Chevrolet 2006 TrailBlazer EXT Owner's Manual page 224

For XM™ (if equipped), press the DISPL knob while
in XM™ mode to retrieve four different categories
of information related to the current song or channel:
Artist, Song Title, Category or PTY, Channel
Number/Channel Name.
To change the default on the display, press the DISPL
knob until you see the display you want, then press
and hold this knob for two seconds. The radio will
produce one beep and the selected display will now be
the default.
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. AVOL will appear
on the display. 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 OFF
appears on the display.
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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.
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TUNE : Turn this knob to select radio stations.
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SEEK : Press 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. SCAN 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.
To scan preset stations, press and hold either arrow
for more than four seconds. PSCN 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 stations with a strong signal
that are in the selected band.