Daytime Running Lamp: Description and Operation

DAYTIME RUNNING LAMPS (DRL)

The headlamp switch routes voltage to the headlamps, parking lamps and the autolamp system when demanded.

The autolamp system, controlled by the vehicle security module, supplies voltage to the same circuits used by the headlamp switch to power the exterior lamps when low light conditions are detected.

The autolamp system provides light sensitive automatic on/off control of the exterior lamps normally controlled by the headlamp switch. The autolamp system keeps the exterior lamps on for a pre-selected period of time after the ignition switch is turned off. The pre-selected time lapse is adjustable up to approximately three minutes. Refer to the owner literature for further information about the autolamp time lapse adjustment.

The Explorer headlamp system is a quad-beam pattern system. It consists of a low and high beam, with two replaceable bulbs. The headlamp assembly has the park/turn lamps integrated into the headlamp assembly.

The Mountaineer headlamp system is a dual-beam pattern system. It consists of a low and high beam, with a replaceable seal beam bulb. The headlamp assembly has the park/turn integrated on the top of the headlamp assembly.

The fog lamp switch is integral to the headlamp switch.

The daytime running lamps system operates the low-beam headlamps at a reduced intensity. The DRL module supplies pulse width modulated (PWM) voltage, 80% of battery voltage, to the low-beam headlamps when the following conditions are met:
- The multifunction switch is in the NEUTRAL position
- The parking brake control is released
- The headlamp switch is not in the headlamps ON position
- The ignition switch is in the RUN position
- The autolamps feature has not activated the headlights