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Old 10-01-2008, 07:35 PM
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Join Date: Jul 2007
Location: Oregon, Illinois (about 100 miles due west of Chicago)
Posts: 351
Central locking pump replacement

I have an 83 380 sel that I'm slowly bringing back to life. I'm currently working on the central locking system, and wanted to be sure I had a working pump before doing anything else. In short applying voltage to the connector on the pump produced lots of sparks but no action. I disassembled the pump and found a well cooked motor. (see photo)

I had purchased another pump on Ebay but it turned out to be the wrong one. Anyway I disassembled it and found the motor was identical and looked like new so I removed it and installed it in my original pump. However, when I bench tested it, it would produce pressure but not vacuum. (see photo)

Is there most likely something wrong with the circuit board, or is my testing faulty? If it's that the circuit board is at fault is there anyway to make the pump I bought on Ebay work on my system? (see photo)

Any guidance would be greatly appreciated. Thanks.

2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire
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Old 10-11-2008, 01:33 AM
cdplayer's Avatar
Just my Jeep and my S500
Join Date: Aug 2006
Location: Sacramento, Calif.
Posts: 581
Pump types

This will not help any. Just a comment. Canvassing the yards for parts,
I see the pump you origonally had in 83 to 84 model S class. The one you got from Ebay I see in 1985 and later models. They also are in the W201 chassis as well.
Haven't taken the time to trace the additional electrical connections on the newer style pump. I got a couple, but have not learned how to test yet.

For now I focus on the earlier model. I do know on the older model, a pressure valve shuts the pump down when it's pressure limit is reached.


Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!

Last edited by cdplayer; 10-11-2008 at 01:37 AM. Reason: spelling
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