Cobalt 2006-2008, G5 2007

Sunroof

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Power Sunroof



Diagnosis & Testing

If the power sunroof system fuse is open and a short to ground in the accessory voltage circuit is not detected, the fault could be a short to ground in one of the power sunroof control circuits. This would open the power sunroof system fuse when the sunroof switch is pressed.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located. Inspect for aftermarket devices which could affect the operation of the system. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Faulty electrical connections or wiring may be the cause of intermittent conditions.

Circuit Testing


Click image to see an enlarged view

Fig. Sunroof electronic schematic

  1. Disconnect the sunroof switch from the harness connector.
  2.  
  3. Turn the ignition switch to the ON position with the engine OFF.
  4.  
  5. Probe the accessory voltage circuit of the sunroof switch harness connector with a test lamp that is connected to a good ground. The test lamp should illuminate.
  6.  
  7. Connect a test lamp between the accessory voltage circuit and the ground circuit of the sunroof switch harness connector. The test lamp should illuminate.
  8.  
  9. Test the accessory voltage circuit of the sunroof switch for a short to ground or an open.
  10.  
  11. Probe each of the sunroof motor control circuits of the sunroof switch harness connector with a test lamp that is connected to battery positive voltage. See if the test lamp illuminates at any of the sunroof motor control circuits. Follow the circuit diagram.
  12.  
  13. Connect a test lamp between the sunroof motor close control circuit of the sunroof motor/actuator harness connector and a good ground. Press the sunroof switch to the close position for 3 seconds. The test lamp should illuminate.
  14.  
  15. Inspect for poor connections at the harness connector of the sunroof switch.
  16.  
  17. Inspect for poor connections at the harness connector of the sunroof motor/actuator.
  18.  
  19. Make necessary repairs and test for proper function of the sunroof assembly.
  20.  

Removal & Installation


Click image to see an enlarged view

Fig. Expanded view of the power sunroof

Motor
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the negative battery cable.
    NOTE
    It is only necessary to lower the headliner enough to gain access.

  4.  
  5. Lower the headliner.
    NOTE
    If the sunroof window is partially closed, remove the motor before moving the sunroof window forward.

  6.  
  7. Disconnect the motor/actuator harness from the sunroof module.
  8.  
  9. Disconnect the electrical connector from the sunroof motor/actuator.
  10.  
  11. Remove the sunroof motor/actuator bolts from the sunroof module.
  12.  
  13. Remove the sunroof motor/actuator from the sunroof module.
  14.  

To install:

Click image to see an enlarged view

Fig. Synchronize the sunroof motor/actuator with the sunroof guide mechanism


WARNING
Verify that both the sunroof motor/actuator and the sunroof guide mechanisms are in the vent position before you begin the synchronization procedure.

  1. Plug the motor/actuator into the harness and provide power.
  2.  
  3. Using the vehicle sunroof switch, position the motor/actuator in the vent detent mode only.
  4.  
  5. If the sunroof window is in the closed position, remove the sunroof window.
  6.  
  7. Verify that the sunroof guide mechanisms are fully forward and in the vent position.
  8.  
  9. Install the sunroof motor/actuator to the sunroof module.
  10.  
  11. Install the sunroof motor/actuator bolts. Tighten the bolts to 44 inch lbs. (5 Nm).
  12.  
  13. Install the sunroof window, if necessary.
  14.  
  15. Connect the electrical connector to the sunroof motor/actuator.
  16.  
  17. Secure the electrical harness to the sunroof module.
  18.  
  19. Connect the negative battery cable.
  20.  
  21. Operate the sunroof to verify proper function.
  22.  
  23. Raise the headliner back into position.
  24.  

Switch
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the negative battery cable.

    Click image to see an enlarged view

    Fig. Remove the bezel (1) from the headliner & the sunroof control switch (2) from the metal housing in the headliner

  4.  
  5. Use a small, flat-bladed tool in order to disengage the clips located at the sides of the switch bezel.
  6.  
  7. Remove the bezel (1) from the headliner.
  8.  
  9. Remove the sunroof control switch (2) from the metal housing in the headliner using a small, flat bladed tool at the front and rear of the switch.
  10.  
  11. Disconnect the electrical connector from the sunroof control switch.
  12.  

To install:

  1. Connect the harness to the switch.
  2.  
  3. Install the sunroof control switch (2) to the metal housing in the headliner.
  4.  
  5. Press the bezel to the headliner to engage the clips.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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