Hummer 2007 H3 Owner's Manual page 216

Radio Messages
CAL ERR (Calibration Error): The audio system
has been calibrated for your vehicle from the
factory. If CAL ERR displays it means that
the radio has not been configured properly for
your vehicle and it must be returned to your
dealer for service.
LOC (Locked): This message is displayed
when the THEFTLOCK
Take your vehicle to your dealer for service.
If any error occurs repeatedly or if an error cannot
be corrected, contact your dealer.
Radio Messages for XM™ Only
See XM Radio Messages on page 228 later in
this section for further detail.
Playing a CD
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.
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system has locked up.
When a CD is inserted, READING and the CD
symbol appears on display. As each new
track starts to play, the track number appears
on the display.
The CD player can play the smaller 3 inch (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. There may 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 will not play properly. If the
surface of the CD is soiled, see Care of Your CDs
on page 231 for more information.
If there is no apparent damage, try a known
good CD.