See also:

Malfunction
A Check Control message is displayed. The parking assistant failed. Have the system checked. ...

Tone control
You can alter various tone settings, e.g. treble and bass or the speed-dependent volume increase. The tone settings are applied to all audio sources. The settings are stored for the remote control ...

Bluetooth audio
At a glance ► Music files on external devices such as audio devices or mobile phones can be played back via Bluetooth. Use of a mobile phone as an audio source, refer to page 205. ► ...