Daytime Running Lamp: Description and Operation

The daytime running lamps feature will illuminate the high beam headlamps, pulse width modulated at a 40% duty cycle when the conditions exist:
^ The ignition switch is in the RUN position.
^ The headlamp switch is in the OFF or PARK position.
^ The autolamps feature has not illuminated the parking lamps and the headlamps.

The headlamps are controlled by the Front Electronic Module (FEM) and the instrument cluster in all phases of operation. The headlamp switch is hardwired to the instrument cluster, which sends a command through the standard corporate protocol network to the FEM, which outputs the appropriate voltage to the headlamps. For additional information, refer to Headlamp.