Question about 1994 Mercedes-Benz S-Class

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I have a 1995 Mercedes Benz s320 and my doors wont lock

My key remote does not lock my doors and neither does the switch inside the car. I have to manually push down each lock to lock the doors and turn the key in the driver door to lock that one. Please help!!!

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  • lightsout987 Mar 10, 2009

    i have the same year and model car
    and the same problem haha
    i do not know what is wrong. im guessing something with the vacuum mecanism with these cars.
    let me know if you find a solution

  • ShoppingGuy Apr 06, 2009

    Me too. I checked 12 supply to the vacuum pump and there is none. I checked the fuse that supplies 12V (fuse box in trunk) and it is OK, Sothe supply between my fuse and the vacuum pump has been cut. The same supply line goes to the cig lighter and the glovebox light (and neither of these are working), How do I trace the wires from the fuse to the vaccum pump, or lighter or glove bix light without pulling the car to pieces.



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There is a central door locking pump under the back seat, the motor has gone in it, cheap way to repair is to strip it down and put a motor in it from a tyre compreser from argos for under £10 very easy to fit just two wires

Posted on Aug 05, 2009

  • Benz500 May 30, 2011

    How do I get in touch with this company to order the motor?


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Pump under the rear seat. if it doesnt come on, then try to tap it LIGHTLY with a hammer or wrench. sometimes it will come back. second if the pump does come on, then its a leak, start at the pump, just always make sure you know which hose goes where. sometimes it might come loose..

Posted on Oct 18, 2009


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SOURCE: 1995 Mercedes Benz S320

sounds like you have a wiring problem in the main lock switch in the driver side door or wires that run from there to the other doors. one of the wires in this system does not have a good enough connection to allow enough current to operate the locks. put another way, the wire itself is introducing unwanted resistance which reduces the current flow. the resistance could be a result of a poor connection at a junction or a section of wire which has corrosion or some other problem which diminishes flow. to find exactly where the problem lies will involve removing door inner panels and making voltage drop tests across connections. works something like this: i started out with 12v dc, i know this component should use 3.4 v (or whatever it is) but now i only have 4 v coming to this next component. so the wire is using some of the voltage. some drop in the wire is normal, but not very much. that is how i would troubleshoot it. you can just check the connections to power and ground, just look at things and make sure you don't see corrosion, wiggle connections and see if it makes something different happen, but you will still have to take the doors apart to do it. hope that helps

Posted on Jun 04, 2009

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