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Thread: Newbie to '03 K1200LT -ABS removal aftermath help

  1. #1
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    Newbie to '03 K1200LT -ABS removal aftermath help

    Hello! I'm a R1150GS owner that's just got into a unloved 03' K1200LT which came to me with the ABS already bypassed. The speedo and stop lights weren't working. Some reading and digging and I found the ABS wiring harness wasn't plugged in the ABS brain. I plugged it in and the speedo started working, but the brake lights are on solid, activating the front or rear brakes doesn't affect the brake light. It won't shut off. The ABS motor also buzzed when I first plugged the harness onto the ABS unit, but after I switched the key on and off a few times that motor buzzing stopped. So, I did a search here but that didn't show me any removal articles.

    Has anyone successfully removed the ABS and had the brake lights, speedo and cruise work afterward? I'd appreciate your ideas.

    Markus
    2002 R1150GS
    2002 R1100Rt
    2003 K1200LT

  2. #2
    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by RTandGS View Post
    Hello! I'm a R1150GS owner that's just got into a unloved 03' K1200LT which came to me with the ABS already bypassed. The speedo and stop lights weren't working. Some reading and digging and I found the ABS wiring harness wasn't plugged in the ABS brain. I plugged it in and the speedo started working, but the brake lights are on solid, activating the front or rear brakes doesn't affect the brake light. It won't shut off. The ABS motor also buzzed when I first plugged the harness onto the ABS unit, but after I switched the key on and off a few times that motor buzzing stopped. So, I did a search here but that didn't show me any removal articles.

    Has anyone successfully removed the ABS and had the brake lights, speedo and cruise work afterward? I'd appreciate your ideas.

    Markus
    2002 R1150GS
    2002 R1100Rt
    2003 K1200LT
    Markus,
    I really can't help you with this. I have a 2003 K1200RS (same bike) and with the integration of the power (aka "whizzy") brakes with the ABS I would think it would be much easier to take the system back to as designed than to remove both the power brakes and the ABS. Besides, with an 800lb bike like you have, the ABS could be a life saver. I suspect the "ABS motor" buzzing you heard is really the power brake pump as it runs any time the brakes are applied to provide pressure for the "power" effect. The ABS system only pulses the brakes as needed to avoid lockup.
    Greg Feeler
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    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

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    Registered User GTRider's Avatar
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    I had an RS1150 on the lift a while back that had brake light and turn signal issues, along with non-functioning ABS and boost pump. The problem was eventually traced to a defective aftermarket (Kisan) turn signal flasher that had been used to replace the very spendy BMW one ($325). That same BMW relay (61 31 7 679 867) is used on the K1200LT. Just sayin’ it might be worth a peek whether it’s the BMW relay or an aftermarket unit…

    Best,
    DeVern
    DGerber
    1983 R80ST — 1984 R80 G/S-PD — 2010 K1300GT — 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

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    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by GTRider View Post
    I had an RS1150 on the lift a while back that had brake light and turn signal issues, along with non-functioning ABS and boost pump. The problem was eventually traced to a defective aftermarket (Kisan) turn signal flasher that had been used to replace the very spendy BMW one ($325). That same BMW relay (61 31 7 679 867) is used on the K1200LT. Just sayin’ it might be worth a peek whether it’s the BMW relay or an aftermarket unit…

    Best,
    DeVern
    Must be one excellent relay!
    Greg Feeler
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    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

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    Registered User GTRider's Avatar
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    Quote Originally Posted by GREGFEELER View Post
    Must be one excellent relay!
    Look it up on the MaxBMW parts fiche; they include an internal schematic of that relay. Maybe to help justify the cost? Anyway, there’s a LOT packed into that relay!

    Best,
    DeVern
    DGerber
    1983 R80ST — 1984 R80 G/S-PD — 2010 K1300GT — 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

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    Update—
    Pulled the ABS unit off and took it apart. The brain was opened and plugged back into the harness and Speedo and brake lights work now.

    Tested the motors in the ABS and found one was initially sticky but ran fine after a few taps and the other ran fine. So I’m going to clean and rebuild both motors with new brushes. Then I’m going to reinstall with new brake lines and that should have it sorted out.
    Last edited by RTandGS; 09-12-2022 at 11:16 PM.

  7. #7
    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by RTandGS View Post
    Update—
    Pulled the ANS unit off and took it apart. The brain was opened and plugged back into the harness and Speedo and brake lights work not.

    Tested the motors in the ABS and found one was initially sticky but ran fine after a few taps and the other ran fine. So I’m going to clean and rebuild both motors with new brushes. Then I’m going to reinstall with new brake lines and that should have it sorted out.
    Sounds like you have a good plan to get this beauty back on the road!
    Greg Feeler
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    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

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    it's BMW community really

    So, when I got the K1200LT I went and bought some fitted bags from aguy who sold his and he introduced me to his nephew who has rebuilt every part of his 2 LT's . he's been the godfather of the repairs and the guy who told me all about how one can rehab the ABS units. So he is actually doing the rebuild on the unit. All because we own the same bikes. Thank god for the kind of folks who buy these bikes.

  9. #9
    Dances With Sheep GREGFEELER's Avatar
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    Quote Originally Posted by RTandGS View Post
    So, when I got the K1200LT I went and bought some fitted bags from aguy who sold his and he introduced me to his nephew who has rebuilt every part of his 2 LT's . he's been the godfather of the repairs and the guy who told me all about how one can rehab the ABS units. So he is actually doing the rebuild on the unit. All because we own the same bikes. Thank god for the kind of folks who buy these bikes.
    That's very true - it does take a village to support a BMW (all bikes, really). It would be great of your friend would be willing to share some of his knowledge, especially about working on ABS units since just about all BMW bikes from the early '90's on have one version or the other of ABS, and many like on your K1200LT are getting to the age and mileage where they may give trouble. "Rehabbing" an ABS unit like you are doing could make the difference between keeping a given bike in service or scrapping it.
    Greg Feeler
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    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

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