The Flat Tire Monitor (FTM)

NOTE: The resetting process finishes during driving, which can be interrupted at any time. When driving resumes, resetting is continued automatically.

Set the tire pressure of all wheels to specification.
On iDrive Control Center, select "VEHICLE INFO", then "VEHICLE STATUS".
Select "RESET". The initialization menu appears.
Start the engine, but do not begin to drive.
Start the Initialization with "RESET".
Drive vehicle. The initialization is completed during driving. "Status: active" is displayed.