Results 1 to 8 of 8

Thread: 1994 K1100RS ABS Fault?

  1. #1

    1994 K1100RS ABS Fault?

    Im looking at a 1994 K1100 RS, with a ABS fault.

    The owner tells me that occasionally, the ABS lights will start to flash, after starting off, and riding several miles. Dealer told him that the ABS is good, but this is happening due to low battery voltage.

    So, is the dealer correct in diagnosing this prospective K1100 RS ABS ?

    My only experience with BMW ABS faults, are relegated to my R1100 RS. When my battery is beginning to go south, The ABS light simply stays lit, after starting.
    2000 R1100 RS
    2009 Jaguar XK

  2. #2
    If the ABS light flashes on startup, but then after riding a few miles the engine is restarted and the light stays off that is a low voltage fault. As far as I have been able to determine the low voltage fault is the only fault that will reset itself.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  3. #3
    Registered User GTRider's Avatar
    Join Date
    Apr 2006
    Location
    Nibley, UT USA
    Posts
    2,008
    Did you mean to post in the K-bike section? If so, a mod can move it for you so it gets more eyes on the problem.

    How the lights are flashing makes a difference, and can point to any possible problems. A good source for the light codes is here. Let us know which fault pattern is showing on your bike.
    Best,
    DeVern
    DGerber
    1983 R80ST 1984 R80 G/S-PD 2004 K1200GT w/Hannigan S/C 2010 K1300GT 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

  4. #4
    Fortis Fortuna Adiuvat Omega Man's Avatar
    Join Date
    Jan 2010
    Location
    Mansfield,MA
    Posts
    16,841
    Quote Originally Posted by GTRider View Post
    Did you mean to post in the K-bike section? If so, a mod can move it for you so it gets more eyes on the problem.
    I will move it a bit later
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

  5. #5
    Quote Originally Posted by Omega Man View Post
    I will move it a bit later
    OM
    Thanks, my bad. Meant to go in the K bike section.

    Thanks you OM
    2000 R1100 RS
    2009 Jaguar XK

  6. #6
    So this is what the owner is telling me. He starts the engine on his 1994 K1100 RS, and the abs lights will extinguish.

    It is only after traveling several miles, that the ABS lights begin to flash. He is not stopping and restarting the engine. The lights start to flash as the bike is progressing, with the engine continually running. So I am questioning whether this is caused by insufficient battery voltage, ie: a falling battery. Or, is this something else in the ABS system.

    The owner is able to reset the lights by doing a connection to the 3 pin plug under the seat. His dealer gives the ABS a clean bill of health, and says the issue is related to the battery power.

    Quote Originally Posted by PGlaves View Post
    If the ABS light flashes on startup, but then after riding a few miles the engine is restarted and the light stays off that is a low voltage fault. As far as I have been able to determine the low voltage fault is the only fault that will reset itself.
    2000 R1100 RS
    2009 Jaguar XK

  7. #7
    Registered User GTRider's Avatar
    Join Date
    Apr 2006
    Location
    Nibley, UT USA
    Posts
    2,008
    Quote Originally Posted by walshj1024 View Post
    So this is what the owner is telling me. He starts the engine on his 1994 K1100 RS, and the abs lights will extinguish.

    It is only after traveling several miles, that the ABS lights begin to flash. He is not stopping and restarting the engine. The lights start to flash as the bike is progressing, with the engine continually running. So I am questioning whether this is caused by insufficient battery voltage, ie: a falling battery. Or, is this something else in the ABS system.

    The owner is able to reset the lights by doing a connection to the 3 pin plug under the seat. His dealer gives the ABS a clean bill of health, and says the issue is related to the battery power.
    Quoting from Anton Largiader’s site that I linked to in my previous post:

    ABS2 was used on K1100 from 1994 onwards, R1100RS/RT/GS/R, and early R1100S, R1200C, R1150GS, and K12 models.* The K11 ABS2 uses the same two warning lights as ABS1: the ABS light and the bulb monitor light. On Oilheads and K12s, it has two distinct lights of its own. At key-on, the two lights will flash together and continue to do so until the self-test is complete (which doesn't happen until you start to ride away), at which time they extinguish. If the self-test fails, they will begin to flash alternately. The exact moment when the fault happens will help you know what caused it: if it happens before you start the engine it is an item that is tested at power-up. If it fails when you start the engine, it is almost certainly low battery voltage. And if it fails when you ride away, it's probably a modulator or a wheel speed sensor.

    Sometimes ABS2 will fault without showing a fault code that you can read without the diagnostic computer.”


    Based upon Anton’s comments it sounds like an issue not with battery, but with the modulator or wheel sensor. Testing the battery is simple: have it load tested at a local auto parts store, or replace the battery with a new or borrowed-but-known-good unit. With wheel sensors, the first think to check is the spacing from sensor ring and the straightness of the sensor ring. If those are good then a sensor could be suspect-but that should throw a fault code. Another possibility with a bike that vintage is a breakdown in the wiring leading to an open or shorted sensor circuit when the bike is warmed up and underway. As per Anton’s note, you may have a case of faulting without throwing a code that can only be read on the BMW diagnostic computer, which increases the difficulty of diagnosing.

    I’d settle the battery question first as it is so common an issue, then check sensor spacing and sensor ring. Let us know what you find!

    Best,
    DeVern
    Last edited by GTRider; 04-25-2021 at 08:20 PM.
    DGerber
    1983 R80ST 1984 R80 G/S-PD 2004 K1200GT w/Hannigan S/C 2010 K1300GT 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

  8. #8
    Fortis Fortuna Adiuvat Omega Man's Avatar
    Join Date
    Jan 2010
    Location
    Mansfield,MA
    Posts
    16,841
    Quote Originally Posted by walshj1024 View Post
    Thanks, my bad. Meant to go in the K bike section.

    Thanks you OM
    Quote Originally Posted by Omega Man View Post
    I will move it a bit later
    OM
    Good luck. Added a bit to your title- for clarity.

    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

Similar Threads

  1. '94, K1100RS, ABS1, Doesn't work, can't clear fault codes.
    By dieselyoda in forum Flying Brick K-bikes
    Replies: 3
    Last Post: 09-18-2014, 02:35 PM
  2. Reading Motronic fault codes on '93 K1100RS
    By 186709 in forum Flying Brick K-bikes
    Replies: 1
    Last Post: 08-22-2012, 01:24 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •