See also:

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

BMW 7 Series Owners Manual
h4 {color:#800000} h3 {color:#0033CC} h2 {color:#008000} h1 {color:#FF0000} ...

Volume
► "Speed volume": speed-dependent volume control. ► "PDC": volume of the PDC signal compared to the entertainment sound output. ► "Gong": volume of ...