Adjustable level of each volume
Subaru Impreza / Subaru Impreza Owners Manual / Audio / Hands-free system (if equipped) / Using the Hands-free system / Adjustable level of each volume

See also:
Horn
To sound the horn, push the horn pad. ...
Operation
The SRS side airbag and SRS curtain airbag can function only when the ignition
switch is in the “ON” position.
The driver’s and front passenger’s SRS side airbags and SRS curtain airbags deploy
...
Deactivating the REV alarm system
To deactivate the REV indicator light and buzzer functions of the REValarm system, set the thousands place of the alarm-level engine speed to “–”. ...
