Sorry - didn't get a chance to reply during the day.

I had a look last night and I don't think I have much help to offer. There's a lot of kit packed in there (it has changer, nav, phone, DSP, etc.) so all I can see is a muddle of wires and modules. Its not very clear what is connected to what.

I do see a couple of loose wires not connected to anything though, so I must check and see if there is anything that isn't working, but I don't think there is.