So my radio on my 99 a6 quattro gave out on me and im attempting to install an aftermarket radio. Ive done a few installations on previous cars before so, just like this one i figured it would be a mater of buying a pre-made radio harness to plug into the factory one and wire it up to the radio. Ive got everything connected properly, tested my fuses and power outputs. The aftermarket JVC powers on but im not getting any sound. The wiring harness only uses the black and brown cluster harnesses. and the others are not being used at all. Anything im missing?