See also:

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

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. ...

Removing the remote control from the ignition lock
Do not forcibly pull the remote control out of the ignition lock Do not forcibly pull the remote control out of the ignition lock as this may cause damage.◀ Before removing the remote c ...