Mercedes-Benz S-Class 2019 Operator's Manual page 286

284 Multimedia system
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.
To switch on: change the media source or
#
turn volume control 1.
Adjusting the volume
On the multifunction steering wheel