Daylight Running Lamps Supply (Description and operation)

Daylight Running Lamps Supply

The feed from fuse 13 in the engine compartment fusebox is connected to the coil of the daylight running relay and the IDM integral with the passenger compartment fusebox.

When the engine is started, the IDM senses, through internal circuitry, that the engine is running and provides an earth for the daylight running relay coil. The energised coil closes the contacts of the daylight running relay allowing the feed from fuse 5 in the passenger compartment fusebox to pass through the relay contacts.

Daylight Running Lamps Operation

Canadian vehicles The feed from the daylight running relay contacts flows from the passenger compartment fusebox and is connected to a 0.75 Ohm in-line resistor on an RU wire. The feed from the in-line resistor is reduced to 6.7 V and reconnected to the passenger compartment fusebox on a UY wire. The feed is connected to fuses 3 and 22 in the passenger compartment fusebox, where it operates both headlamp main beam bulbs at reduced power.

Scandinavian vehicles The feed from the daylight running relay contacts flows from and back to the passenger compartment fusebox on a UY wire. The feed is connected to fuses 9 and 10 in the passenger compartment fusebox, where it operates both headlamp dip beam bulbs.