Sunroof / Moonroof: Description and Operation
Sunroof Description and Operation
Power Sunroof System Components
The Power Sunroof System consists of the following components:
* Sunroof control module
* Sunroof switch
* Rail and track assembly upon which the sunroof glass rides
* S/ROOF/SUNSHADE Fuse 30 A
* Body control module (BCM)
Power and Grounds
Battery positive voltage is supplied at all times to the sunroof control module from the 30 A S/ROOF/SUNSHADE Fuse located in the underhood fuse block. Ground is supplied to the sunroof control module through the body ground circuit G402.
Ground is supplied to the sunroof switch through the body ground circuit G402.
Power Sunroof Operation
The Power Sunroof System will operate only with the ignition turned to the RUN or Accessory positions, this allows for retained accessory power (RAP) control of the sunroof through the body control module (BCM). With the ignition in the run or accessory positions, the BCM supplies the sunroof with ignition voltage which allows sunroof operation. Once the ignition switch is turned to OFF the sunroof will continue to operate until any door is opened or when the RAP timer reaches its shut-off limit. For a description and operation of the RAP operation, refer to Retained Accessory Power Description and Operation Retained Accessory Power.
The rear sunroof is a fixed glass and does not open. The front and rear sunshades will have to be manually opened or closed.
Sunroof Switch
The sunroof switch assembly is located on the headliner above the rearview mirror and is used to command the sunroof to open and close.
Sunroof Motor
The sunroof control module assembly has a bi-directional motor. The motor ground is removed when the sunroof reaches the soft stop end of travel position. This is based on the learned position that was performed during the initialization process. The internal hall effect sensors within the sunroof control module assembly creates pulses that are counted by the modules until the end of travel position is reached.