C124 300ce Central locking question.

Discussion in 'General Discussion' started by whirsk, May 3, 2017.

  1. whirsk

    whirsk Active Member

    Messages:
    75
    Joined:
    Nov 30, 2014
    Location:
    Galway Ireland
    Car:
    1990 300ce
    Hi Folks
    I am currently having an issue with central locking on coupe.
    The passenger door will open and activate central locking (drivers,fuel,boot).
    Unfortunately the drivers door will not activate central locking.
    Is this a completely mechanical/vacuum or is there an electronc controller?
    Perhaps there is a damaged switch/contact in drivers door?
    If anyone has had any experience with these systems,advice greatly appreciated.
    Thanks in advance.

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  2. CabrioDave

    CabrioDave Hardcore MB Enthusiast

    Messages:
    243
    Joined:
    Dec 18, 2016
    Location:
    West Midlands, UK
    Car:
    A124 E220 Cabriolet
    An electrical system tells the electronic controller that a doorlock has been opened/closed (or the remote system activated). That controller then gets the electrical pump to "suck" or "blow", as it were, to move all the lock actuators.

    If the passenger door does it OK, it looks like the controller and pump are fine. For some (electrical?) reason, the message is not reaching the controller from the driver's door lock.

    Does the boot lock activate things?
     
  3. OP
    OP
    whirsk

    whirsk Active Member

    Messages:
    75
    Joined:
    Nov 30, 2014
    Location:
    Galway Ireland
    Car:
    1990 300ce
    Thanks CabrioDave
    Not sure about the boot,will check it out.

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  4. Pontoneer

    Pontoneer MB Club Veteran

    Messages:
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    Joined:
    Aug 19, 2002
    Location:
    Ayrshire
    Car:
    '93 190E 2.3LE W201 ; '93 300SL-24 R129
    There's a microswitch in each lock so that when you turn the key one way or the other it makes the pump run accordingly to operate the actuators .
     
  5. Dec

    Dec Hardcore MB Enthusiast

    Messages:
    4,475
    Joined:
    Jul 28, 2004
    Car:
    C180,A.
    Can you still lock or unlock the driver’s door with the turn of the key, without the assistance of the central locking?

    Dec
     
  6. OP
    OP
    whirsk

    whirsk Active Member

    Messages:
    75
    Joined:
    Nov 30, 2014
    Location:
    Galway Ireland
    Car:
    1990 300ce
    Hi Folks
    The story so far appears that the drivers door and boot will open manually,but neither are activating the central locking.
    I can hear the microswitches clicking in both locks.
    Where is the locking control unit located perhaps i have damaged wiring?
    Thanks in advance

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  7. Dec

    Dec Hardcore MB Enthusiast

    Messages:
    4,475
    Joined:
    Jul 28, 2004
    Car:
    C180,A.
    Under back seat I think. Sit inside the car and lock the passenger door and you will hear the pump run for about 2 seconds.

    See… PeachPartsWiki: Keyless Entry Install

    How many Yellow tubes are there on your vacuum pump?

    Dec
     
  8. CabrioDave

    CabrioDave Hardcore MB Enthusiast

    Messages:
    243
    Joined:
    Dec 18, 2016
    Location:
    West Midlands, UK
    Car:
    A124 E220 Cabriolet
    There are quite a few older threads about this. (I know, because they recently helped me sort out my central locking.)
    The controller is in different places for different models. My cabriolet: under the rear seat, at driver's side of the car, together with the vacuum pump. Can't remember whether the coupé is the same.
     
  9. OP
    OP
    whirsk

    whirsk Active Member

    Messages:
    75
    Joined:
    Nov 30, 2014
    Location:
    Galway Ireland
    Car:
    1990 300ce
    Thanks Guys
    Will check it out and report back.
    Cheers for info,safey driving.

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