To Vent Open
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
To open the power sunroof to the vent position from the closed position, press and hold the sunroof switch forward. This will apply an input to the sunroof actuator motor from the sunroof switch close contacts through the sunroof switch close signal circuit. The sunroof switch close input to the sunroof actuator motor needs be constant, switch pressed, to allow the sunroof actuator motor to control the motor to tilt the rear of the sunroof window upward to the vent position.