Hello guys. I have a question on the operation of the central locking system. Can someone explain on how this system works and the operation of it? I have a 1982 300td wagon and dont know how it works. I have tried to look in the owners manual with no luck. I can have the car running and push the driver side lock down and all the locks go down. When i go to unlock the driver side it is the only one that unlocks. I dont have a clue how it works thanks guys.

Vacuum.

The driver's door has an actuator that routes vacuum to one side or the other of actuators in the doors and the fuel filler flap. The trunk/hatch lock acts a bit differently depending on key position, see your manual.

You probably have a leak in the "unlock" side of the system. Plenty of threads on it.

Here is a good thread on the W123 Vacuum Diagrams.

W123 Vacuum InterLock Diagram


Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works