I just installed a Sony aftermarket radio into my Crossfire Coupe, Ive got the correct harness and connected all the wires to the correct color. The harness had a leftover wire for the Remote out, which I assume turns on the cars built in sub, however I didn't find an extra wire coming from the crossfire that would power that! Any ideas where this would be? Or any other explanation why no sound comes out, not even static?