USA

How the Headlights Circuit Works

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 BLU/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 headlights through fuses 43 and 45. The low beam bulbs come on with the dimmer switch in LOW or HIGH because the opposite terminal is tied to ground. The ground path for the high beams and indicator is through the dimmer switch. With the dimmer switch in LOW the path is interrupted and the high beams remain off, but in HIGH a ground path is provided and the high beams come on.

Flash-to-Pass
When you hold the flash-to-pass switch in the ON position, ground is applied through the BLU/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 headlights through fuses 43 and 45. The low beam bulbs come on because the opposite terminal is tied to ground. The high beams and indicator also come on because the opposite terminal is provided a path to ground through the closed flash-to-pass switch.

Auto-off Lights Function
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.