See also:

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

Defrosting and defogging windows
Press the button. Ice and condensation are quickly removed from the windshield and the front side windows. For this purpose, also switch on the cooling function. ...

Reference
This chapter contains technical data, short commands for the voice activation system and an index that will help you find information most quickly. ...