2004 GMC Sierra 1500 Pickup Owner's Manual - Page 183

Interior Lamps Instrument Panel Brightness Control D: This feature controls the brightness of the instrument panel lights. The thumbwheel for this feature is located next to the headlamp control. Turn the thumbwheel up, or down, 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. Entry Lighting Your vehicle is equipped with an illuminated entry feature. When a door is 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. Front Reading Lamps If equipped, the reading lamps are located on the overhead console. 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. To turn the reading lamps on or off, press the button located next to each lamp. The lamps can be adjusted to point in the direction you want them to go. 3-19