Daytime Running Lamp: Description and Operation

WARNING: DAYTIME RUNNING LAMP RELAY GETS VERY HOT DURING OPERATION. BE SURE RELAY HAS COOLED BEFORE HANDLING IT

The Daytime Running Lamp (DRL) system is designed to turn the high-beam headlamps ON with a reduced light output and without illuminating the high-beam indicator in the instrument cluster when the following conditions are met:
^ The ignition switch is in the RUN position.
^ The headlamp switch is in the OFF or PARK position.

The DRL system, which is required by the Canadian government for vehicles sold in Canada, contains the following:
^ A module located in the power distribution box.
^ Wiring connected to the headlamp dash panel junction wire.
^ The DRL output of rapidly pulsating short bursts of power which cannot be measured using most multi meters.