Vacuum locks-83 300SD,i am at wits end please help!!!!!

[RG5384]

I am completely clueless as to how this system works. My problem originated that the system just stopped working alltogether all at once, no warning etc. My first suspect was the pump, but i pulled it out of the car, checked it with an outside 12volt source and it ran. My next suspect was the driver's door actuator. That didn't seem to be the problem eaither. This is where the real confusion begins. IF i leave all of my vacuum connections attached to the pump, it will continualy try to open allready open door locks untill it times out, UNLESS, i push down one of the locks WHILE it is trying to open them, it will then switch to locking everything, and after everything is locked, it will then UNLOCK everything. The cycle goes on and on. HOwever, if i disconnect any one part of the system and plug it with a golf tee, it will unlock, lock, unlock, lock, unlock lock(you get the point) untill i disconnect the actuator in the drivers door. Jumping the actuator alltogether provides the same results. I have absotely NO CLUE how this thing is working, all i know is that it ISN"T working. after this i think i'll take electic actuators any day of the week! please help me figure this out, i am about to say screw it to central locking! thanks in advance
Ryan