2004 Chevrolet Tahoe Owner's Manual - Page 170
2004 Chevrolet Tahoe Manual
Page 170 highlights
Exterior Lamps AUTO (Automatic): Turning the control to this position puts the system into automatic headlamp mode. ; (Parking Lamps): Turning the control to this position turns on the parking lamps, together with the following: Sidemarker Lamps Taillamps License Plate Lamps Instrument Panel Lights Roof Marker Lamps (If Equipped) 5 (Headlamps): The control on the driver's side of your instrument panel operates the exterior lamps. Turn the control clockwise to operate the lamps. The exterior lamp control has four positions: Turning the control 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. 9 (Off): Turning the control to this position turns off the Daytime Running Lamps (DRL) and the automatic headlamps. 3-14