Daytime Running Lamp: Description and Operation

NOTE:
- The headlamps may flicker during engine start up and shutdown on DRL-equipped vehicles if the A/C-Heater blower motor is turned "ON".

- Also, during "LO" beam headlamp operation on a DRL equipped vehicle, the "HI" beam indicator will not illuminate when using the flash-to-pass feature.

PURPOSE
The Daytime Running Lamps (DRL) System operates the vehicle's "HI" beam headlamps at reduced power during the daytime to make the vehicle more visible to others drivers.

OPERATION
With the ignition switch in "RUN", the park brake released and the headlamps turned "OFF", the DRL module outputs a pulsing voltage at pin 8 to operate the "Hi" beam headlamps at reduced intensity. When the DRL system is operating, the "HI" beam indicator is not illuminated.

Applying the park brake or turning on the headlamps disables the DRL system. Applying the park brake grounds pin 6 of the DRL module. Turning on the headlamps in the "LOW" beam position applies battery voltage to pin 7 of the module and removes the ground input that the DRL module senses through the "LO" beam headlamps. Turning on the headlamps in the high beam position applies 12 volts to pin 8 of the DRL module.

The diode shown 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