Circuit Description

The Daytime Running Lamps (DRL) activate under the following conditions:
^ The ignition switch is in the RUN position.
^ The ambient light sensor indicates daylight.
^ The vehicle is not in the PARK position.

When the above conditions are met, the Lamp Control Module (LCM) supplies battery positive voltage (B+) to the low beam headlamps through CKT 589 (GRY), the DRL resistor, and CKT 12 (TAN). The DRL resistor reduces the voltage supplied by the LCM. The low beam headlamps light at a reduced intensity. The DRL disable if the vehicle is placed in the PARK position. When the ambient light sensor indicates darkness, the low beam headlamps automatically switch from a reduced intensity to a regular intensity.