1997 GMC Sonoma Owner's Manual - Page 92

Lamps On Reminder A reminder tone will sound when your headlamps or parking lamps and interior lamps are turned on and your ignition is in OFF, LOCK or ACCESSORY. To turn the tone off, press the OFF switch. When the DRL are on, only your headlamps will be on. The taillamps, sidemarker and other lamps won't be on. The instrument panel won't be lit up either. When it begins to get dark, your DRL indicator light is a reminder to turn your headlamp switch on. The other lamps that come on with your headlamps will also come on. When you turn the headlamp switch off, the regular lamps will go off, and your headlamps will change to the reduced brightness of DRL. Daytime Running Lamps 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. The DRL system will make your headlamps come on at reduced brightness when: the ignition is on, 0 0 To idle your vehicle with the DRL off, set the parking brake. The DRL will stay off until you release the parking brake. As with any vehicle, you should turn on the regular headlamp system when you need it. the headlamp switch is off and the parking brake is released. 2-44