Switching the split screen on and off
1. 
Press the button.
2. "Split screen"
See also:
Calling up the desired speed and
distance
While driving
Press the button with the system
switched on.
In the following cases, the stored speed value is
deleted and cannot be called up again:
▷ When the system is switched off.
& ...
Deleting all stored programs
Press both outer memory buttons 1 for approx.
20 seconds until the LED flashes rapidly.
All stored programs are deleted.
The programs cannot be deleted individually. ...
BMW Maintenance System
The maintenance system directs you to required
maintenance measures and thereby supports
you in maintaining road safety and the operational
reliability of the vehicle. ...