2003 Buick Regal Owner's Manual - Page 104

Your vehicle may be equipped with an express-open sunroof. It includes a sliding glass panel and a sunshade. The switch to open the sunroof is located overhead on the headliner. VENT: To raise the sunroof to the vent position only, push and hold the front of the switch until the sunroof glass stops. You will need to open the sunshade by hand. To close the sunroof from the vent position, push and hold the rear of the switch until the sunroof glass closes. OpenExpress Open: To open the sunroof, push the rear of the switch once. The sunroof and sunshade will open by themselves. This is the express-open feature. To close the sunroof, push and hold the front of the switch until the sunroof motor stops. The sunshade can only be closed by hand. The switch works only when the ignition is on or when retained accessory power is active. See "Retained Accessory Power" in Ignition Positions on page 2-18. 2-37