GMC 1998 Safari Owner's Manual page 170

Rear Seat Audio ( I f Equipped)
This feature allows rear seat passengers to listen to a
different music source than the front seat passengers
including AM-FM automatic tone control, cassette tapes
and CDs. For example, rear seat passengers may listen
to a cassette tape through headphones while the driver
listens to the radio through the front speakers. The rear
seat passengers have control of the volume for each
headphone. Be aware that the front seat audio controls
always override the rear seat audio controls.
Note that this feature is intended for rear seat passengers.
PWR: Press this button to turn the rear seat audio system
on or off. The rear speakers will be muted when the power
is turned on. You may operate the rear seat audio functions
even when the primary radio power is off.
VOL: Press this knob lightly so it extends. Turn the
knob to the right to increase volume and to the left to
decrease volume. Push the knob back into its stored
position when you're not using it. The upper VOL knob
controls the upper headphone and the lower VOL knob
controls the lower headphone.
AM-FM: Press this button to switch between
A M ,
FM1
and FM2. If the front passengers are already listening to
AM-FM, the rear seat audio controller will not switch
between the bands and cannot change the frequency.
SEEK: While listening to
A M - F M ,
press the up arrow
to tune to the next higher station and stay there. Press
the down arrow to tune to the next lower station and stay
there. The sound will mute while seeking. The SEEK
button is inactive if the AM-FM mode on the front radio
is in use.
While listening to a cassette tape, press the up arrow to
hear the next selection on the tape. Press the down arrow
to go back to the previous selection. The SEEK button is
inactive if the tape mode on the front radio is in use.
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