GMC 2004 Canyon Owner's Manual page 186

Playing a CD
The CD player can play the smaller 8 cm single CDs
with an adapter ring. Full-size CDs and the smaller CDs
are loaded in the same manner.
If playing a CD-R the sound quality may be reduced
due to CD-R quality, the method of recording, the quality
of the music that has been recorded, and the way the
CD-R has been handled. You may experience an
increase in skipping, difficulty in finding tracks and/or
difficulty in loading and ejecting. If these problems occur
try a known good CD.
Do not add paper labels to CDs, they could get caught
in the CD player.
Do not play 3 inch CDs without a standard adapter CD.
If an error appears on the display, see "CD Messages"
later in this section.
LOAD: Press the LOAD button to load CDs into the CD
player. This CD player will hold up to six CDs.
To insert one CD, do the following:
1. Turn the ignition on.
2. Press and release the LOAD button.
3. Wait for the light, located to the right of the slot, to
turn green.
4. Load a CD. Insert the CD partway into the slot,
label side up. The player will pull the CD in.
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When a CD is inserted, the CD symbol will appear on
the display. If you select an equalization setting for your
CD, it will be activated each time you play a CD.
As each new track starts to play, the track number will
appear on the display.
To insert multiple CDs, do the following:
1. Turn the ignition on.
2. Press and hold the LOAD button for two seconds.
You will hear a beep and the light, located to the
right of the slot, will begin to flash and LOAD
ALL will appear on the display.
3. Once the light stops flashing and turns green, load
a CD. Insert the CD partway into the slot, label side
up. The player will pull the CD in.
4. Once the CD is loaded, the light will begin flashing
again. Once the light stops flashing and turns green
you can load another CD. The CD player takes
up to six CDs. Do not try to load more than six.
To load more than one CD but less than six, complete
Steps 1 through 3. When you have finished loading
CDs, press the LOAD button to cancel the loading
function. The radio will begin to play the last CD loaded.