The light sensor measures the surrounding light conditions with the aid of a photo cell and switches on the low-beam headlights automatically at dusk. The light sensor comprises the coming home / leaving home function. When leaving the vehicle, the front fog lights, tail lights and number-plate light are switched off after a certain delay (coming home) and switched on when the driver unlocks the doors with the
radio-operated remote control or the
advanced key (leaving home). The car?s outside lights can thus be used to light the way to the front door or the vehicle in the dark. On the new Audi A6, the time delay before the lights are switched off can be adjusted via the
MMI system - for example, to coincide with the amount of time it takes to walk from the vehicle to the house.