See also:

The concept
The automatic engine start-stop function helps save fuel. The system switches off the engine during a stop, e. g., in a traffic congestion or at traffic lights. The ignition remains switched on. ...

Automatic-Transmission
Starting the engine 1. Depress the brake pedal. 2. Press the Start/Stop button. The ignition is activated automatically for a certain time and is stopped as soon as the engine starts. ...

Switching the system on/off
Press the left or right side of the button on the CD/DVD player in the rear for the respective page. Rear entertainment and screens are switched on/off. After switching off the ignition, ...