See also:

Deactivating HDC
Press the button again and the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

Headlamp range control
With halogen headlamps, the headlamp range of the low beams can be manually adjusted for the vehicle load to avoid blinding oncoming traffic. The values following the slash apply to trailer oper ...

Parking lamps/low beams,headlamp control
General information Switch position: 0, , If the driver door is opened with the ignition switched off, the exterior lighting is automatically switched off at these switch settings. Parking lamps ...