I am replacing my Audi Concert, rear amplified, with a Sony DSX-A40UI (Halfords | Sony DSX-A40UI Radio with iPod/iPhone, AUX & USB connectivity). I removed the Concert stereo and connected the car wiring up to a PC9-404 and an amplified ISO adaptor. There remains a single brown connector which was screwed into the back of the Concert. What is this and where should it go? There is a blue wire coming out of the amplified ISO adaptor. Where should this go? The aerial adaptor doesn't fit into the back of my new stereo, I must need another adaptor but other than that sounds comes out of the speakers and when I take the key out of the ignition the stereo turns off. However the stereo is not storing memory so I guess I am missing a permanent live connection? Surely there was one for the old Concert? What to do? Thanks for any help - this is another 10 minute job that is taking all day!