If it is the "auto rear wiper" operation when car is running, the front wipers are "on" and reverse gear is engaged, then I think that you could only ever achieve this by changing the coding in the right controller using VCDS or similar.
I've never found this to be a
problem, if the screen(s) is/are frozen, then you would make sure that the front wiper is "off" before starting the engine, so the rear wiper would never "auto operate" - though maybe you have another reason to stop this "convenient" feature happening.
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