Daytime Running Lamp Control Unit: Description and Operation

DAYTIME RUNNING LAMP MODULE
The Daytime Running Lights (Headlamps) System is installed on vehicles manufactured for sale in Canada only. A separate module, mounted on the cowl, controls the DRL.

Battery positive voltage is supplied to the Daytime Running Lamp (DRL) module through a circuit breaker and a fuse in the PDC. Ignition positive voltage is supplied to the DRL module through a fuse in the fuse block. The DRL module also utilizes a VSS input, high and low beam sense circuits and high beam indicator driver. The DRL module is grounded to the chassis. Once the vehicle reaches a speed of 3 kph (2 mph) and travels more than 1 meter (3 feet) with the headlamp switch in the off position, the DRL module will activate the HIGH beams at a reduced intensity (36% of full intensity). When the headlamp switch is placed in the LOW beam position the DRL will turn off. When the headlamp switch is turned to the HIGH beam position, the high beams will operate normally (full intensity) and the DRL module will also illuminate the HIGH BEAM indicator in the instrument cluster.