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I've had Audi's as daily drivers for 25 years now - nothing to fear. (Lots to work on!)
My recollection is that J30 is sortof like a "time delay relay" for the rear wiper. It outputs voltage to the rear wiper motor every so often so that it wipes the rear window, waits a while, and wipes again. For ~$4 replacement, you can't go wrong.
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