GMC 2005 Sierra Denali Owner's Manual page 202

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 amber.
2. Select a position by pressing the numbered button
with the amber 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
amber. 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 amber. 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 a
button with a green flashing indicator light or wait
20 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 amber.
2. Press one of the amber 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 10 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.
To play a CD, perform one of the following:
•
With the radio on, press the numbered button with
a green indicator light on the CD changer.
•
Press the TAPE CD button on the radio. The CD
changer will go to its last played position.