switch.
2. Test for infinite resistance between the switch terminals listed below and the ground terminal B with the switch in the neutral position.

* Open terminal D
* Close terminal E

If not the specified value, replace the appropriate switch.

Note: If the switch tests open in any switch position other than Off, test the switch signal circuits for a short to voltage before replacing the switch.

3. Test for less than 5 Ohms between the switch terminals listed below and the ground terminal B with the switch in the appropriate position.

* Open terminal D
* Close terminal E

If greater than the specified range, replace the appropriate switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Sunroof Switch Replacement Service and Repair
* Sunroof Sunshade Switch Replacement Sunroof Sunshade Switch Replacement
* Control Module References Control Module Referencesfor Sunroof Control Module or Sunroof Shade Module replacement, programming and setup