GMC 2004 Envoy Owner's Manual page 203

TRAF (Traffic): If TRAF appears on the display,
the tuned station broadcasts traffic announcements and
when a traffic announcement comes on the tuned
radio station you will hear it.
If the station does not broadcast traffic announcements,
press the TRAF 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 seeking and TRAF will appear on the display. If no
station is found that broadcasts traffic announcements,
NO TRAFFIC will appear on the display.
If TRAF is on the display, press the TRAF button to turn
off the traffic announcements.
The radio will play the traffic announcement even if the
volume is low. The radio will interrupt the play of a
cassette tape or CD if the last tuned station broadcasts
traffic announcements.
This function does not apply to XM™ Satellite Radio
Service.
Radio Messages
CAL ERR (Calibration Error): The audio system
has been calibrated for your vehicle from the factory.
If CAL ERR appears on the display, it means that
the radio has not been configured properly for the
vehicle and must be returned to the dealer for service.
LOCKED: This message is displayed when the
®
THEFTLOCK system has locked up. Take the vehicle
to the dealer for service.
If any error occurs repeatedly or if an error cannot be
corrected, contact your dealer. If the radio displays
an error message, write it down and provide it to your
dealer when reporting the problem.
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