2009 GMC Savana Van Owner's Manual - Page 186

Radio Data System (RDS) The Radio may have a Radio Data System (RDS). The RDS feature is available for use only on FM stations that broadcast RDS information. This system relies upon receiving specific information from these stations and only works when the information is available. While the radio is tuned to an FM-RDS station, the station name or call letters displays. In rare cases, a radio station could broadcast incorrect information that causes the radio features to work improperly. If this happens, contact the radio station. Playing the Radio Radio with CD (MP3) shown, Radio with Six-Disc CD (MP3) similar The vehicle has one of these radios as its audio system. O (Power/Volume): Press to turn the system on and off. Turn clockwise or counterclockwise to increase or decrease the volume. When the radio is turned on, it plays at the volume level that was last set. The volume can be adjusted using this knob. 3-68