2012 Buick LaCrosse Owner's Manual - Page 56

2-22 Keys, Doors, and Windows 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 the sunroof. Anti-Pinch Feature 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 and sunshade will then return to the open or vent position. To close the sunroof once the obstruction has been removed, refer to "Express-Open/Express-Close" earlier in this section. Dirt and debris may collect on the sunroof seal or in the track. This could cause issues with sunroof operation and noise. It could also plug the water drainage system.