GM Service Manual Online
For 1990-2009 cars only

This feature controls the brightness of the instrument panel lights.

The thumbwheel for this feature is located to the right of the exterior lamp control.

Turn the thumbwheel up to brighten the lights. When the thumbwheel is moved to the first position, the radio display and transmission selection display will go to full intensity. The instrument panel cluster will also be dimly lit. Moving the thumbwheel up to the next position will activate the interior dome lamps.