Installation worked right away, all the necessary parts were present and have passed (Passat 3C). A little electrical experience but you should have, because unfortunately VW changes obviously often times the circuitry (actually an impertinence, but the other car manufacturers making probably the same). Therefore, it should be measured prior to installing the adapter necessarily multimeter. Speakers have voted, but ignition and continuous voltage were compared with ISO wiring reversed. The measuring is but for all adapters necessary because there are probably many vehicle manufacturers and perhaps radio manufacturer with imaginative wirings. Therefore, of course, no point deduction.
