This russian site has wiring diagrams from Mitchell manual:
http://www.autolib.diakom.ru:8001/cgi-bin/CARS2/carsmain.pl?dir=/CARS2/main/Mercedes-Benz/shematic&description=%CF%F0%E8%ED%F6%E8%EF%E8%E0%EB%FC%ED%FB%E5%20%F1%F5%E5%EC%FB.

Here is a direct link to 1993 190E ext. lights schematic:
http://www.autolib.diakom.ru:8001/CAR/Mercedes-Benz/1993/190E/SYSTEM%20WIRING%20DIAGRAMS/4417.pdf


Mike