Chevrolet 2005 Astro Owner's Manual page 163

PWR (Power): Press this button to turn the system on
or off. The rear speakers will be muted when the
power is turned on.
VOL (Volume): Press this knob lightly so it extends.
Turn the knob to increase or to decrease the volume.
Push the knob back into it's stored position when
you are not using it. The upper knob controls the upper
headphones and the lower knob controls the lower
headphones.
AM FM: Press this button to switch between FM1,
FM2, or AM. If the front seat passengers are listening to
the radio, the RSA will not switch between the bands
or change the frequency.
Press AM FM to listen to the radio when a CD is
playing. The inactive CD will remain safely inside the
radio for future listening.
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SEEK : When listening to the radio, press the up
or the down arrow to go to the next or to the previous
station and stay there. This function is inactive if
the front seat passengers are listening to the radio.
To scan preset stations, press and hold either SEEK
arrow until SCAN appears on the radio display.
The radio will go to a station, play for a few seconds,
then go on to the next station. Press either SEEK arrow
again to stop scanning. This function is inactive if the
front seat passengers are listening to the radio.
When a CD is playing, press the up arrow to go to the
next track on the CD. Press the down arrow to go
to the start of the current track if more than eight
seconds have played. This function is inactive if the front
seat passengers are listening to a CD.
P.SET PROG (Preset Program): Press this button to
scan the preset radio stations set on the pushbuttons on
the main radio. The radio will go to a preset station,
play for a few seconds, then go on to the next preset
station. Press this button again to stop scanning.
This function is inactive if the front seat passengers are
listening to the radio.
TAPE CD: Press this button to play CD when listening
to the radio.
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