General Description

The Daytime Running Lamp (DRL) system has two primary components: a body control module (BCM), (located in the instrument panel) and an ambient light sensor, (located on the top of the instrument panel upper trim plate along the base of the windshield).

The DRL system operates the front high-beam headlamps at a reduced brightness, when the following conditions exist:
^ The ignition switch is ON
^ The headlamp switch is OFF
^ The park brake is released

To temporarily disable the DRL system while idling the vehicle, if necessary:
1. Turn the ignition switch to the OFF or LOCK position.
2. Set the park brake.
3. Start the engine and allow it to idle.

The DRL system will remain disabled until the park brake is released.

Day Mode Operation
When the ambient light sensor detects that sufficient lighting conditions exist outside the vehicle, the BCM will operate the high-beam headlamps at a reduced brightness

Lowlight Mode Operation
When the ambient light sensor detects that low lighting conditions exist outside the vehicle, the BCM will operate the low beam headlamps at normal intensity along with the park/sidemarker/license lamps and instrument panel lamps.