GM Service Manual Online
For 1990-2009 cars only

The vehicle may have an automatic dimming rearview mirror with the OnStar® System.

The automatic dimming feature turns on each time the vehicle is started. To turn automatic dimming off or on, press the left button below the mirror. A green indicator light will be on when automatic dimming is on.

While turned on, this mirror functions exactly like the automatic dimming mirror described previously.

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