I have a 92 VW idi Jetta and pretty certain there is a 99 relay but never knew this programmable feature. I'd have to try it out and see if it works. I also have one or more spare 99 relay in my stash.

Did some googling and found this on tdiclub forum 99 Relay mod (programmable wiper) - TDIClub Forums with a pic of said relay showing p/n. Searched for the p/n and found it can be had for as little as $7 https://www.*******.com/products?keywords=1HM955531

Not sure if that is the same relay but worth a try.

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