2009 GMC Envoy Owner's Manual - Page 146

Headlamps on Reminder A reminder tone sounds when the headlamps or parking lamps are manually turned on, if the driver's door is open and the ignition is in LOCK/OFF or ACC/ACCESSORY. To turn the tone off, turn the knob all the way counterclockwise. In the automatic mode, the headlamps turn off once the ignition key is in LOCK/OFF. When the DRL are on, only the headlamps will be on. The taillamps, sidemarker, instrument panel lights and other lamps will not be on. When it begins to get dark, the headlamps automatically switch from DRL to the regular headlamps. Automatic Headlamp System When it is dark enough outside, the Automatic Headlamp System turns on the headlamps when the vehicle is started and after the transmission has been shifted out of the P (Park) position. The headlamps, taillamps, sidemarker, and parking lamps will come on. The instrument panel lights and radio lights will also turn on at normal brightness. Once on, the system remains on during these conditions even if the vehicle is shifted back into P (Park). The vehicle has a light sensor on the top of the instrument panel. Do not cover the sensor or the system may come on whenever the ignition is on and the vehicle is shifted out of the P (Park) position. The system could also turn on the lamps when driving through a parking garage, heavy overcast weather or a tunnel. This is normal. Daytime Running Lamps (DRL) Daytime Running Lamps (DRL) can make it easier for others to see the front of your vehicle during the day. Fully functional DRL are required on all vehicles first sold in Canada. The DRL system makes the headlamps come on at reduced brightness when the following conditions are met: • The ignition is on. • The exterior lamps knob is in automatic headlamp mode. • The light sensor detects daytime light. • The transmission is not in P (Park). 3-14