Daytime Running Lamps (DRL)

When the ignition switch is in the RUN position, the ambient light sensor indicates daylight, and the vehicle is not in PARK, the Daytime Running Lamps (DRL) are activated. When these conditions have been met, the lamp control module (LCM) supplies battery positive voltage (B+) through CKT 593 (DK BLU) to the high beam headlamps in series. Because the high beam headlamps are in series, they split the voltage supplied by the LCM and they light at a reduced intensity. The DRL are disabled if the flash-to-pass feature is activated or if the vehicle is placed in PARK. When the ambient light sensor indicates darkness, the low beams are automatically turn on at regular intensity and the high beam turn off.