See also:

After the ignition is switched off
The roof can still be operated for approx. 1 minute, as long as no door has been opened. ...

Around the center console: controls and displays
1.  Coupe: microphone for voice activation systemand for telephonein hands-free mode Convertible: microphone on steering column 2.  SOS: initiating an Emergency Request call 3.  ...

Enabling operation in the rear
Only possible via the iDrive in the front. 1. "Settings" 2. "Allow rear control" 3. Select the desired priority. ...