If your vehicle has this feature, this mirror has a knob located at the bottom of the mirror. It is used to change the mirror from day to night position. To reduce glare from headlamps behind you while driving at night, turn the knob counterclockwise. For daytime driving, turn the knob clockwise.

There are also three OnStar® buttons located at the bottom of the mirror face. See your dealer/retailer for more information on the system and how to subscribe to OnStar®. See OnStar® System for more information about the services OnStar® provides.