With Daytime Running Lights (DRL)

HEADLAMP SYSTEM WITH DAYTIME RUNNING LIGHTS-(CANADA ONLY)





All vehicles built to be sold in Canada are equipped with a Daytime Running Light (DRL) system. This system is activated any time the ignition key is in the run position, the headlamp switch is off and the parking brake is released.

On vans with a two headlamp system, the high beam circuit is energized at half voltage, causing the lamps to be dimly lit. On a four headlamp circuit, the high beams will be dimly lit, while the low beams will be lit even dimmer.

When the daytime running lights are on, the DRL indicator lamp will light on the instrument panel.

Voltage is applied at all times to the DRL relay through the DRL fuse and the orange wire (figure 6). When the ignition switch is in the RUN position, voltage is applied through the GAGES fuse and the pink/black wire. When the coil is energized, the switch in the relay closes, and current flows through the dark blue/orange - dark blue/white wire to the high beam of the left headlamp and through the light green wire to the high beam of the right headlamp and to ground. This puts the high beam lamps in series.

The DRL module controls the relay to prevent the running lights from turning on when the parking brake is applied, the engine is being cranked, or the headlamp switch is turned on. It does this by controlling the ground side of the relay coil (light green/black wire) and the ground side of the relay switch (black wire). The module provides a ground path for the relay through the light green/black wire, and the relay is activated and the DRL ON indicator lamp on the instrument panel lights.

If the parking brake is applied, the DRL module senses this through the tan/white wire from the diode array. If the engine is cranked, voltage will not be applied through the pink/black wire. In either instance, the DRL module will not switch the light green/black wire from the relay to ground, so the relay will not energize.

The DRL module is also part of the headlamp circuit. The headlamp wiring and dimmer switch wiring connect to the module through the yellow wire and light green wire. When the headlamp switch is turned on, the module senses battery voltage at the yellow wire and will not connect the light green relay wire to ground. With the relay de-energized, the headlamps work in the usual way. However, ground for the left headlamp is provided through the dark blue/white - dark blue/orange wire, the normally closed contacts of the DRL relay, and the black wire.