When the switch is in position, the low beams are switched on and off automatically depending on ambient light conditions, e.g. in a tunnel, in twilight, or if there is precipitation.


The headlamps may also come on when the sun is sitting low on a blue sky.
When driving into tunnels with bright overhead lights, there may be a delay before the headlamps come on. The low beams remain switched on independent of the ambient lighting conditions when you switch on the fog lamps.

The automatic headlamp control cannot serve as a substitute for your personal judgment in determining when the lamps should be switched on in response to ambient lighting conditions. For example, the system cannot detect fog or hazy weather. To avoid safety risks, you should respond to these kinds of low-visibility situations by switching the headlamps on manually.