2002 GMC Sonoma Owner's Manual - Page 176

SCV (Speed-Compensated Volume): With SCV, your audio system adjusts automatically to make up for road and wind noise as you drive. Set the volume at the desired level. Turn the control ring behind the upper knob clockwise to adjust the SCV. Each notch on the control ring allows for more volume compensation at faster vehicle speeds. Then, as you drive, SCV automatically increases the volume, as necessary, to overcome noise at any speed. The volume level should always sound the same to you as you drive. If you don't want to use SCV, turn the control all the way down. RECALL: Pressing this button will display the station being played or it will display the clock. Clock display is available with the ignition turned off. Finding a Station AM FM: Press this button to switch between AM, FM1 and FM2. The display will show your selection. TUNE: Press this knob lightly so it extends. Turn it to choose radio stations. Push the knob back into its stored position when you're not using it. SEEK : Press the right or left arrow to seek to the next station or previous station and stay there. The radio will seek to stations with a strong signal only. The sound will mute while seeking. To scan stations, press and hold either SEEK arrow for two seconds until SCAN appears on the display. The radio will scan to a station, play for a few seconds, then go on to the next station. Press either SEEK arrow again to stop scanning. The radio will scan to stations with a strong signal only. The sound will mute while scanning. P.SCAN (Preset Scan): Press this button to scan through your favorite stations stored on your pushbuttons. P.SCAN will appear on the display. The radio will scan to the first preset station stored on your pushbuttons, play for a few seconds, then go on to the next station. Press this button again or one of the pushbuttons to stop scanning. The channel number (P1 through P6) will appear with the frequency. The radio will scan preset stations with a strong signal only. The sound will mute while scanning. 3-22