Buckling the belt
Make sure you hear the latch plate engage in the belt buckle.
See also:
Enabling operation in the rear
Only possible via the iDrive in the front.
1. "Settings"
2. "Allow rear control"
3. Select the desired priority.
...
Switching the split screen on and off
1. Press the button.
2. "Split screen" ...
Switching on/off manually
Press the button. ...