See also:

The concept
HDC is a downhill driving assistant that automatically controls vehicle speed on steep downhill gradients. Without requiring brake application, the vehicle moves at slightly more than twice wa ...

Malfunction
A message is displayed in the instrument cluster. HDC is not available, e.g., due to elevated brake temperatures. ...

Parking lamps/low beams
0.  Lamps off, daytime running lights 1.  Parking lamps and daytime running lights 2.  Low beams, welcome lamps 3.  Automatic headlamp control, daytime running lights, welcome ...