2003 GMC Sonoma Owner's Manual - Page 184

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. Traffic Interrupt Feature: Your radio can interrupt the play of a cassette or CD. 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 or CD. If no station is found, NO TRAF will appear on the display. Playing a Cassette Tape Your tape player is built to work best with tapes that are up to 30 to 45 minutes long on each side. Tapes ionger 'than that are so thin they may not work weii in this player. The longer side with the tape visible should face to the right. If the ignition is on, but the radio is off, the tape can be inserted and will begin playing. A tape symbol is shown on the display whenever a tape is inserted. If you hear nothing but a garbled sound, the tape may not be in squarely. Press EJT to remove the tape and start over. While the tape is playing, use the VOL, AUDIO and SEEK controls just as you do for the radio. The display will show TAPE and an arrow showing which side of the tape is playing. If you want to insert a tape while the ignition is off, first press DlSP or EJT. if an error appears on the display, see "Cassette Tape Messages" later in this section. 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. 3-57