On my 87 300D, my central locking system is mostly nonfunctional.
Oddly enough, it has come to life once or twice for several days in the half year I have owned this car. Once I locked my trunk and to my astonishment the system worked.
I have tested the vacuum pump iaw with info I got from other threads.. In fact, I have two now. I know they both work correctly. I have some understanding of how the sytem is supposed to work; i.e. the vaccum pump kicks on when it gets the right signal and kicks off when it gets the right signal.
The reason I would like to know this is because I have my driver side door panel off to fix the door lock which was vandalized and i am about to put it back on, and I am thinking of replacing the door actuator. After all, that in my mind would be the key link to the system. Can I jumper it to test the system?
This is (hopefully) the last time I take this door panel off.
I cant think of anywhere else to look. If I dont fix it this time, it will have to wait until the spring...