I have a 93 W201 with a wiring problem. I think I have to rewire the central locking system, as it is blowing the fuse with the pump connectors disconnected. This means that there is a short to ground somewhere in the circuit. However, I am not sure how the system power works and the manual is not too helpful.

Does anyone know the vacuum pump pin functions? There is a rectangular connector with 2 heavier gauge wires going to it....red and brown. Are these the power/ground to run the pump?

The round connector has 3 pins, 2 of them green and one brown (if I remember correctly). What are these?

Any help appreciated.
cheers

Click on the "DIY Articles" tab at the top of this page. One of the articles outlines adding keyless entry to... I think a 124. (It should be essentially the same for your 201.)

The article will help you decifer what's what on the system.

Good luck... post back with your results.

Jeff Pierce

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Jeff Pierce

Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
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'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
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'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F

there are 3 other things on the fuse that could blow it.lights in the doors if broken could be grounding etc.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Thanks. I have eliminated the lights as the problem and don't have power seats. Besides, I looked at the wiring conduit under the passenger's seat and the wires for this system are melted together in a nice big clump. Rather than tear out the centre console etc to find/replace the whole harness, I think it would be simpler to disconnect at the power supply and rewire the system.