Sunroof / Moonroof: Description and Operation

Circuit Operation

Power Sunroof System Components
The power sunroof system consists of the following components:
- Sunroof control module
- Sunroof switch
- Sunroof motor
- Sunroof glass, tilt/slide style, with glass sliding between the headliner and roof
- Sunshade
- Rail and track assembly upon which the sunroof glass rides
- Power supply for the sunroof control module:
- Sunroof control module logic circuitry:
- Short wheelbase: RAP supply voltage is supplied and controlled directly from the Body Control Module (BCM) for the Retained Accessory Power (RAP) function.
- Long wheelbase: VENT WDO Relay 20 A fuse supplies the voltage through the RAP relay, that is controlled by the BCM, for the RAP function.
- Ground from G302

Power Sunroof Operation
The sunroof control module has two power circuits; the Sunroof 20 A fuse and the RAP supply voltage. The Sunroof 20 A fuse is hot at all times suppling battery positive voltage for the operation of the sunroof motor control circuits. The RAP supply voltage is for the sunroof control module logic circuitry and is controlled from, or by the BCM, depending on the wiring configuration. The power sunroof will operate with the ignition switch turned to Accessory or RUN suppling RAP supply voltage. Once the ignition switch is turned to OFF the sunroof will continue to operate until any door is open or when the Retained Accessory Power (RAP) has timed out. For a description and operation of the RAP operation, refer to Retained Accessory Power (RAP) Description and Operation in Retained Accessory Power.

Use the rocker type sunroof switch to command the sunroof to :
- Express Open
- Close
- Vent

Pressing the sunroof switch rearward, the sunroof glass will slide from:
- Closed position to the vent position.
- Vent position to the closed position.

Pressing the sunroof switch forward, the sunroof glass will slide from:
- Closed position to the open position.
- Open position to the closed position.