The module that I modified is from my wife's 89 260E.
Having a 126 part number, I would imagine that it was used in all vehicles of that vintage.
Looking at the 124 wiring diagrams, it looks like that module was used from 4/1987 to the end of production year 1990. Looks like my 95 E320 has a different module which I haven't bothered to modify cause I have a beater for winter and haven't got around to buying snow tires for the Benz. I will look into what needs to be done to modify it when I have some time.

Babymog, you might be able to get it to act manually like you want by removing that resistor entirely from the circuit (unsolder and lift one leg). I'll try it on a spare that I have and see what happens.