If there are only three wires, then nothing in the car is diagnostics-capable.
If your car has the old, check if there is a wire going to each pin, as shown in the picture. If there are four wires, VCDS should work with any diagnostics-capable modules that are present. If your VW or Audi has a, VCDS will definitely work.
It will also work with most late-model, and models sold in markets other than North America. It will work with some cars all the way back to model year 1990. F.A.Q Frequently Asked Questions - VCDS and VCDS-Mobile will work with most and models sold World-Wide 1994 through the current model year.
