2003 GMC Yukon Owner's Manual - Page 172

This switch is located on the center of the instrument panel near the comfort controls. Turn the thumbwheel up to adjust the instrument panel lights. Turn the thumbwheel up to return the radio display to full brightness when the headlamps or parking lamps are on. To turn on the dome lamps, turn the thumbwheel all the way up. Exit Lighting With exit lighting, the interior lamps will come on when you remove the key from the ignition. The lights will not come on if the dome override button is pressed in. Entry Lighting When the switch wiring is connected to an auxiliary roof mounted lamp, pressing the switch will activate the lamp and illuminate an indicator light near the switch. Pressing the switch again will turn off the roof mounted lamp. Your vehicle is equipped with an illuminated entry feature. When the doors are opened, the dome lamps will come on if the dome override button is in the out position. If the dome override button is pressed in, the lamps will not come on. Interior Lamps Instrument Panel Brightness D: This feature controls the brightness of the instrument panel lights. The thumbwheel for this feature is located next to the headlamp control. 3-18