See also:

Malfunction
In the event of a failure or malfunction of the parking brake, secure the vehicle against rolling using a wheel chock, for example, when leaving it. ...

iDrive in the rear
Operation is the same as for the iDrive in the front. To adjust the volume: turn, arrows 1. To activate the controller and switch between the screens: press the buttons, arrows 2. ...

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