GMC sierra 2002 User Manual

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 switch has three positions:

 (OFF): Turning the switch to this position turns off

all lamps, except the Daytime Running Lamps (DRL). 
It also puts the system into automatic headlamp mode.

 (Parking Lamps): Turning the control to this

position turns on the parking lamps, together with 
the following:
D Sidemarker Lamps
D Taillamps
D License Plate Lamps
D Instrument Panel Lights
D Roof Marker Lamps (If Equipped)

 (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 pulling on the turn signal/high

-

beam lever.

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.