1994 GMC Sonoma Owner's Manual - Page 121

How To Operate Your ETW AM Radio This part tells you how your ETR@AM radio works. Upper Knob (PWR-VOL-RECALL) The upper knob has four functions: 0 Rotate it to turn the system on and off. Rotate it to control the volume. Press it to display the time when the ignition is off. Press it to change between the clock and the radio station frequency displayed when the radio is on. 0 0 BAL (Balance) The control ring behind the upper knob adjusts the lefthight speaker balance. Lower Knob Rotate the lower knob to tune in radio stations. The control ring behind the lower knob is non-functional. Pushbuttons The four pushbuttonslet you return to favorite stations.You can set the pushbuttons forup to six favorite AM stations. Just: Tune in the station you want. Press the SET pushbutton. (SET appears in the VF display for a few seconds.) Within 5 seconds, push one of the four pushbuttons to store the station. Whenever you press that button, the preset station will return. 3-7