2003 GMC Sonoma Owner's Manual - Page 139

Erasing Speed Memory When you turn off the cruise control or the ignition, your cruise control set speed memory is erased. The exterior lamp control has three positions: 0 (Off): Turn the exterior lamps control all the way counterclockwise to turn off the lamps and put the system in automatic headlamp mode. (Parking Lamps): Turning the exterior lamps control to this position turns on the parking lamps together with the following: Exterior Lamps Sidemarker Lamps Taillamps License Plate Lamps Instrument Panel Lights -g- (Headlamps): Turning the exterior lamps control to this position turns on the headlamps, together with the previously listed lamps and lights. The control on the driver's side of the instrument panel operates the exterior lamps. 3-12