2011 Chevrolet Silverado 1500 Regular Cab Owner's Manual - Page 216

6-8 Lighting Turn the knob clockwise or counterclockwise to brighten or dim the instrument panel lights. Turning the knob to the farthest clockwise position turns on the dome lamps. Interior Lighting Instrument Panel Illumination Control 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. 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. D (Instrument Panel Brightness): This feature controls the brightness of the instrument panel lights and is located next to the exterior lamps control. Push the knob to extend out and then it can be turned.