w124 central locking problems (estate)

[John Rodgers]

i wonder if any one can help.central locking on my 124 estate is playing up'useing key it will only lock drivers door but you can see it trying to lock other doors,and when locking from passengers side it will only lock pa ssengers door.Ican hear the pump working,any help would be great thamgs john

 

[DITTRICH]

The system operates by vacuum. If the only door locking is the one with the key in it then it is the key turning the lock which makes the "snib" go down I believe. The pump is obviously working so you have a leak somewhere in the system and it must be pretty big to stop the system working.

In my case, the system worked but slowly. Other times the pump would need to spend 40 seconds pumping away before the system would allow central locking to work. The culprit in my case was the diaphram inside the fuel filler cap locking mechanism and I had to replace the whole mechanism. The only way is to locate the leak.

 

[Stempies]

Yep, either a leak or the door mechanisms need greasing!!