Open to Vent
WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Press and hold the rearward portion of the sunroof switch, firmly to the first detent, the vent position. The sunroof switch will apply the accessory voltage through to the sunroof motor open control circuit to the sunroof actuator motor. The sunroof switch will also apply the ground circuit through to the sunroof motor close control circuit to the sunroof actuator motor. The rear edge of the sunroof window will raise upward, soft stopping at the vent position. As the sunroof window reaches the vent position, the sunroof limit switch opens, opening the ground path being supplied to the sunroof switch, stopping the sunroof actuator motor.