1999 Chevrolet Prizm Owner's Manual - Page 105

yellowblue CENTER: This middle position will turn on the following: Automatic Light Control (ALC) Your vehicle is equipped with an automatic light sensor on top of the instrument panel, so be sure it is not covered or the headlamps will be on continuously. When it is dark enough outside, your ALC will turn on your low-beam headlamps at the normal brightness along with other lamps such as the taillamps, sidemarker, parking lamps and instrument panel lights. There is a 20-second delay in the transition between daytime and nighttime operation of the DRL and the ALC systems. If the light sensor senses a reduction in lighting that lasts longer than 20 seconds, it will activate the headlamps. If you are driving through a parking garage, heavy overcast weather, or a tunnel, the ALC will turn on your low-beam headlamps at a normal brightness along with the taillamps, sidemarker, parking lamps and the instrument panel lights. The radio lights will be dimmer. As with any vehicle, you should turn on the regular headlamp system when you need it. D D D D D D D D D D D Parking Lamps Sidemarker Lamps Taillamps License Plate Lamp Instrument Panel Lights : This position will turn on the following: Headlamps Parking Lamps Sidemarker Lamps Taillamps License Plate Lamp Instrument Panel Lights Turn the switch toward you to turn off the lamps. 2-35