GMC Sierra Owners Manual
Automatic Dimming Rearview Mirror
The vehicle may have an automatic dimming inside rearview mirror.
Automatic dimming reduces the glare from the headlamps of the vehicle behind you. The dimming feature comes on and the indicator light illuminates each time the ignition is turned to start.
(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 9‑68 for more information.
If the vehicle has a RVC, the 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 your dealer for more information about OnStar and how to subscribe to it. See OnStar Overview on page 14‑1 for more information.
Cleaning the Mirror
Do not spray glass cleaner directly on the mirror. Use a soft towel dampened with water.