GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 298

Playing an MP3/WMA (In Either the DVD or
CD Slot)
Insert a CD-R or CD-RW partway into either the top or
bottom slot, label side up. The player pulls it in, and
the CD-R or CD-RW should begin playing.
Depending on the format of the disc, a softkey menu
appears and allows navigation of the disc. The menu
reads left to right as RDM (Randomize song play order), a
Folder icon with left and right arrows (to move up or down
through available folders), a PL tag if the disc has a
Playlist available, and a Music Navigator tag. If a Playlist
tag is shown, toggling this key brings up a Folder softkey
only or the menu as previously described.
If the ignition or radio is turned off with a CD-R or CD-RW
in the player it stays in the player. When the ignition or
radio is turned back on, the CD-R starts to play where it
stopped, if it was the last selected audio source.
As each new track starts to play, the track number and
song title displays.
Z CD (Eject): Press and release this button to eject
the CD-R or CD-RW that is currently playing in the
bottom slot. A beep sounds and Ejecting Disc displays.
Once the disc is ejected, Remove Disc displays. The
CD-R or CD-RW can be removed. If the CD-R or
CD-RW is not removed, after several seconds, the CD-R
or CD-RW automatically pulls back into the player.
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If loading and reading of a CD cannot be completed,
such as unknown format, etc., and the disc fails to eject,
press and hold this button for more than five seconds
to force the disc to eject.
Z DVD (Eject): Press and release this button to eject
the CD-R or CD-RW that is currently playing in the top
slot. A beep sounds and Ejecting Disc displays. Once the
disc is ejected, Remove Disc displays. The CD-R or
CD-RW can be removed. If the CD-R or CD-RW is not
removed, after several seconds, the CD-R automatically
pulls back into the player. If loading and reading of a CD
cannot be completed, such as unknown format, etc., and
the disc fails to eject, press and hold this button for more
than five seconds to force the disc to eject.
f
(Tune): Turn this knob to select MP3/WMA files on
the CD-R or CD-RW that is currently playing.
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SEEK : Press the left SEEK arrow to go to the
start of the current MP3/WMA file, if more than
five seconds have played. If less than five seconds have
played, the previous MP3/WMA file plays. Press the right
SEEK arrow to go to the next MP3/WMA file. If either
SEEK arrow is held, or pressed multiple times, the player
continues moving backward or forward through the
MP3/WMA files on the CD.