GMC 2004 Sierra 1500 Pickup Owner's Manual page 243

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SCAN : Press and hold either arrow for more
than two seconds. SCAN will appear on the display and
you will hear a beep. The radio will go to a station,
play for a few seconds, then go on to the next station.
Press either arrow again to stop scanning.
To scan preset stations, press and hold either arrow for
more than four seconds. PSCN will appear on the
display and you will hear two beeps. The radio will go to
the first 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.
The radio will scan only to stations that are in the
selected band and only to those with a strong signal.
Setting Preset Stations
The six numbered pushbuttons let you return to your
favorite stations. You can set up to 30 stations
(six FM1, six FM2, and six AM, six XM1 and six XM2
(48 contiguous US states, if equipped), 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.
4. Press AUTO EQ to select the equalization.
5. Press and hold one of the six numbered
pushbuttons. The radio will produce one beep.
Whenever you press that numbered pushbutton, the
station you set will return and the equalization
that you selected will be automatically stored for
that pushbutton.
6. Repeat the steps for each pushbutton.
Setting the Tone (Bass/Treble)
AUDIO: Push and release the AUDIO knob until BASS
or TREB appears on the display. Turn the knob to
increase or to decrease. The display will show the bass
or treble level. If a station is weak or noisy, you may
want to decrease the treble.
To adjust the bass and treble to the middle position,
push and hold the AUDIO knob. The radio will produce
one beep and adjust the display level to the middle
position.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. ALL will appear on
the display, you will hear a beep and the display level
will be adjusted to the middle position.
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