Headlamp: Description and Operation

Headlights (Without Daytime Running Lights)

Operation
Power to operate the headlights flows through the main light switch and the multi-function switch. When the multi-function switch lever is pulled part way toward the driver, the flash-to-pass switch closes and provides power to the high beam headlights.




Daytime Running Lights (Canadian Vehicles Only)

Operation
The daytime running lights (DRL) system operates the vehicle's high beam headlights at reduced power during the daytime to make the vehicle more visible to other drivers.

With the ignition switch in the ON position, the park brake released and the headlights turned off, the DRL module outputs a pulsing voltage to operate the high beam headlights at reduced intensity. When the DRL system is operating, the high beam indicator is not illuminated.

Applying the park brake or turning on the headlights disables the DRL system. Applying the park brake grounds the DRL module. Turning on the headlights in the low beam position applies battery voltage to the module (and removes the ground input that the DRL module senses through the 10 beam headlights). Turning on the headlights in the high beam position applies 12 volts to the DRL module.

A diode inside the DRL module prevents low brake fluid level from disabling the DRL system. The DRL system is used only on vehicles sold in Canada.

NOTE
^ The headlights may flicker during engine start-up and shutdown on DRL-equipped vehicles if the A/C-heater blower motor is turned on. This is a normal condition.
^ Also, during low beam headlights operation on a DRL-equipped vehicle, the high beam indicator will not illuminate when using the flash-to-pass feature.