Maintaining/storing the speed
Press the button.
or:

Press the rocker switch while the system is interrupted.
When the system is switched on, the current speed is maintained and stored as the desired speed.
It is displayed in the speedometer and briefly displayed in the instrument cluster, Displays in the instrument cluster.
When cruise control is maintained or stored, DSC Dynamic Stability Control is switched on, if necessary.
See also:
Switching on automatically
Select transmission position R with the engine
running.
The images from Top View and PDC are displayed
when the system has been switched on
using iDrive. ...
Radio
FM
AM
Satellite radio
Stored stations
...
Vehicle information
Owner's Manual
Computer
Vehicle
...
