Cadillac 2002 DeVille Owner's Manual page 230

Glovebox-Mounted CD Changer (Option)
With the compact disc changer, you can play up to
six discs continuously. Normal size discs may be played
using the trays supplied in the magazine. The smaller discs
(8 cm) can be played only with specially designed trays.
You must first load the magazine with discs before you
can play a compact disc. Each of the six trays holds one
disc. Load the trays from bottom to top, placing a disc in
the tray label side up. If you load a disc label side down,
the disc will not play and an error will occur. Repeat this
procedure for loading up to 6 discs in the magazine.
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Once you have loaded the discs in the magazine, slide
open the door of the compact disc (CD) changer. Push
the magazine into the changer in the direction of the
arrow marked on top of the magazine.