1997 GMC Sonoma Owner's Manual - Page 124

AM-FM Stereo with Cassette Tape Player and Equalizer (If Equipped) AM-ST Press this button to tune an AM station that broadcasts in stereo. Your STEREO light will come on when you're receiving AM stereo. If you press AM-ST and there is no more noise, it means the station is weak. You'll hear the station better if you do not use AM-ST. Press the button again to turn off stereo. Finding a Station AM-FM: Press the lower knob to switch between AM and FM. The display shows your selection. TUNE: Turn the lower knob to tune in radio stations. SEEK: Press this button to go to the next higher station and stay there. Playing the Radio PWR-VOL: This knob turns the system on and off and controls the volume. To increase volume, turn the knob clockwise. Turn it counterclockwise to decrease volume. RCL: Display the time with the ignition off by pressing this knob. When the radio is playing, press this knob to recall station frequency. SCAN: Press this button to listen to each station for a few seconds. The radio will go to the next station, stop for a few seconds, then go to the next station. SCAN will appear on the display. Press SCAN again to stop scanning. 3-10