Headlights Circuit Description

With the daytime running lamps (DRL) programmed to be on, the DRL will operate when the ignition switch is in the ON position, the gear selector lever is out of the PARK position, the headlamp switch is in the OFF position, and the ambient light sensor indicates daytime conditions. The DRL will remain on at night if the twilight sentinel switch is in the OFF position, and the headlamp switch is in the OFF position. Battery positive voltage (B+) is supplied to the DRL relay coil through the underhood fuse block. Battery positive voltage is supplied through the underhood fuse block FOG/DRL Fuse to the DRL relay normally open switch. When the Dash Integration Module (DIM) determines that conditions are right for the DRL, the DIM grounds the DRL relay coil. This energizes the DRL relay coil and closes the switch. Battery positive voltage (B+) is supplied through the DRL resistor to the LH and RH low beam headlamps.