Chevrolet 2001 Impala Owner's Manual page 202

Finding a Station
AM FM: Press this button to switch between AM,
FM1 and FM2. The display shows your selection.
TUNE: Turn this knob to choose radio stations.
SEEK: Press the right arrow to tune to the next higher
station and the left arrow to tune to the next lower
station and stay there. The radio will seek to stations
with a strong signal only.
PUSHBUTTONS: The six numbered pushbuttons
let you return to your favorite stations. You can set up
to 18 stations (six AM, six FM1 and six FM2) by
performing the following steps:
1. Turn the radio on.
2. Press AM FM to select the band.
3. Tune in the desired station.
4. Press AUTO TONE to select the equalization that
best suits the type of station selected.
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5. Press and hold one of the six numbered buttons. The
radio will beep once to confirm. Whenever you press
that numbered button, the station you set will return
and the AUTO TONE equalization that you selected
will also be automatically selected for that button.
6. Repeat the steps for each pushbutton.
P SCAN: Press and hold one of the arrows for more
than two seconds. The radio will beep once to confirm.
Use P SCAN to listen to each of your favorite stations
stored on your pushbuttons for a few seconds. The radio
will scan through each of the stations stored on your
pushbuttons, except those stations with weak reception.
The AUTO TONE setting stored for that pushbutton will
be automatically chosen. Press P SCAN or one of the
pushbuttons again to stop scanning. SCAN will be
displayed whenever the tuner is in the P SCAN mode.
The channel number (P1 through P6) will appear with
the frequency. In FM mode, this function will scan
through the current band such as FM1 or FM2.