Pontiac 1998 Trans Sport Owner's Manual page 239

Rear Seat Audio (If 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
or CDs. For example, rear seat passengers may listen to
a cassette tape or CD 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.
The following function is controlled by the primary
radio knob:
POWER-VOL: Push this
knob twice to turn the rear
seat audio system on or off. ON or OFF will be
displayed for five seconds. The rear speakers will be
muted when the power is turned on. You may operate
the rear seat audio functions when the primary radio
power is off if the ignition is on.
The following functions are controlled by the rear seat
audio system buttons:
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.
VUL: Press this' knob lightly so it extends. Turn
the
knob to the right to increase volume and to the left to
decrease volume. Bush 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,
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