2012 GMC Sierra Owner's Manual - Page 62

2-18 Keys, Doors, and Windows Interior Mirrors Manual Rearview Mirror To adjust the inside rearview mirror, hold the rearview mirror in the center and move it to view the area behind the vehicle. For vehicles with a manual rearview mirror, push the tab forward for daytime use and pull it for nighttime use to avoid glare from the headlamps from behind. Vehicles with OnStar® have three control buttons at the bottom of the mirror. See a dealer for more information about OnStar and how to subscribe to it. See OnStar Overview on page 14‑1. Automatic Dimming Rearview Mirror The vehicle may have an automatic dimming inside rearview mirror. To adjust the inside rearview mirror, hold the rearview mirror in the center and move it to view the area behind the vehicle. The automatic dimming rearview mirror will automatically reduce the glare from the headlamps from behind. The dimming feature comes on when the vehicle is started. If the vehicle has a RVC, the O button for turning the dimming feature on or off will not be available. Vehicles with OnStar have three additional control buttons for the OnStar system. See a dealer for more information about OnStar and how to subscribe to it. See OnStar Overview on page 14‑1. Cleaning the Mirror Do not spray glass cleaner directly on the mirror. Use a soft towel dampened with water. O (On/Off): Press to turn the dimming feature on or off. The vehicle may also have a Rear Vision Camera (RVC). See Rear Vision Camera (RVC) on page 9‑62 for more information.