GMC 2007 Acadia Owner's Manual page 285

If the ignition or radio is turned off, with a CD in
the player, it stays in the player. When the ignition
or radio is turned on, the CD starts playing
where it stopped, if it was the last selected audio
source. The CD is controlled by the buttons
on the radio faceplate or by the RSA unit. See
Rear Seat Audio (RSA) on page 322 for more
information. The DVD/CD decks, (upper slot is the
DVD deck and the lower slot is the CD deck) of
the radio are compatible with most audio CDs,
CD-R, CD-RW, and MP3s.
When a CD is inserted, the text label DVD or CD
symbol appears on the left side of the radio
display. As each new track starts to play, the
track number displays.
If playing a CD-R, the sound quality can 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. There can be an increase in skipping,
difficulty in finding tracks, and/or difficulty in loading
and ejecting. If these problems occur, check the
bottom surface of the CD. If the surface of the CD
is damaged, such as cracked, broken, or
scratched, the CD does not play properly. If the
surface of the CD is soiled, see Care of Your CDs
and DVDs on page 328 for more information.
If there is no apparent damage, try a known
good CD.
Notice: If a label is added to a CD, or more
than one CD is inserted into the slot at a time,
or an attempt is made to play scratched or
damaged CDs, the CD player could be
damaged. While using the CD player, use
only CDs in good condition without any label,
load one CD at a time, and keep the CD
player and the loading slot free of foreign
materials, liquids, and debris.
Do not add any label to a CD, it could get caught
in the CD player. If a CD is recorded on a
personal computer and a description label is
needed, try labeling the top of the recorded CD
with a marking pen.
If an error displays, see "CD Messages" later in
this section.
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