See also:

Adjusting volume
Turn knob 1next to the CD/DVD player until the desired volume is obtained. You can also adjust the volume with buttons on the steering wheel. ...

Rear doors
Push the locking lever on the rear doors down. The door can now be opened from the outside only. ...

Automatic deactivation during forward travel
The system switches off when a certain driving distance or speed is exceeded. Switch the system back on if necessary. ...