GM Service Manual Online
For 1990-2009 cars only

To adjust the brightness of the instrument panel lights, press lightly on the interior lamp control and release. The control will extend outward. Turn the control counterclockwise to brighten and clockwise to dim the instrument panel lights. Press on the control to return it to the stored position.

Parade Dimming

This feature prohibits the dimming of your instrument panel displays during daylight while your headlamps are on. When the light sensor reads darkness outside, you will be able to dim your instrument panel displays once again.