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, rotate the knob clockwise. For daytime driving, turn the knob counterclockwise.

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