<http://forums.vwvortex.com/zerothread?id=424779> Here is a VWVortex forum thread, I pull it out to show PIN #4 on the K/S box as the test port. Now, all cars (depending on year & model) will have different colored wires, so keep that in mind. Somewhere down in the thread is the Bentley procedure, for those of us without later Bentleys to refer to. hth, TBerk