GMC Jimmy 2004 Owner's Manual page 200

TRAF (Traffic): If TRAF appears on the display, the
tuned station broadcasts traffic announcements.
To receive the traffic announcement from the tuned
station, press this button. Brackets will be displayed
around TRAF and when a traffic announcement comes
on the tuned radio station you will hear it.
If the current tuned station does not broadcast traffic
announcements, press this button and the radio
will seek to a station that does. When the radio finds
a station that broadcasts traffic announcements,
the radio will stop and brackets will be displayed around
TRAF. When a traffic announcement comes on the
tuned radio station you will hear it. If no station is found,
NO TRAFFIC will appear on the display.
If the brackets are on the display and TRAF is not,
you can then press the TRAF button to remove
the brackets or use the TUNE knob or the SEEK arrows
to go to a station that supports traffic announcements.
If no station is found, NO TRAFFIC will appear on
the display.
Your radio will play the traffic announcement even if the
volume is low. Your radio will interrupt the play of a
CD if the last tuned station broadcasts traffic
announcements and the brackets are displayed.
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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 CD Z : Press the LOAD side of this button to
load CDs into the CD player. This CD player will
hold up to six CDs.