See also:

Deactivating HDC
Press the button again; the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

Opening the main menu
Press the button. The main menu is displayed The main menu is displayed. All iDrive functions can be called up via the main menu. ...

Having possible commands read aloud
You can have the available commands read out loud for you: ›Voice commands‹ For example, if the "Settings" menu is displayed, the commands for the settings are read out loud. ...