In reply to:

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But I think you're probably better off just going with an aftermarket deck unit and not even bothering with the VW single-DIN.

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For what it's worth, I replaced the double-DIN Monsoon in my 2002 Jetta (same interface as the R32) with the previous year's VW single-DIN Monsoon and plugged a VWCDPIC into the CD changer connector in the rear. With the purchase of a few VW factory parts (connector housings for the back of the single-DIN, some repair wires), an aftermarket adapter for the harness, and a little creative soldering, I have the single-DIN radio not only functioning beautifully (including correct dimming with the car's interior illumination) but also responding properly to diagnostic commands over the car's diagnostic interface. The only thing that doesn't work is the volume/track control on the steering wheel (I haven't yet replaced my multifunction steering wheel controller with the one from the earlier model car, which I think would fix this problem - but it's an expensive experiment to do if it doesn't, as those run about $200 new).

I can probably scrounge up all the relevant information with respect to part numbers, wiring diagrams, and the like, if you want it...