Whilst it's possibly been asked before, I need help as I'm stumped trying to fit an aftermarket head unit to my D2, basically, I bought the car recently and it came with an aftermarket head unit fitted, which seems to work (with sound, Bluetooth etc) however, I have bought a flip screen android head unit to fit and I'm struggling to get any sound. I can get it to power up but there is no sound! The car has the Harman Kardon speakers and amp fitted which seem to obviously work with the older head unit but not this new one. Is there an answer to this conundrum, I'm usually very good at fitting stereos but this one.......meh! Can anyone help or put me in the right direction please, it's doing my head in!