With Daytime Running Lights (DRL)

The Daytime Running Lights (DRL) Module is designed to automatically operate certain lights depending on outside light conditions. The DRL Module operates in two modes. In the Day Mode, the LO Beam Headlights are lit at reduced brilliance. In the Night Mode, the LO Beam headlights are lit at full brilliance and the Front Marker, Park and Tail Lights are lit.

When the DRL Module is in the Day Mode, the Day Mode contacts close, applying voltage to the Diode Assembly and the LO Beam Headlights. The Diode Assembly reduces the voltage applied to the Headlights, thus reducing the brilliance of the Headlights.

When the Photoresistor senses darkness, the DRL Module operates in the Night Mode. The Night Mode contacts close, applying voltage to the Headlights and other Exterior Lights through the same circuit path as when the Light Switch is in HEAD.

If the engine should stall with the DRL Module in the Night Mode, the DRL Module will turn off the Headlights and leave the Marker, Park and Tail Lights lit while the engine is being cranked.

PHOTORESISTOR INPUT

The Photoresistor is a light sensitive variable resistor. Its resistance decreases as outside light intensity increases. The DRL Module measures the voltage drop across the Photoresistor and determines whether it should operate in the Day Mode or Night Mode.

PARK BRAKE INPUT

If the Park Brake is applied before the Ignition Switch is turned to RUN, the DRL Module will not operate any Headlights or Exterior Lights. This allows the operator to start the vehicle and keep the Headlights off, as long as the Park Brake is applied. This feature allows the operator to turn off the Headlights when the Ignition Switch is in RUN and is intended for use during service, or while parked at a drive-in theater, etc. When the Park Brake is released with the Ignition Switch in RUN, the DRL Module will activate the Headlights.

This feature will only function when the Park Brake is applied before the Ignition Switch is turned to RUN. If the Park Brake is applied after the Ignition Switch is turned to RUN, the Headlights will not turn off.

HI BEAM ON INPUT

Sedan

The DRL Module will turn off the LO Beam Headlights if it senses battery voltage at the HI Beam On Input. This is to prevent the LO Beam and HI Beam Headlights from operating at the same time. The HI Beam On Input will sense battery voltage when the Flash To Pass feature is operated.

Coupe

The HI Beam On Input operates similar to the Sedan except that the LO Beam Headlights remain on with the HI Beam Headlights. This is due to the Mini-Quad Relay which is energized any time the HI Beam Headlights on ON.

FOG LAMPS

Anytime the Light Switch is in PARK or HEAD or when the DRL Module is operating in the Night Mode, voltage is applied to the Fog Lamp Audio Switch Assembly. When the Fog Lamp Switch is turned to ON, voltage is applied to the Fog Lamp Relay. As long as the Headlight Dimmer Switch is in LO, a ground is provided for the Fog Lamp Relay through the HI Beam filaments and the Fog Lamps come on. When the Headlight Dimmer Switch is moved to HI, battery voltage is at both sides of the Fog Lamp Relay coil and the Fog Lamps go out.