Principles of Operation

Daytime Running Lamps (DRL)

Principles of Operation

The Body Control Module (BCM) controls the Daytime Running Lamps (DRL) by using various inputs to determine whether or not the DRL should be illuminated. These inputs include:

- Ignition status
- Headlamp switch position
- Headlamps on or off
- Transmission gear selection

When the DRL is active, the BCM provides a pulse-width modulated voltage to the low beam headlamps. This illuminates the headlamps at a reduced intensity.

The DRL is not a programmable parameter for this vehicle.