Sunroof Motor

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The sunroof has a bi-directional motor. When the sunroof motor is not operating both control circuits are grounded. When the sunroof motor drives the sunroof glass in the direction from the vent position to the open position, the following occurs:

Voltage is supplied to the sunroof motor open control circuit.
Ground is maintained to the sunroof motor close control circuit.

When the motor drives the sunroof glass in the direction from the open position to the vent position, the following occurs:

Voltage is supplied to the sunroof motor close control circuit.
Ground is maintained to the sunroof motor open control circuit.

The sunroof motor understands when it has driven the sunroof glass to the vent, close and full open positions based on the internal limit switches within the sunroof control module. The sunroof control module interprets the limit switch combinations and controls the sunroof motor to soft stop the sunroof glass at the positions. The sunroof control module is equipped with a timer circuit which stops the operation of the sunroof motor after 8 seconds.