Operation CHARM: Car repair manuals for everyone.

To Vent Open

Opening the sunroof glass, to the vent position, can be done when it is between fully closed and full vent. Press and hold the sunroof switch upward. This will apply the sunroof switch low reference circuit to the sunroof switch open vent signal circuit. Holding the sunroof switch in the vent position will cause the sunroof switch open vent signal circuit (12 volt reference) input to be pulled to 0 volts. The constant low input to the sunroof module indicates a vent request. Once the vent request has been initiated the sunroof module will drive the motor in the closed direction (to vent position) until the sunroof motion is terminated by either:
- Motor stall is sensed because the sunroof has reached its limit of travel.
- Releasing the sunroof switch.