2005 GMC Envoy Owner's Manual - Page 214

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, song title, call in phone numbers, etc. If the entire message is not displayed, parts of the message will appear every three seconds. To scroll through the message, press and release the INFO button. A new group of words will appear on the display after every press of this button. Once the complete message has been displayed, the information symbol will disappear from the display until another new message is received. The last message can be displayed by pressing the INFO button. You can view the last message until a new message is received or a different station is tuned to. When a message is not available from a station, NO INFO will appear on the display. TRAF (Traffic): If TRAF appears on the display, the tuned station broadcasts traffic announcements and when a traffic announcement comes on the tuned radio station you will hear it. If the 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 TRAF will appear on the display. If no station is found that broadcasts traffic announcements, No Traf will appear on the display. If TRAF is on the display, press the TRAF button to turn off the traffic announcements. 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. 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 your 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. 3-78