So I removed my HU-650 to replace with an aftermarket pioneer, my factory HU-650 only had the two wire harnesses plugged into the back(speakers and controls) and NOT any amp or MELBUS wires connected. I wired everything as I've found on the forums (only 4 wires on controls harness, yellow, blue, red, black) and wired the speaker harness accordingly, both using the scosche vo03b wiring harness. The problem is that I don't have any sound. The HU turns on and looks like it is working great, but I get no sound out. Does anybody have any ideas or suggestions for me to try?