2003 GMC Sierra 1500 Pickup Owner's Manual - Page 244

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 XMTMSatellite Radio Service. Traffic Interrupt Feature: Your radio can interrupt the play of a cassette, 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 cassette, CD, or XMTM, DAB station. If no or 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@ systemhas locked up. You must return to the dealership for service. 3-89