Maybe that will not work (not sure) as the GM is always checking and wants feedback from microswitches etc.
The problem of broken wires can be between A-pillar and door, but also inside the door, example here , click on the pics Kabelbruch Tuer http://bmwe32.pagaduan.org/
The easiest and fastest would be if you find someone with a diagnosis software for these old models. On the German forums for E34 they usually recommend to buy the diagnosis tool from https://doitauto.de/
They also have a FAQ and forum, maybe you ask there what you need https://forum.doitauto.de/

Or find someone near your home with such a software, as I recommended before.