2011 Buick Lucern Owner's Manual - Page 156

To close the sunroof, press the front of the driver side switch to the second detent position, and release. To vent the sunroof press and hold the back of the passenger side switch until the vent reaches the desired position. Press the front of the passenger side switch to close the sunroof. If an object is in the path of the sunroof while it is closing, the anti-pinch feature will detect the object and stop the sunroof from closing at the point of the obstruction. The sunroof will then return to the full-open or vent position. Dirt and debris may collect on the sunroof seal or in the tracks that could cause an issue with sunroof operation, noise or plug the water drainage system. Periodically open the sunroof and remove any obstacles or loose debris. Wipe the sunroof seal and roof sealing area using a clean cloth, mild soap, and water. Do not remove grease from sunroof. 3-52