2012 Buick Regal Owner Manual - Page 54

2-20 Sunshade Keys, Doors, and Windows Safety Function If the sunroof has any resistance during automatic closing, it will immediately stop and reverse. To override the safety function, press and hold the close sunroof switch. The sunroof closes without the safety function. To stop the movement, release the switch. The sunshade is manually operated. Close or open the sunshade by sliding. When the sunroof is opened, the sunshade is always open.