Chevrolet 2003 Silverado 1500 Pickup Owner's Manual page 232

INFO (Information): If the current station has a
message, the information symbol will appear on the
display. Press this button to see the message. The
message may display the artist and song title, call in
phone numbers, etc.
If the whole message is not displayed, parts of it will
appear every three seconds. To scroll through the
message at your own speed, press the INFO button
repeatedly. A new group of words will appear on
the display with each press. Once the complete
message has been displayed, the information symbol
will disappear from the display until another new
message is received. The old message can be displayed
by pressing the INFO button until a new message is
received or a different station is tuned to.
When a message is not available from an station,
NO INFO will be displayed.
TRAF (Traffic): Press this button to receive traffic
announcements. If the current tuned station does not
broadcast traffic announcements, the radio will seek to a
station that does. When the radio finds a station that
broadcasts traffic announcements, it will stop. TRAF will
appear on the display and when a traffic announcement
comes on you will hear it. If no station is found, NO
TRAF will appear on the display.
When a traffic announcement comes on the current
station or on a related network station, you will hear it,
even if the volume is muted or a compact disc is playing.
The traffic symbol and TRAF will appear on the display
while the announcement plays. If the compact disc player
was being used, play will stop during the announcement.
For DAB (Canada only, if your radio is equipped with
DAB), when the TRAF button is pressed, DAB does not
seek to a station that broadcasts traffic. DAB only checks
the current frequency for traffic support.
This function does not apply to XMTM Satellite Radio
Service.
Traffic Interrupt Feature: Your radio can interrupt the
play of a CD, or XMTM, or DAB station. Press the TRAF
button. The radio will seek to a station that broadcasts
traffic announcements. When the radio finds a station that
broadcasts traffic announcements, it will stop. TRAF will
appear on the display. When a traffic announcement
comes on the station that was found, you will hear it.
When the traffic announcement is over, the radio will
resume play of the CD, or XMTM, or DAB station. If no
station is found, NO TRAF will appear on the display.
Radio Messages
CAL ERR (Calibration Error): This message is
displayed when the radio has not been calibrated
properly for the vehicle. You must return to the
dealership for service.
LOCKED: This message is displayed when the
THEFTLOCK@ system has locked up. You must return
to the dealership for service.
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