See also:

USB audio interface/audio interface for mobile phone
OverviewIt is possible to connect external audio devices. They can be operated via iDrive. Sound is output over the vehicle speakers. Options for connecting external devices > Connection via US ...

Switching on/off manually
Press the button. ...

Following part replacement
The same breaking in procedures should be observed if any of the components mentioned above have to be renewed in the course of the vehicle's operating life. ...