2005 Pontiac Aztek Owner's Manual - Page 212

If the current tuned station does not broadcast traffic announcements, press the TRAF button and the radio will seek to a station that does. When a station that broadcasts traffic announcements is found, the radio will stop seeking and brackets will be displayed around TRAF. If no station is found, NO TRAFFIC will appear on the display. If the brackets are on the display and TRAF is not, press the TRAF button to remove the brackets or use the TUNE knob or the SEEK arrows to go to a station that supports traffic announcements. If no station is found that broadcasts traffic announcements, NO TRAFFIC will appear on the display. The radio will play the traffic announcement if the volume is low. The radio will interrupt the play of a CD if the last tuned station broadcasts traffic announcements and the brackets are displayed. 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 it must be returned to your GM dealer for service. LOCKED: This message is displayed when the THEFTLOCK® system has locked up. Take your vehicle to your GM dealer for service. If any error occurs repeatedly or if an error cannot be corrected, contact your GM dealer. 3-90