Subaru IMPREZA 2002 Owner's Manual page 171

Audio
Type B audio set (if equipped)
The radio will operate only when the ignition switch
is in the " ACC" or " ON" position.
J Radio operation
5-14
(1) FM button
(2) AM button
(3) SCAN button
(4) Tuning knob
(5) Preset buttons
(6) Fader/Balance selection button
(7) Power switch, Volume control,
Bass/Treble control and
Fader/Balance control dial
(8) Bass/Treble selection button
HS5004BB