Canada

Daytime Running Lights Day Mode
When you turn the ignition switch to ON (II) with the parking brake released, the daytime running lights control unit supplies battery voltage through the RED/YEL and RED/GRN wires to the high beam headlights in series. Each high beam headlight receives less than battery voltage causing them to come ON at reduced brightness. If you apply the parking brake, ground is applied to the daytime running lights control unit at the GRN wire. If you apply the parking brake when the ignition switch is first switched to ON (II), the high beam headlights will remain OFF until the parking brake is released. Once the high beam headlights are ON, applying the parking brake will not turn them OFF. When you switch to low beams, high beams or flash-to-pass, battery voltage from the headlight relay is applied to the daytime running light control unit through the RED/YEL and RED/WHT wires. The daytime running light control unit then turns OFF the headlights.

Low Beams
The headlight relay receives battery voltage at all times. When you turn the headlight switch to the HEAD position and dimmer switch is in LO, ground is applied at the BLU/RED wire to the coil of the headlight relay. This energizes the relay, applying battery voltage to the left and right low beam headlights and to the daytime running lights control unit through fuses 45 and 46. The low beam bulbs come ON because the opposite terminal is tied to ground. The high beam bulbs and indicator remain OFF because the ground path to these bulbs is interrupted by the deactivated dimmer relay.

High Beams
With the low beams already ON, battery voltage is applied to the daytime running lights control unit through the RED/YEL and RED/GRN wires. The control unit then supplies battery voltage from the RED/YEL and RED/GRN wires to the high beam headlights. When you pull the dimmer switch to HI, ground is applied to the dimmer relay. This energizes the dimmer relay, applying ground to the high beam headlights and high beam indicator which turns ON the the high beams and indicator light. The low beams stay ON (see low beam operation).

Flash-to-Pass (USA and Canada)
When you hold the flash-to-pass switch in the ON position, ground is applied at the BLU/RED wire to the coil of the headlight relay and at the RED/BLU wire of the dimmer relay. This energizes the headlight relay, applying battery voltage to the low and high beam bulbs and to the dimmer relay. As the low beam bulbs receive battery voltage, the dimmer relay is energized, applying ground at the RED/BLU wire to the high beam bulbs and high beam indicator which turns ON the high beams and indicator light.