2003 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 168

Exterior Lamps AUTO (Automatic): Turning the control to this position puts the system into automatic headlamp mode. An indicator light will illuminate when this position is selected. (Parking Lamps): Turning the control to this position turns on the parking lamps, together with the following: 0 too: Sidemarker Lamps Taillamps License Plate Lamps Instrument Panel Lights Roof Marker Lamps (If Equipped) 0 0 0 0 The switch on the driver's side of your instrument panel operates the exterior lamps. Turn the control clockwise to operate the lamps. The exterior lamp switch has four positions: a (Headlamps): Turning the switch to this position turns on the headlamps, together with the previously listed lamps and lights. You can switch your headlamps from high to low-beam by pushing the turn signal/high-beam lever towards the instrument panel. A circuit breaker protects your headlamps. If you have an electrical overload, your headlamps will flicker on and off. Have your headlamp wiring checked right away if this happens. 3-13 0(OFF): Turning the switch to this position turns off the Daytime Running Lamps (DRL) and the automatic headlamps. An indicator light will illuminate when the position is selected.