Central Locking Problem ??!!

[Jm123]

Hello.....

I own a 1989 300se auto.

My central locking will only lock the drivers door and the boot instead of everything??? It's an intermittent thing as well as it'll do all of the doors on the odd occasion.

Any ideas??

Thanks

Jim

 

[television]

More than likely a pneumatic problem air leak some where

Malcolm

 

[philharve]

Will someone tell me why MB opted for pneumatic locking as opposed to electronic?

REGARDS Phil

 

[television]

Its because it all locks with a nice refined dull expensive sound, and when it goes wrong, ie when the boot will not open we can feed their engineers for a week or two. electric locking is very noisy, clonk.

Malcolm

 

[Stevie A]

I think the vacuum central locking design on Mercs is one of the design flaws of Mercs. Electronic units on each door are better and easier to fix. They should change to electronic.

By the way can someone please explain how the Merc system works - ie when the car is locking is it the central pump that pulls the individual strikers / lock down? Or does the vacuum cause an electronic switch to lock at each door?

I ask as my two back doors open all the time but will not close all the time with the central locking.

 

[philharve]

By the way can someone please explain how the Merc system works - ie when the car is locking is it the central pump that pulls the individual strikers / lock down? Or does the vacuum cause an electronic switch to lock at each door?

Hi All

This is a question that I am interested in. The 'power' to operate all/most locks is pneumatic but surely it's a low power electronic actuator/transducer that controls the vacuum to each lock mechanism?

I had electronic central locking in my last car and it never gave any trouble in 17 years. This makes the question as to why MB adopted pneumatic locking rather difficult to answer. It has been suggested to me that maybe pneumatic locking is simply quieter and more refined (read 'classy') than electronic locking which is relatively noisey, i.e. clonky (read 'brash').

I was expecting a rather different answer, e.g. it's safer.

REGARDS Phil