2004 GMC Canyon Owner's Manual - Page 139

Cargo Lamps If your vehicle is equipped with cargo lamps, you can use them if you need more light in the cargo area of your vehicle. The dome lamps must be on before you can turn on the cargo lamps. Press this button to turn the cargo lamps on and off. Interior Lamps Instrument Panel Brightness The thumbwheel for this feature is located next to the exterior lamps control. See Exterior Lamps on page 3-12. D (Instrument Panel Lights): Turn the thumbwheel up or down to brighten or dim the instrument panel lights and the radio display. This will only work if the headlamps or parking lamps are on. To turn on the dome lamp, with the vehicle doors closed, turn the thumbwheel all the way up. 3-15