2003 Oldsmobile Alero Owner's Manual - Page 119

The exterior lamps control has three positions: (Parking Lamps): Turn the control to this position to turn on the parking lamps, together with the following. pf The DRL system will make your low-beam headlamps come on at a reduced brightness when the following conditions are met: The ignition is on. the exterior lamps control is in AUTO or the parking lamps only position. the light sensor detects daytime light, the parking brake is released, and the shift lever is not in PARK (P) on vehicles with an automatic transaxle only. When the DRL system is on, the taillamps, sidemarker lamps, parking lamps and instrument panel lights will not be illuminated unless you have turned the exterior lamps control to the parking lamp position. As with any vehicle, you should turn on the regular headlamp system when you need it. SidemarkerLamps Taillamps License Plate Lamps 0 Instrument Panel Lights (Headlamps): Turn the control to this position to turn on the headlamps, together with the previously listed lamps and lights. AUTO: Turn the control to this position to turn the headlamps, taillamps and parking lamps on and off automatically while the ignition is on, by sensing how dark it is outside. For more information see Automatic Headlamp System later in this section. - EO Automatic Headlamp System When it is dark enough outside, your Automatic Headlamp System will turn on your headlamps at the normal brightness along with other lamps such as the taillamps, sidemarker, parking lamps and the instrument panel lights. The radio lights will also be dim. Your vehicle is equipped with a light sensor on the top of the instrument panel under the defroster grill, so be sure it is not covered which will cause the system to be on whenever the ignition is on. Daytime Running Lamps (DRL) Daytime Running Lamps (DRL) can make it easier for others to see the front of your vehicle during the day. DRL can be helpful in many different driving conditions, but they can be especially helpful in the short periods after dawn and before sunset. Fully functional daytime running lamps are required on all vehicles first sold in Canada. 3-14