The concept

Pressing the Start/Stop button switches the ignition on or off and starts the engine.
Automatic transmission: the engine starts if the brake is depressed when the Start/Stop button is pressed.
Manual transmission: the engine starts if the clutch is depressed when the Start/Stop button is pressed.
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. ...
Switching off the engine
Always take the remote control with you when
you leave the vehicle.
When parking, apply the parking brake forcefully; otherwise, the vehicle could
begin to roll.
Manual transmission1. Wit ...
Switching on automatically
Select transmission position R with the engine
running.
The Top View and PDC images are displayed if
the system is switched on via iDrive. ...
