GMC 1996 Sierra Owner's Manual page 145

CD Adapter Kits
Although this is not a recommended practice, it is possible
to use a CD
adapter kit with your cassette tape player.
The adapter kit cassette should begin playing like a
regular audio cassette tape once inserted. If the cassette
immediately ejects, turn the radio off, turn the ignition on
and press and hold the TAPE AUX button until the tape
icon flashes on the display. Insert the adapter cassette
again. It will power up the radio and begin playing.
This override routine will remain active until the EJECT
button is pressed.
Playing a Compact Disc in the Single Remote
Disc Player
If
you
have this option, you can play one compact disc
(CD) at a time.
To load a CD into the player, hold the disc with the
label side up and insert it carefully into the player
(approximately half way). The disc will autolnatically
be pulled into the player. If the radio is off and the
ignition is o n when a CD is inserted, the radio will turn
on and begin playing the CD. It is possible to load and
unload CD's with the ignition off. To load a disc with
the ignition off, press the EJECT button on the remote
player and then insert the disc. To remove the disc, press
the EJECT button and remove the disc from the player.
A disc that has been ejected but is still sitting in the
remote CD player will be pulled back into the player
after approximately 30 seconds. This protects the disc
and player from damage. The disc will not start playing.
To remove the disc, press the EJECT button and remove
the disc from the player.
All of the compact disc functions are controlled by the
radio buttons except for EJECT. When a disc is in the
player, a CD symbol will appear on the display. When a
disc is playing,
the
letters CD will appear next to the CD
symbol in the bottom left corner. The track number will
also be displayed.
3-15