GMC Sierra Denali Classic 2007 Owner's Manual page 242

You must load CDs with the label side up. If you
do not, the player will automatically eject the CDs.
Notice: Loading CDs with adhesive labels
will damage the player.
To load a CD, perform the following steps:
1. Press the LOAD button. Available positions
will blink green.
2. Select a position by pressing the numbered
button with the green blinking light. If a button
is not pressed within five seconds, the changer
will go to the lowest available position.
3. Load the CD when the loading slot indicators
turn green. An internal door will open allowing
a single CD to be inserted into the changer.
After approximately 10 seconds the changer
will be ready to play.
To load two or more CDs, perform the
following steps:
1. Press and hold the LOAD button. The first CD
will be loaded into the lowest numbered
empty position.
2. Load a single CD when the loading slot
indicators turn green. After about 10 seconds
the changer will cycle to the next available
position.
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3. Repeat Step 2 until all CDs are loaded into all
of the desired positions. If you do not wish to
load all of the positions, cancel loading by
pressing and releasing the load button or wait
25 seconds for the changer to time out.
To eject a single CD, perform the following steps:
1. Press the eject button (upward pointing arrow).
The buttons with loaded CDs will blink green.
2. Press one of the green blinking buttons to
select the location of the CD you want to
eject. The changer will move to that location
and eject the CD. If you do not remove the CD
from the player within 25 seconds, it will be
reloaded. If the eject button is pressed and a
numbered location button is not pressed
within five seconds, the current or last played
CD will be ejected.
To eject all CDs, press and hold the eject button.