Headlight Switch

It may be a rotary knob or stalk. AUTO mode uses a light sensor. It sends signals to the body module. Some cars have separate switches for fog lights and parking lights; others combine everything in one stalk. Automatic headlights rely on a light sensor usually near the windscreen.

Switch positions request lighting functions.

Faulty switches can cause lights that won't turn on or off. Check bulbs and fuses first.