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Cars & Trucks Master
Re: My sunroof is slow opening up
Depending on age, I'd guess it needs some lubrication both in the motor drive and the guide rails. I am partial to a silicone grease that is long lasting and somewhat water resistant. The drive motor is something else.
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Sunroof Description and Operation (One Connector System)
This diagnostic procedure is to be used for the 1 connector Sunroof System that combines the sunroof control module with the sunroof motor/actuator.
The Sunroof System consists of the following components:
• BATT MAIN 2 Fuse 50 A
• Body control module (BCM)
• RAP relay
• S/Roof Fuse 20 A
• Sunroof module (includes sunroof motor/actuator)
• Sunroof switch
The Sunroof System is controlled by the sunroof switch and the sunroof motor/actuator assembly.
When the ignition is turned to RUN or ACCESSORY, or when the retained accessory power (RAP) system is active, the body control module (BCM) applies a ground to the RAP relay in the instrument panel (I/P) fuse block. This activates the RAP relay and allows battery positive voltage to be applied through the SUNROOF Fuse to the sunroof module. Ground for the sunroof module is supplied from G302.
The sunroof can be placed in 3 preset positions:
When the sunroof switch is placed in the OPEN position, a ground is applied from the sunroof switch low reference circuit , through the sunroof switch and to the sunroof switch open signal circuit. The sunroof motor/actuator then applies voltage to the sunroof motor open control circuit and applies a ground to the sunroof motor close circuit. The sunroof motor then opens the sunroof to the full open position.
When the sunroof switch is placed in the VENT position, a ground is applied from the sunroof switch low reference circuit , through the sunroof switch and to the sunroof switch open signal circuit. The sunroof module then applies voltage to the sunroof motor open control circuit and applies a ground to the sunroof motor close circuit. The sunroof motor then opens the sunroof to the VENT position.
When the sunroof switch is placed and held in the CLOSED position, a ground is applied from the sunroof switch low reference circuit , through the sunroof switch and to the sunroof switch close signal circuit. The sunroof module then applies voltage to the sunroof motor close control circuit and applies a ground to the sunroof motor open circuit. The sunroof motor then closes the sunroof.
The sunroof can be placed in any preferred open position when:
• The sunroof is in the fully opened position by pressing and holding the sunroof switch in the CLOSE position until the panel has reached the desired position then release the CLOSE switch in order to stop the sunroof
• The sunroof is opening, it can be stopped by momentarily pressing either side of the switch.
The sunroof control module, sun roof actuator, and the sunroof motor are integral parts of the sunroof module assembly and are not service separately.
Your best bet , take it to a qualified repair shop or buick dealer .
This could be a couple of problems. Check to see that there is nothing in the sunroof track. Believe it or NOT you may even have a worn sunroof motor. Over time it can drag down needing replaced. Need more info...how old is the Vehicle & does the sunroof open real slow in reverse direction. Are you able to close it helping along with your hand and the sunroof motor as well?
Always check ALL the fuse that supply power to the BC1. ... the heated rear windowand optional heated front screen until the voltage level exceeds 12.2 ... Convenience Opening and Closing of windows and sunroof ..... intermittent wipe, slow, and fastspeeds. .... Road speed has no influence over wiper speed 1 (Slow).
If you remove any gear that is coupling it to the motor you should be able to slide it back to where you want. I would put gear back just to hold it in place and keep it from moving. But you do have to replace that gearbox for future operation.