See also:

Deleting all stored programs
Press both outer memory buttons 1 for approx. 20 seconds until the LED flashes rapidly. All stored programs are deleted. The programs cannot be deleted individually. ...

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

Enabling DVD system
The DVD system can be enabled via iDrive. 1. "Settings" 2. "Allow rear control" 3. "Rear DVD system active" Rear DVD system active ...