Headlights (Canada)

Exterior Lights

How the Headlights Circuit Works (Canada)

High and Low Beams
The headlight relays receive battery voltage at all times, and are controlled by the driver's multiplex control unit. When you turn the headlight switch to the HEAD position, ground is applied through the GRN wire to the coils of the headlight relays. The headlight relays are then energized, applying battery voltage to the left and right high and low beam headlight filaments, the DRL control unit, the high beam indicator and the dimmer relay through fuses 43 and 45 (in the under-hood fuse/relay box). The low beam bulbs come on because they are individually grounded by G301 and G201. The DRL control unit provides power to the left and right high beam headlight bulbs. With the low beams already on, pulling the dimmer switch to HIGH energizes the dimmer relay. When energized, the dimmer relay provides a path to ground for the high beam bulbs and the high beam indicator.

Flash-to-Pass
When you hold the flash-to-pass switch in the ON position, ground is applied through the GRN wire to the coils of the headlight relays. The relays are then energized, applying battery voltage to the left and right high and low beam headlight filaments, the DRL control unit, the high beam indicator and the dimmer relay through fuses 43 and 45 (in the under-hood fuse/relay box). The low beam bulbs come on because they are individually grounded by G301 and G201. The DRL control unit provides power to the left and right high beam headlight bulbs. With the flash-to-pass switch in ON, ground is provided to the dimmer relay coil. The dimmer relay is then energized, which provides a path to ground for the high beam bulbs and the high beam indicator.

Auto-off Lights Function (EX, EX-L)
The headlight relays are controlled by the driver's multiplex control unit. If you leave the headlight switch in the HEAD position and exit the vehicle, the control unit will automatically turn the exterior lights off within 15 seconds after you close the doors. When you unlock or open the driver's door, the control unit automatically turns the lights back on.

Daytime Running Lights
When you turn the ignition switch to ON (II) with the parking brake released, the DRL control unit controls voltage and ground. The high beam headlights operate in series and act as resistors to reduce the voltage to the headlights.

If you apply the parking brake, ground is applied to the DRL control unit
GRN/RED wire. If the parking brake is applied before you turn the ignition switch to ON (II), the daytime mode will remain off until you release the parking brake. Once the high beams are in the daytime mode, applying the parking brake will not turn them off.