Convenience relay is located under the rear bench seat on drivers side. Sounds like you could have a faulty window switch. Your model year does have the one touch auto down feature, but from your description, it is acting strange. If I remember correctly, you can’t just remove the module/relay from under the seat or you will lose power to the windows. I suggest pulling the module, inspect it for moisture, make sure it is getting a good connection, plug it back in and see what happens. If still not working, these modules are easy to find at most pull yards and were plentiful on fleabay and reasonably priced. I believe any convenience relay from a 1992-95 will work as well as 94-97 W202, but not positive. Actually, the cab module is different, but you won’t find one of those floating around, if you do people are asking crazy money for them.

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2023 Ram 1500
1987 300TD
2002 ML 320
2001 Chevy Suburban
2006 S430 (gone and trying to forget)
1985 300TD (returned to father)
2007 GL320 CDI (sold to brother)
1995 E320 (sold)
1991 500SL (parted out)
1995 E300D (RIP)
1991 300D (RIP)
1995 E320 Wagon (sold)
1992 300TE (sold)
1988 300CE (sold)
1994 E320 (sold)
1995 E300D (sold)
1978 300D (RIP)
1987 260E (sold)
1992 400E (parted out)
1989 300E (parted out)