Cadillac 2011 DTS Owner's Manual page 251

Insert a CD partway into the slot, label side up. The
player pulls it in and the CD should begin playing.
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.
When a CD is inserted, the CD symbol displays. 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. Handle them
carefully. Store CD-R(s) in their original cases or other
protective cases and away from direct sunlight and
dust. The CD player scans the bottom surface of the
disc. If the surface of a CD is damaged, such as
cracked, broken, or scratched, the CD does not play
properly or not at all. Do not touch the bottom side of a
CD while handling it; this could damage the surface.
Pick up CDs by grasping the outer edges or the edge of
the hole and the outer edge.
If the surface of a CD is soiled, take a soft, lint free
cloth or dampen a clean, soft cloth in a mild, neutral
detergent solution mixed with water, and clean it. Make
sure the wiping process starts from the center to
the edge.
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.
The use of CD lens cleaners for CDs is not advised,
due to the risk of contaminating the lens of the CD
optics with lubricants internal to the CD player
mechanism.
If an error displays, see CD Messages later in this
section.
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