See also:

What to do if...
Only a black screen is visible. Switch on the system. There are no options available on the screen. Switch over between the display screens. Radio stations or TV channels are grayed out ...

Switching on/off manually
Press the button. On: the LED lights up. Off: the LED goes out. If Top View is displayed, switch on the backup camera via the iDrive. ...

Activating HDC
Press the button; the LED above the button lights up. ...