See also:

Malfunction
A Check Control message is displayed. On the Control Display, the areas in front of and behind the vehicle are shaded. PDC has failed. Have the system checked. To ensure full operability: ...

Switching on/off manually
Press the button. On: the LED lights up. Off: the LED goes out. ...

Running a function
Press the button. The function will run immediately. This means, for example, that the number is dialed when a phone number is selected. ...