Sunroof Control Module
WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The sunroof control module has a bi-directional motor. The sunroof motor understands when it has driven the sunroof glass to the vent, close and full open positions based on the internal hall effect sensors within the sunroof control module. The sunroof control module interprets the hall effect sensor combinations and controls the sunroof motor to soft stop the sunroof glass at the positions.