See also:

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

Switching on/off manually
Press the button. ...

Lamp and bulb replacement
General information Lamps and bulbs make an essential contribution to vehicle safety. The manufacturer of the vehicle recommends that you entrust corresponding procedures to the service center ...