Enabling operation in the rear
Only possible via the iDrive in the front.
1. "Settings"
2. "Allow rear control"
3. Select the desired priority.

See also:
End of warning
The warning ends:
Automatically after approx. 3 seconds.
When returning to your own lane.
When braking hard.
When using the turn signal.
...
General driving notes
Closing the trunk lid
Drive with the trunk lid closed
Only drive with the tailgate closed; otherwise,
in the event of an accident or braking or
evasive maneuvers, passengers or other road
use ...
Remove attached parts following use
Remove unneeded auxiliary mirrors, roof or rear
luggage racks after use.
Attached parts on the vehicle impair the aerodynamics
and increase the fuel consumption. ...
