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W170 - 2003 SLK 230 - spurrious hazards flashing

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by GrahamDo, Aug 1, 2020.

  1. GrahamDo

    GrahamDo New Member

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    Joined:
    Jun 1, 2004
    Location:
    Wiltshire, UK
    Your Mercedes:
    W170 and W166
    Hi everyone - started in the last week (following a few days of good old British rain, and then a very hot day or two).....I park up my W170 and lock it with the remote central locking and then after anywhere between 10 and 30 minutes, the hazards then start flashing rapidly. There's no horn alarm at the same time, so I'm assuming it's a short circuit somewhere but struggling to know where to start with this one. Other than this, and roof that is sometimes temperamental, she's been a reliable old girl.....anyone had anything similar?

    Thx
     
  2. Blobcat

    Blobcat Moderator

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    Location:
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    Your Mercedes:
    R171 SLK280 3.0, Land Rover 110 County SW
    Have a look below the carpets in the boot for water ingress
     
  3. OP
    GrahamDo

    GrahamDo New Member

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    Your Mercedes:
    W170 and W166
    Ok, thx Blobcat....will try that
     
  4. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    If it has a factory fit mb main dealer alarm, this would be the most likely culprit. Often located under the dash
     
    grahamcol and GrahamDo like this.
  5. OP
    GrahamDo

    GrahamDo New Member

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    Your Mercedes:
    W170 and W166
    Thx Alexanderfoti
     
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  6. grahamcol

    grahamcol Senior Member

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    Location:
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    Your Mercedes:
    2001 SLK230, 2007 CLK220 CDI
    Yes, the factory alarm sirens tend to play up as the internal batteries age. Some just disconnect the siren but there might be insurance implications.
     

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