Just connected the pc9-404 to my Pioneer head unit, everything was fine, so went to push the head unit back into the dash and it went dead, I assumed a fuse had blown or I had caught a wire and pulled it out/broke it. Checked fuses both on head unit and in fuse box and both were fine and all wires behind the dash are all still in place. To test that it wasn't the after market head unit I plugged the standard Audi one in and was exactly the same. I'm stumped. Any help or suggestions would be greatly appreciated.