Circuit/System Description

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The sunroof motor is located between the headliner and the roof structure, while the sunroof switch is located above the rearview mirror. When the ignition switch is in the ON or ACC positions, battery voltage from the RAP relay is applied through the S/ROOF fuse and the accessory voltage circuit to the sunroof motor actuator. The sunroof motor supplies voltage to the sunroof switch through the sunroof open and close signal circuits. It also supplies ground to the switch through the sunroof switch low reference circuit. When the sunroof open or close switch is pressed, ground is applied through the switch contacts and the signal circuit to the sunroof motor. It then internally applies battery voltage and ground to the appropriate circuits of the reversible motor in order to move the sunroof glass panel to the appropriate open, close, or vent position.