hmm that'* interesting. But when i switched the tuners, i had to break the manufacturer'* sticker connecting each one to the faceplate which makes me think neither unit had been tampered with, unless the sticker was a repair sticker. What makes me doubt this would ever work is that the steering wheel button wire, light green, plugs into the auxillary plug on that back, not into the tuner itself. I traced this wire to the circuit board perpendicular to the faceplate, but i could not trace it any farther. I tried to swap that circuit board between the two radios but could not get the fader/balance ***** off.
Did the buick or grand am have a mute button instead of a power button on the wheel?