2010 GMC Terrain Owner's Manual - Page 22

1-16 Keys, Doors and Windows Automatic Dimming Mirror Operation Automatic dimming reduces the glare from the headlamps of the vehicle behind you. The dimming feature comes on and the indicator light comes on each time the vehicle is started. Interior Mirrors Automatic Dimming Rearview Mirror The vehicle may have an automatic dimming inside rearview mirror. Vehicles with OnStar® have three additional control buttons located at the bottom of the mirror. See your dealer/retailer for more information on the system and how to subscribe to OnStar. See OnStar® System on page 4‑41 for more information about the services OnStar provides. Windows { WARNING Leaving children, helpless adults, or pets in a vehicle with the windows closed is dangerous. They can be overcome by the extreme heat and suffer permanent injuries or even death from heat stroke. Never leave a child, a helpless adult, or a pet alone in a vehicle, especially with the windows closed in warm or hot weather. Cleaning the Mirror Do not spray glass cleaner directly on the mirror. Use a soft towel dampened with water. O : Press to turn automatic dimming on or off. If the vehicle has a rear vision camera (RVC) the O button for turning the automatic dimming feature on or off will not be available. See Rear Vision Camera (RVC) on page 8‑50 for more information.