See also:

Volume control
Volume control You can adjust the phone call volume, the voice volume and the voice guidance volume. Refer to “Volume control buttons”. ...

Fuse panel located in the passenger compartment
...

MUTE button (if equipped)
Press this button if you wish to immediately cut the volume to zero. The audio display will show “MUTE”. If you press the button again, the original sound volume will return and “MUTE” turns off. ...