Chevrolet 2002 Astro Owner's Manual page 167

Set the volume at the desired level. Press this button to
select LOW, MEDIUM or HIGH. AVOL will appear on
the display. Each higher volume setting allows 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. If you don't want to use
automatic volume, select OFF.
Finding a Station
AM FM: Press this button to switch between AM, FM1
and FM2. The display will show your selection.
A "
TUNE : Turn this knob to choose radio stations.
A "
SEEK : Press the right or left arrow to seek to
the next or previous station and stay there. The radio
will seek to stations with a strong signal only. The
sound will mute while seeking.
3-18
A "
PSCAN (Preset Scan): Press and hold one
of the arrows for more than two seconds. The radio will
produce one beep. The radio will scan to the first preset
station stored on your pushbuttons, play for a few
seconds, then go on to the next station. Press one of the
arrows or one of the pushbuttons again to stop scanning.
SCAN will be displayed whenever the tuner is in the
preset 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. The radio will scan to stations with a
strong signal only. The sound will mute while scanning.
Setting Preset Stations
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 AM, FM1 or FM2.