Pontiac 1999 Firebird - Manual (Page 165)

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Audio Steering Wheel Controls (If Equipped)
If your vehicle has this feature, you can control certain
radio and compact disc functions using the buttons on
your steering wheel.
VOLUME: Press the up or down arrow to increase or
decrease volume.
PLAY: Press this button to play a cassette tape or
compact disc when the radio is playing.
MUTE: Press this button to silence the system.
Press it again to turn on the sound.
SEEK: Press the up arrow to tune to the next radio
station and the down arrow to tune to the previous radio
station. If a cassette tape or compact disc is playing, the
player will advance with the up arrow and reverse with
the down arrow.
PRESET: Press this button to hear the radio stations
that are set on your pushbuttons. Pressing this button
while playing a tape will cause the tape to change sides.
If it is pressed while playing a CD, the CD random
feature can be turned off and on.
AM - FM: Press this button to select AM, FM1 or FM2.
If a cassette tape or compact disc is playing, the tape or
disc will stop playing and the radio will play. If this
button is pressed with a CD in the CD changer, the disc
will go to the next selection.