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Old 12-30-2000, 03:12 PM
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Hi All, need help,central locking stopped working.Have vacuum at hose from engine at fire wall but that's it.Where do I start? Thanks Wazza.
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Old 12-30-2000, 04:56 PM
Larry Delor's Avatar
What, Me Worry?
Join Date: Jun 1999
Location: Sarasota, Fl.
Posts: 3,026
I think that you may have an auxiliary vacuum pump in your trunk. If you do, it would be next to your spare tire on the right side, encased in a rubber mold. I have seen the electrical connector for one of these rot and not make contact anymore. This, however, was on a '84 W126...yours might not have this aux. pump.


[Edited by Larry Delor on 12-30-2000 at 08:53 PM]
"...rationality of thought imposes a limit on a person's concept of his relation to the cosmos." -Nash

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Old 12-30-2000, 05:33 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
All 126 chassis central locking systems use the single line system. This system has a pump that reverses giving either vacuum or pressure to lock elements.

All US cars had the pump in the trunk in the spare tire. The early Euro cars had it somewhere else, can't remember where. It was usually only the 1980 models but a few late 1980 models got titled 81 when they were brought in.

Find the pump, get a wiring diagram and see if the pump is getting its simple signal.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 12-30-2000, 06:00 PM
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Hi Larry,thanks for help,spot on, bad connection at vacuum pump.all fixed.
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Old 12-30-2000, 06:10 PM
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HI Steve,as you can see I fixed it,pump was in trunk.Thanks for help, Warren.
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