2002 GMC Sonoma Owner's Manual - Page 166

To adjust the treble, press and release AUDIO until TRE appears on the display. Then press and hold the up arrow to increase treble. T and a positive number will appear on the display. Press and hold the down arrow to decrease treble. T and a negative number will appear on the display. T and a zero will appear on the display when the treble level is adjusted to the middle position. Release the up or down arrow when you find the treble level you want or when the maximum or minimum level is reached. If a station is weak or noisy, you may want to decrease the treble. To adjust bass or treble to the middle position, select BAS or TRE. Then press and hold AUDIO for more than two seconds until you hear a beep. B and a zero or T and a zero will appear on the display. To adjust both tone controls and both speaker controls to the middle position, end out of audio mode by pressing the AUDIO button until the display goes blank. Then press and hold AUDIO for more than two seconds until you hear a beep. CEN will appear on the display. Adjusting the Speakers (Balance/Fade) AUDIO: To adjust the balance between the right and left speakers, press and release AUDIO until BAL appears on the display. Then press and hold the up arrow to move the sound to the right speakers or the down arrow to move the sound to the left speakers. R and a number will appear on the display when the sound is balanced toward the right speakers. L and a number will appear on the display when the sound is balanced toward the left speakers. L and a zero will appear on the display when the sound is balanced between the speakers. Release the up or down arrow when you find the speaker balance you want or when the maximum or minimum level is reached. To adjust the fade between the front and rear speakers, press and release AUDIO until FAD appears on the display. Then press and hold the up arrow to move the sound to the front speakers or the down arrow to move the sound to the rear speakers. F and a number will appear on the display when the sound is balanced toward the front speakers. R and a number will appear on the display when the sound is balanced toward the rear speakers. F and a zero will appear on the display when the sound is balanced between the speakers. Release the up or down arrow when you find the speaker balance you want or when the maximum or minimum level is reached. 3-12