If someone has been there and cut-off the loom connectors and all you've got is wires - sounds like that's what you're saying, you may as well connect an ISO plug to these flying leads (ISO plug to flying leads can be bought at Halfords) and that'll then connect to pretty much any modern Headunit, including Sony's, my experience of Sony's is they have an ISO socket on the back of the HU. Connect the flying leads with crimp connectors or for a more professional approach solder and use a heatshrink sleeve on each.
The wire colours on the loom may follow the standard scheme, they may not - that I don't know, they're relatively easy to buzz out with a multi-meter basically you're looking 12v on all the time, 12v on when igntion on, at least one earth - i.e. short to vehicle, the antenna which should be coax, and 4 pairs of speaker wires which are usually striped. I've got the colours for a VII (who knows if that's the same as a III?), I'm trying to find a diagram for the standard scheme for ISO connector as well. It wouldn't be too difficult to work it through though.
Brian.
The wire colours on the loom may follow the standard scheme, they may not - that I don't know, they're relatively easy to buzz out with a multi-meter basically you're looking 12v on all the time, 12v on when igntion on, at least one earth - i.e. short to vehicle, the antenna which should be coax, and 4 pairs of speaker wires which are usually striped. I've got the colours for a VII (who knows if that's the same as a III?), I'm trying to find a diagram for the standard scheme for ISO connector as well. It wouldn't be too difficult to work it through though.
Brian.
