2005 Chevrolet Cobalt Owner's Manual - Page 146
2005 Chevrolet Cobalt Manual
Page 146 highlights
To adjust the tone controls to the middle position, first end out of tone by pressing another button, causing the radio to perform that function, or by waiting five seconds for the display to return to the default display. Then press and hold the EQ button for more than two seconds until you hear a beep. CEN will appear on the display. To adjust the speaker controls to the middle position, first end out of balance and fade by pressing another button, causing the radio to perform that function, or by waiting five seconds for the display to return to the default display. Then press and hold the balance/fade button for more than two seconds until you hear a beep. CEN will appear on the display. Adjusting the Speakers (Balance/Fade) x w (Balance/Fade): To adjust the balance between the right and the left speakers, press and release the balance/fade button until BAL appears on the display. Then turn the ADJ knob to move the sound toward the right or the left speakers. To adjust the fade between the front and the rear speakers, press and release the balance/fade button until FADE appears on the display. Then turn the ADJ knob to move the sound toward the front or the rear speakers. To adjust the balance or the fade to the middle position, select BAL or FADE. Then press and hold the balance/fade button for more than two seconds. You will hear a beep and the level will be adjusted to the middle position. Radio Messages CAL (Calibration): The audio system has been calibrated for your vehicle from the factory. If CAL appears on the display it means that the radio has not been configured properly for your vehicle and must be returned to your GM dealer for service. LOCK: This message is displayed when the THEFTLOCK® system has locked up the radio. Take the vehicle to your GM dealer for service. If any error occurs repeatedly or if an error cannot be corrected, contact your GM dealer. 3-48