Chevrolet 2006 TrailBlazer EXT Owner's Manual page 240

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SCAN : Press and hold either the SCAN or the
TYPE arrows for two seconds until SCAN appears
on the display and you hear a beep. The radio will go to
a station, play for a few seconds, then go on to the
next station. Press either the SCAN or the TYPE arrows
again to stop scanning.
To scan preset stations, press and hold either the
SCAN or the TYPE arrows for more than four seconds.
PSCN will appear on the display and you will hear a
double beep. The radio will go to a preset station, play
for a few seconds, then go on to the next preset
station. Press either the SCAN or the TYPE arrows
again to stop scanning presets.
The radio will only scan stations with a strong signal
that are in the selected band.
Setting Preset Stations
Up to 30 stations (six FM1, six FM2, and six AM,
six XM1 and six XM2 (if equipped)), can be programed
on the six numbered pushbuttons, by performing the
following steps:
1. Turn the radio on.
2. Press BAND to select FM1, FM2, AM, or XM1
or XM2.
3. Tune in the desired station.
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4. Press and hold one of the six numbered
pushbuttons until you hear a beep. Whenever that
numbered pushbutton is pressed, the station
that was set will return for that pushbutton.
5. Repeat the steps for each pushbutton.
To store an equalization setting to a preset station
perform the following:
1. Tune to the preset station.
2. Press and release the AUTO EQ button to select
the equalization setting.
Once the equalization no longer appears on
the display, the equalization will be set for that
preset station.
Setting the Tone
(Bass/Midrange/Treble)
AUDIO: Push and release the AUDIO knob until BASS,
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MID (without Bose ), or TREB appears on the display.
Turn the knob to increase or to decrease. The display
will show the bass, midrange (without Bose
level. If a station is weak or noisy, decrease the treble.
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), or treble