Cadillac 1999 Eldorado Owner's Manual page 166

You must first load the magazine with discs before you
can play a compact disc. Each of the 12 trays holds one
disc. Press the button on the back of the magazine and
pull gently on one of the trays. Load the trays from
bottom to top, placing a disc on the tray, label side
down. If you load a disc label side up, the disc will not
play and an error will occur. Gently push the tray back
into the magazine slot. Repeat this procedure for loading
up to 12 discs in the magazine.
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.
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Close the door by sliding it all the way to the left.
When the door is closed, the changer will begin
checking for discs in the magazine. This will continue
for up to one and a half minutes, depending on the
number of discs loaded.
To eject the magazine from the player, slide the CD
changer door all the way open. The magazine will
automatically eject. Remember to keep the door closed
whenever possible to keep dirt and dust from getting
inside the changer.
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