2003 GMC Sierra 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. 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. the TRAF Press button. The radio will seek to a station that broadcasts traffic announcements. Whenthe 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 appearon the display. 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 volumeis muted or a compact disc is playing. 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. 3-77