I removed the old JVC HU from the rab, and re wired the harness for the Pioneer x3500ui. It lights up and everything, but i get no audio. I plugged the 3500 into the SCab and it works fine. I've rechecked my wiring 4 times, and my dad has twice. It all seems fine. What can be causing this? I have found next to nothing on google about it so far.