See also:

Sound output
Switching on/off When the ignition is switched off: press ON/OFF button on the radio. Muting When the ignition is switched on or the engine is running: press the ON/OFF button on the radio. ...

Adjusting the volume
Adjusting the volume Turn the knob until the desired volume is selected. The setting is stored for the remote control currently in use. The vehicle automatically adjusts the volume of the mic ...

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. ...