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Thread: Hyperactive ABS

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  1. #1
    Join Date
    Nov 2014
    Location
    Sussex
    Posts
    17

    Hyperactive ABS

    My ABS is triggering for no reason. It doesn't seem to matter if I am braking hard or soft, on smooth or rough ground. Sometimes I can hear the pump activating whilst driving along a perfectly flat dry road. DAS is giving a fault code C1159 'Implausible signal from stop lamp switch' which didn't come as a great surprise because I know the switches cause problems with ABS. But I have replaced the switch and checked all the wiring I can see but the problem persists and the fault code is still there. I'm running our of ideas. Can anyone suggest what to do next? Has anyone experienced a similar problem.

    It's a 2007 Roadster Coupe by the way. I posted this here rather than the Roadster page because I believe the ABS on all Smarts from this year is near enough the same so I wanted to ask for advice from ForTwo/ForFour etc. owners too.

  2. #2
    Join Date
    Mar 2012
    Location
    Burnley
    Posts
    1,371
    Reluctor ring buggered. Buy one off ebay, do not go to Mercedes, they will sell you a drive shaft for loads of £ but the rings on ebay are only a few quid. There are threads about it if you search the forum.

    That's the normal reason for ABS doing that but it may also be your brake light switch though active ABS is not common for that fault though not unheard of.

  3. #3
    Join Date
    Oct 2009
    Location
    Bury Lancs
    Posts
    141
    What Mjolinor says. My ABS used to 'chirp' as you came to a stop due to rusted through reluctors. These are the reluctor rings I bought.
    https://www.ebay.co.uk/itm/2X-FOR-SM...gAAOSwdsFUQubb

  4. #4
    Join Date
    Apr 2009
    Location
    Ecosse
    Posts
    3,595
    Before you go replacing reluctor rings, check tyre pressures and sizes. Have you fitted new tyres recently?

  5. #5
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,294
    J&R sell ABS rings for less than £2.50 each with shipping included.
    Drives a Smart Cdi - 65 to 85 MPG

  6. #6
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,294
    Photobucket has reluctantly reinstated broken image links although only for a limited time.
    http://www.smartz.co.uk/showthread.p...and-proper-way

    Tool is still available for hire.
    Drives a Smart Cdi - 65 to 85 MPG

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