2012 GMC Canyon Owner's Manual - Page 137

Lighting 6-3 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 daytime running lamps are required on all vehicles first sold in Canada. The DRL system will come on when the following conditions are met: . . The taillamps, sidemarkers, and other lamps will not be on. The instrument panel will not be lit up either. When it begins to get dark, the headlamps will automatically switch from DRL to the regular headlamps. The regular headlamp system should be turned on when needed. The vehicle has a light sensor located on the top of the instrument panel. Do not cover the sensor, or the system will be on whenever the ignition is on. The system can turn on the headlamps when driving in a parking garage, through a tunnel or when there is overcast weather. This is normal. There is a delay in the transition between the daytime and nighttime operation of the Daytime Running Lamps (DRL) and the automatic headlamp system so that driving under bridges or bright overhead street lights does not affect the system. The DRL and automatic headlamp system will only be affected when the light sensor detects a change in lighting lasting longer than the delay. The ignition is on. The exterior lamps control is in AUTO. The transmission is not in P (Park) if you have an automatic transmission. The light sensor determines it is daytime. Automatic Headlamp System When it is dark enough outside, the automatic headlamp system will turn on after the transmission has been shifted from P (Park) to D (Drive). The headlamps, taillamps, sidemarker, parking lamps, roof marker lamps, and the instrument panel lights turn on at normal brightness. The radio lights will become dimmer when the headlights are off compared to when the headlights are on. . . When the DRL are on, only the parking lamps or reduced intensity low beam headlamps will be on.