I had a similiar problem with my CSVT 98 with the speakers. they didnt work. With the radio out of the car, but conncted to power, gound and remote, I connected a set of speaker wires to each of the speakers and all the speakers worked, and all the leads off the radio transmitted a signal. I followed the wires to a small underdash amplifier that had no ohms (it was bad), I bypassed the amp by determining the speaker leads and all is well. It isnt quite as loud, but they all work, fade, balance etc. I am not sure if your model will have the same thing, but after you check the simple stuff ie, ground, power, etc, check the amp. Good luck, hope this helps.