Legacy "ABS" system motor keeps running and drains

Discussion in 'Subaru Legacy' started by teddysmith1952, Dec 4, 2004.

  1. Hello all,
    My daughters 1995 Legacy has a problem that’s driving me nuts! Her
    battery keeps draining and I am hearing a "hum" and feeling a
    vibration coming from the ABS (whatever it is!) device located in the
    front left area under the hood as you look directly under the hood.
    This "device" often keeps running two hours or more after the car is
    shut off. This ABS device has an electical connection and several
    tubes and fitting running in and out of it. The battery is brand new.
    Has anyone heard of this problem and whether it’s an easy fix?
    Thanks in advance to anyone that can offer some help!
    Layton, Utah
    teddysmith1952, Dec 4, 2004
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  2. teddysmith1952

    mike Guest

    Your ABS is your Anti-lock Braking System
    the hum you feel is the valves opening & closing for emergency stop
    The problem you are experiencing is most likely the relay switch in your ABS
    is bad ( It gets stuck on the ON position & hence flattens your battery).
    The good news is that it is a cheap part to fix.
    From memory I cannot remember exactly where the relay switch is. Its either
    in the black fuse box in the engine bay or in the ABS unit under the black
    cover(and I'm pretty sure its here). If you remove this relay switch the ABS
    brakes will not work, the car's brake will still function but without this
    added safety feature.
    mike, Dec 4, 2004
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  3. Hello Mike,

    I really appreciate your troubleshooting expertise, and will take a
    look for that relay switch tomorrow morning.

    Thanks very much!
    teddysmith1952, Dec 5, 2004
  4. teddysmith1952


    Nov 6, 2020
    Likes Received:
    Metro Detroit
    You need to address that problem NOW! Issues with ABS can be serious. It is rare, but I have seen ABS issues cause NO brake power. We had a Ford and I had to disable the ABS because as I slowed down, when I got to just a few miles per hour, the ABS would NOT let the car stop! Not saying that will happen with your daughter's car, just that it is possible, so get it fixed!
    64vair, Nov 10, 2020
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