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  1. #1
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    Member No: 11994 abdoul is an unknown quantity at this point abdoul's Avatar
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    Help! ABS/ASC/Traction Control Mysterious problem

    I have a 1999 740i with teh following diagnosed problems:

    -- three ABS sensors were bad

    I replaced all four sensors but am still having these problems:

    -- ABS/BRAKE and AST symbol are lit permanently
    -- Speedometer no longer works

    EXCEPT

    (1) when it's really cold in the morning (2) for about 10 miles or so then it dies.
    -- occasional loss of power steering..

    I had the system reset by my mechanic many many times.. but to no avail. I have 4 new abs sensors installed (properly.. cleaning before installing and what not...)

    Where do I go from here


  2. #2
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    Re: Help! ABS/ASC/Traction Control Mysterious problem

    The speedometer issue would seem to point to a bad sensor, but it is extremely unlikely that multiple sensors (especially 3 or 4) are bad. In my case, the computer said a sensor was bad, but actually the control unit itself was defective. There is a repair kit available (about $800) if this is the case for you.

  3. #3
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    Re: Help! ABS/ASC/Traction Control Mysterious problem

    It is in fact the ABS/ASC/DSC control computer which is on the front of the ABS pump. Delt first hand with that and that is exactlly what it did.

  4. #4
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    Thanks.. guys.. I was in .... denial! :(. $800?!


  5. #5
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    why would it work when temp < 35 degrees

    That's mysterious! Whenever it's freezing outside... both speedometer and traction control works... ?!?!?

  6. #6
    BMW MAN
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    I PAID $ 75.00 FOR REPAIR KIT ON EBAY


  7. #7
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    Re: why would it work when temp < 35 degrees

    I wish I had a good answer for that but I do not all I know is that was the problem with the car I had here and yes I pulled my hair out before I figured it out.

  8. #8
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    Re: why would it work when temp < 35 degrees

    Looks like I am buying a DSC/ASC controller.... Cheers

  9. #9
    Morty K.
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    Circle BMW was $499 for the part.

    It is a very simple job to r&r the part. Then you must have the car re-programed.
    Morty K.

  10. #10
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    Re: Circle BMW was $499 for the part.

    $499?? that's a lot cheaper than locally here... I'll check out Circle BMW.. :)

  11. #11
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    I've sent my module out to Module Master - $300 +

    shipping. Got it repaired and sent back to me. No reprogramming needed as I got my original module back. 5 year warranty. I couldn't be happier with the deal. Installation and removal was very simple.
    Good luck!Gene
    Jet Black '99 740i de-chromed

  12. #12
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    Re: Help! ABS/ASC/Traction Control Mysterious problem

    It works when it's cold most likely because of a "cold solder joint" in control unit. Before I shelled out any money I would open up unit and investigate. Your looking for small rings/cracks in solder around the heavier components. Output transistors,relays etc..

  13. #13
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    Re: I've sent my module out to Module Master - $300 +

    Hi Gene,

    Can you please provide me the information of the workshop (contact, number, name address etc) who can rebuild he ABS module with 5 years warranty?

    Thanks,

    CB
    [email protected]

  14. #14
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    Re: I've sent my module out to Module Master - $300 +

    Instead or before rebuilding module check all four wires on wheels...
    BTW, visual check is not enough... if replace one of the wires, must replace the others, too. CAVEAT: wires may appeared to be all right but the shield is weak and crack...




    "Keep Right, Pass Left. It's the Law."



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