I've recently bought the Ford lead to go from the back of the factory radio to my phone car kit (AU2 19A442 C) so that I can repair the stuffed up install by a <i>professional</i> installer.

This lead has 3 wires, pink, light green and dark blue with yellow trace.

I've googled around and found mention of the pink being audio in and green being mute.

I suspect that the blue/yellow wire is the other side of the speaker circuit. Can anybody confirm this?