Daytime Running Lamps (DRL)

When the ignition switch is in RUN, the ambient light sensor indicates daylight and the gear selector is not in the PARK position, the Daytime Running Lamps (DRL) are activated. When these conditions have been met, battery positive voltage (B+) is supplied from the Lamp Control Module (LCM) through the Daytime Running Lamps (DRL) resistor to the low beam headlamps. The voltage drop across the daytime running lamps (DRL) resistor causes the low beam headlamps to light at a reduced intensity. The DRL are disabled if the high beam headlamps are on or if the gear selector is placed in the PARK position. When the ambient light sensor indicates darkness, the low beams are automatically switched to regular intensity.