See also:

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

System limits
Check the traffic situation as well Check the traffic situation around the vehicle with your own eyes. Otherwise, an accident could result from road users or objects located outside the pict ...

Deleting all stored programs
Press the left and right memory buttons for approx. 20 seconds until the LED flashes rapidly. All stored programs are deleted. The programs cannot be deleted individually. ...