See also:

Setting the language
Press the adjustment button for 12‑13 seconds. Briefly press the adjustment button again to switch between English "E" and German "O". The setting is automatically saved ...

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

Switching on/off manually
Press the button. On: the LED lights up. Off: the LED goes out. The PDC is shown on the Control Display. Switch on the backup camera via the iDrive. ...