Circuit/System Description
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The sunroof control module supplies each of the sunroof switch signal circuits with a 12 V reference. When a switch is pressed the signal circuit is pulled low signaling the sunroof open or close request. The module determines the motor direction based on inputs received from the sunroof switch. When the module reverses the polarity of the applied voltage, the motor reverses direction. A sunroof enable signal is supplied to the sunroof control module by the BCM. B+ is applied to the sunroof control module via the S/ROOF fuse.