GMC 1997 Safari Owner's Manual page 165

SCAN: Press and hold SEEK until the radio goes
into
SCAN mode. SCAN allows you to listen to stations for
a few seconds. The receiver will continue to scan and
momentarily stop at each station until you press
SEEK again.
P.SET PROG: The front passengers must be listening
to something different for each of these three functions
to work:
0
Press this button to seek through your preset radio
stations set on your primary radio pushbuttons.
When a cassette tape is playing, press this button to
go to the other side of the tape.
TAPE CD: With a cassette tape in the player and the
radio playing, press this button to play a cassette tape.
Press AM-FM
to
return to the radio when a cassette tape
is playing. The inactive tape will remain safely inside
the
radio for
future listening.
AM-FM Stereo with Compact Disc Player
and Automatic Tone Control (If Equipped)
I
I
Playing the Radio
PWR-VOL: Press this knob to turn the system on and
off. To increase volume, turn this knob clockwise. Turn
it
counterclockwise to decrease volume. The knob is
capable of rotating continuously.
RECALL: Display the time with the ignition off by
pressing this button. When the radio is playing, press
this button to recall the station frequency.