I foolishly bought a satnav/dvd double din head unit yesterday.

after looking at the harness from it today it looks like its been setup to connect straight into a vw golf, and has a can bus adapted attached via a few wires.

Is it possible that the can bus will work with my a4? or if dont can i imply unclip it?

Im thinking of cutting the wires from the vw connector and adding them to an iso block, which seems straightforward apart from 2 wires, a green one and a purple one that come from the can bus, any idea what they might be?

any help appreciated
Kev