2002 GMC Sonoma Owner's Manual - Page 202

Finding a PTY Station P-TYPE (Program Type): This button is used to turn on and off Program Type (PTY) selections. PTY and the light next to the button will turn on. The last selected PTY will appear on the display for five seconds. Turn the P-TYPE knob to select the PTY you want to listen to. Press the SEEK arrows to find radio stations for the PTY you want to listen to. The last PTY selected will be used for seek or scan modes. If a station with the selected PTY is not found, NONE FOUND will appear on the display. If both P-TYPE and TRAF are on, the radio will search for stations with traffic announcements and the selected PTY. To use the PTY interrupt feature, press and hold the P-TYPE button until you hear a beep on the PTY you want to interrupt on. When you are listening to a compact disc, the last selected RDS FM station will interrupt play if that selected program type format is broadcast. AM FM (Alternate Frequency): Alternate frequency allows the radio to switch to a stronger station with the same program type. Press and hold AM FM for two seconds to turn alternate frequency on. AF ON will appear on the display. The radio may switch to stronger stations. Press and hold AM FM again for two seconds to turn alternate frequency off. AF OFF will appear on the display. The radio will not switch to other stations. When you turn the ignition off and then on again, the alternate frequency feature will automatically be turned on. Setting PTY Preset Stations The six numbered pushbuttons let you return to your favorite PTYs. These buttons have factory PTY presets. You can set up to 12 PTYs (six FM1 and six FM2) by performing the following steps: 1. Press AM FM to select FM1 or FM2. 2. Press P-TYPE to activate program type mode. 3. Turn the P-TYPE knob to select a PTY. 4. Press and hold one of the six numbered pushbuttons until you hear a beep. Whenever you press that numbered pushbutton, the PTY you set will return. 5. Repeat the steps for each pushbutton. 3-48