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Thread: E34 ABS light diagnosis

  1. #1
    Join Date
    Oct 2004
    Posts
    9

    Default E34 ABS light diagnosis

    The ABS light is on. Doesn't go out.

    It used to be fine, then one day decided to stay on.

    I replaced the front struts shortly before the ABS light problem, though it was all OK after the job, just started a couple of weeks after.

    I've checked the wiring/connectors to the wheel sensors and they all seem to be OK, as was the wiring to the ABS unit by the fuse box. I cleaned the exteriors of the wheel sensors (did not remove them) as they were dusty.

    I'm guessing a faulty wheel sensor? How can I tell which one it is or if it is something else??

    Thanks in advance for any replies/advice/solutions/ideas!!

    Brakes haven't been worked on since a fluid change at BMW 10 months ago.

  2. #2
    Join Date
    Dec 2003
    Location
    1/2 Way tween Chicago & Milwaukee
    Posts
    844

    Default

    Similar thing happened to me, I'm also assuming it's one of the wheel sensors. Mine stayed on after hitting a big pot hole. You may just want to have a Bimmer shop reset the ABS system. It's supposed to just take a minute and they may do it free. I tried to do mine using a Bav Auto reset tool to no avail. I have just left mine at fault, cause I installed a MOMO wheel anyway (no more airbag)! The MOMO wheel gave me much more leg room as I am 6'4" and needed that extra room to do my "clutchwork".

    A Bimmer Nut for sure: '04 530im (current daily driver), '97 m3, '98 323is, '99 Z3, '01 740iL, '06 330cicm zhp, '02 R1150R, '69 r60, Owner/Operator of www.Bimmer.info and www.BimmerNut.com
    And I still maintain: '90 535im (sold to daughters best friend, one of my favorite bimmers), '92 525im (daughters other best friend now drives this one).

  3. #3

    Default

    Try removing the the sensors and cleaning the working side. Most likely you will find that they are covered with iron filings.

    Warren Brown
    91 318is
    95 525iT

  4. #4
    Join Date
    Oct 2004
    Posts
    9

    Default

    Quote Originally Posted by WarrenBrown
    Try removing the the sensors and cleaning the working side. Most likely you will find that they are covered with iron filings.

    Warren Brown
    91 318is
    95 525iT
    Thanks guys.

    I'll try removing them and cleaning them out. Can I just unscrew the socket cap/Allen bolt without removing anything else to pull them?

    Thanks again!

  5. #5
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,774

    Default yes,

    you will have to be careful wiggling them out cause there is usually a stiff grease on them, at least mine was real tight. Clean them up, if there was a ton of metal on them the fault is because the filings grounded to the backing plate (usually).
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  6. #6
    Join Date
    Apr 2004
    Location
    Raleigh, North Carolina
    Posts
    279

    Default

    Sheesh, my light is on too. Happened after I lowered my friggin tire pressure. What luck.
    Ex-Calypso Red 540i owner

  7. #7
    Join Date
    Oct 2004
    Posts
    9

    Default

    Is there an ABS system fuse I could check too?

    If so where is it, since it doesn't seem to be listed....

    Thanks everyone!

  8. #8

    Default

    Try fuse 1 and 17.

    Warren
    91 318is
    95 525iT

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