See also:

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

What to do if...
Information on suitable mobile phones. Appointments, tasks, notes, text messages, or e-mails from the mobile phone are not displayed. The mobile phone is not capable of the missing function ...

HDC Hill Descent Control
The concept HDC is a downhill driving assistant that automatically controls vehicle speed on steep downhill gradients. Without applying the brakes, the vehicle moves at slightly more than walking ...