Quote:
Originally Posted by Stevo
After you live with the MB locking system you get spoiled, I would fix it, its really convenient when you have it working  . Get your self a "mity Vac" for trouble shooting, its worth the effort. |
+2
Once you understand the basics of the system and have good schematics (in color on this site).... It is very simple to troubleshoot. There used to be a really good color schematic for the door locks here on this site. I think one of the members made it. It is VERY easy to follow....
Having a mighty vac makes it easy and you can test the various components.
IE: I found a bad "door lock actuator diaphragm" in my drivers rear door. I disassembled the actuator and put a "Slime Skab" over the hole on both sides. That was over a year and a half ago and the system still works flawlessly.
Around that time frame I also found some bad "vacuum elbows" in the car with the mighty vac. 2 on the ignition switch and a few under the hood.
Edit: Here is the link to the Color diagram if you get around to it.
W123 Vacuum InterLock Diagram