Clicking sound when ignition turned on

Discussion in 'Electronics' started by clivem, Sep 5, 2012.

  1. clivem

    clivem New Member

    Messages:
    13
    Joined:
    Sep 25, 2011
    Car:
    SL55
    Hi there,

    I've got a clicking sounds coming from the rear right hand side of the car when I turn on the ignition. Lasts for about ten seconds.

    Garage says it's likely to be the power supply control unit, which determines which battery to charge.

    Problem is - it's 557 plus VAT to replace!!

    Anyone know if this part can be repaired or where I could source a used part? The breakers have not been much help so far :(

    Part number 230 540 1045
     
  2. DSM10000

    DSM10000 MB Club Veteran

    Messages:
    5,944
    Joined:
    Jul 12, 2011
    Location:
    Near Salisbury
    Car:
    E32O CDi Sport, MX5 1.8 Sport, RR 4.2 SC
    Rather than guessing why not go a specialist witn the MB Star computer and get a proper diagnosis?
     
  3. Pontoneer

    Pontoneer MB Club Veteran

    Messages:
    12,390
    Joined:
    Aug 19, 2002
    Location:
    Ayrshire
    Car:
    '93 190E 2.3LE W201 ; '93 300SL-24 R129
    It should be easy enough to track the source of the noise by getting an assistant to turn the ignition on and off while you listen in the boot ( or wherever it is coming from ) .

    If the unit contains relays ( hence the clicking sound ) which control battery charging , then there will be high-ish current involved , enough to heat up solder joints and cause them to go 'dry' .

    If you have any knowledge of working on circuit boards , this will be an easy fix ( five minutes with your soldering iron ) , otherwise find a mate who can solder competently .

    There may be another fault ( such as a failed diode or voltage regulator ) , but the above is a good place to start since it costs virtually nothing .

    If not a visible dry solder joint , then get a proper diagnostic test run .
     

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