GMC 1997 Safari Owner's Manual page 170

Playing a Compact Disc in the Single Remote Disc
Player (If Equipped)
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 halfway). The disc will automatically be
pulled into the player. If the radio is off and the ignition
is on when a CD is inserted, the radio will turn on and
begin playing the CD. It is possible to load and unload
CDs 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.
If the disc comes back out and ERR appears on the
display,
it
could be that:
0
The disc is upside down.
0
It is dirty, scratched or wet.
0
There's too much moisture in the air. (Wait about an
hour and try again.)
0
You are driving on a very rough road.
Please contact your dealership if any error recurs or
cannot be corrected.