2012 GMC Sierra Owner's Manual - Page 208

6-8 Lighting Dome Lamp Override The dome lamp override button is located next to the exterior lamps control. Cargo Lamp The cargo lamps come on by turning the instrument panel brightness control knob to the farthest clockwise position. This knob is located on the instrument panel and also turns on the dome lamps. The cargo lamps can be used if more light is needed in the cargo area of the vehicle or in the top-box storage units. Reading Lamps For vehicles with reading lamps, they are located on the overhead console. To turn on the reading lamps, press the button located next to each lamp. To turn them off, press the button again. The vehicle may also have reading lamps in other locations. To turn the lamps on or off, press the button located next to the lamp. Dome Lamps The dome lamps are located in the overhead console. They come on when any door is opened and turn off after all the doors are closed. Turn the instrument panel brightness knob located below the dome lamp override button, clockwise to the farthest position to manually turn on the dome lamps. The dome lamps remain on until the knob is turned counterclockwise. Press the button in and the dome lamps remain off when a door is opened. Press the button again to return it to the extended position so that the dome lamps come on when a door is opened. k (Dome Off): If the vehicle has a DVD Rear Seat Entertainment (RSE) system, press the lamp lenses to turn the lamps on or off. The lamps are fixed and cannot be adjusted.