Relay ?

Discussion in 'Electronics' started by ecossebev, Nov 18, 2012.

  1. ecossebev

    ecossebev Active Member

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    219
    Joined:
    Dec 9, 2008
    Location:
    Edinburgh
    Car:
    Mercedes Benz 230 TE
    The puddle light on my drivers door, at one point during the previous owners life, broke a clip and was held in with a piece of Blu-Tac, which then gave up the ghost causing the light to pop out and smash while he closed the drivers door. It was then popped inside the door and forgotten about.......until today when l decided it was a good idea to mess about with it.
    When messing about with it there was a noise similar to the popping noise that comes from bursting bubble wrap from behind the dashboard.
    The resulting 'pop' now means the central locking doesn't work, nor does the alarm, the rear interior light, the drivers door courtesy light, or the function which allows the electric windows to be operated without the ignition key in the barrel.
    I've checked the fuses and seen nothing out of place. Given the limited knowledge l have of auto electrics, can anyone point me in the right direction and shed any light on the problem (and the inside of my car).
    I still have the '91 W124 230TE.

    TIA Sean.
     
  2. Robster_1981

    Robster_1981 Active Member

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    Sep 3, 2012
    Car:
    W210 E320 CDI
    Have you checked the fuse properly? I'm not sure exactly which one it is, but you need to pull it out and you should be able to see a small shoe horn shaped piece of wire. If this is missing or broken, then the fuse is gone. The popping noise is the noise of the wire burning away from excess current.

    If you really don't know much about electrics, then wrap the ends of the wires for the light in insulation tape so the bare ends can't touch each other, then replace the fuse and you should be sorted :)
     
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  3. OP
    OP
    ecossebev

    ecossebev Active Member

    Messages:
    219
    Joined:
    Dec 9, 2008
    Location:
    Edinburgh
    Car:
    Mercedes Benz 230 TE
    It's not a blade fuse, it's one of the old style continental fuses and it looks fine. I think everything l mentioned not working above is covered by more than one fuse and everything was working fine before this, hence the reason l thought a relay was at fault.
     
  4. Dieselman

    Dieselman Banned

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    I suspect the light control unit has gone for a burton.

    There won't be a relay as the lights dim, it will be the output transistor blown up due to being dead short.
     
  5. OP
    OP
    ecossebev

    ecossebev Active Member

    Messages:
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    Joined:
    Dec 9, 2008
    Location:
    Edinburgh
    Car:
    Mercedes Benz 230 TE
    How would this affect the central locking, alarm and the electric windows not working with the ignition switched off ? The rear interior lights work, just not when the doors are open. They were all working prior to this.
     
  6. Dieselman

    Dieselman Banned

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    Car:
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    It's all the same module, it controls the lights and windows when the door switches operate.
     
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