When the low beam is on, the outer headlights work, when the high beam is on, all four work. The two outer headlights use dual-filament halogen lamps for the low and high beam, and the inner headlights use single-filament halogen lamps for the high beam. The electrical circuits of the headlights are protected by fuses, and power is supplied to the lamps through a relay.
Caution! High beam headlight lenses cannot be used in low beam headlights.