Mercedes-Benz G-Class 2020 Operator's Manual page 247

Switching the sound on/off
On the multifunction steering wheel
On the multimedia system
To mute: press volume control 1.
#
The 8 symbol appears in the status line
of the media display.
You will also hear traffic announcements and
navigation announcements even when the
sound is muted.
Multimedia system 245
To switch on: change the media source or
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turn volume control 1.
Adjusting the volume
Setting with the volume control
On the multifunction steering wheel