See also:

Safety switch for the rear
Press the button on the driver's door if children are being transported in the rear. This locks various functions so that they cannot be operated from the rear: safety switch. ...

Selecting a channel
You can only listen to enabled channels. The selected channel is stored for the remote control currently in use. Via iDrive1.  "Radio" 2.  "Satellite radio" 3.  ...

LATCH child restraint fixing system
LATCH: Lower Anchors and Tether for CHildren. ...