Hummer 2006 H3 Owner's Manual page 182

AUTO VOL (Automatic Volume): With automatic
volume, the audio system adjusts automatically to make
up for road and wind noise as you drive.
Set the volume at the desired level. Press this button to
select LOW, MEDIUM, or HIGH. Each higher setting
will allow for more volume compensation at faster
vehicle speeds. Then as you drive, automatic volume
increases the volume, as necessary, to overcome noise
at any speed. The volume level should always sound
the same to you as you drive. NONE will appear on the
display if the radio cannot determine the vehicle
speed. To turn automatic volume off, press this button
until AVOL OFF appears on the display.
Finding a Station
BAND: Press this button to switch between FM1, FM2,
AM, or XM1 or XM2 (if equipped). The display will
show the selection.
e (Tune): Turn this knob to select radio stations.
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o p
SEEK : Press and release the right or the left
arrow to go to the next or to the previous station
and stay there.
The radio will only seek stations with a strong signal
that are in the selected band.
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SCAN : Press and hold either arrow for more
than two seconds. SCN will appear on the display and
the radio will produce one beep. The radio will go to
a station, play for a few seconds, then go on to the next
station. Press either arrow again or one of the
pushbuttons to stop scanning presets.
The radio will only scan stations with a strong signal
that are in the selected band.
PSCAN (Preset Scan): Press and hold this button until
PSC will appear on the display and the radio will
produce two beeps. The radio will go to a preset station,
play for a few seconds, then go on to the next preset
station. Press either arrow again or one of the
pushbuttons to stop scanning presets.
The radio will only scan preset stations with a strong
signal that are in the selected band.