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Things to do before you send your ABS2 brain to me for repair work.
Updated on March 29, 2017

I have checked many ABS2 ECU which was sent to me as error 7 but the cause of the error was
not ECU but hydro portion of the device.
so I would like to change the form of repair of ABS2 ECU.
Starting today,
The ABS2 ECU that can be accepted for repair is the one that indicates error 5,6 or 7 and
the error can be cleared as you reset it and the error recurs a few seconds after you turn ON the ignition.
Do not try to start the engine while you are doing above ECU check.

If your ECU meets above condition, please send the ECU portion ( enclosed in the cast aluminum case) only
Do not send hydro portion, I cannot repair it and sending it will just cost you a lot of money.

I have found that about 90% of defective ABS2 is caused by hydro portion of the unit, not electronic portion.
If you can reset the error but the error recurs soon after your bike moves off (run)
That means the defect is in hydro unit and No body can repair this unit.
Only workaround is to replace with a good working secondhand unit.

ABS2 units look same but they are not interchangeable among different bike models so
you need to find the secondhand which came from the same bike model.

BMW bike models that equipped with ABS2 are late K1100RS, late K1100LT, R850R, R1100RT,GS, R, RS, S, early (R1150GS, K1200RS, R1200C) and the appearance is as the following photo.

The front aluminum box is the ECU portion and is fixed to the hydro-unit seeing on rear ..
You need a special driver called Tri-wing and the size is #5 to loose the ECU securing screws. Two more screws are on the backside of hydro-unit.

When you separate the ECU portion from the hydro-unit be sure to pull the ECU straight toward you because as you see in the photo,
there is a connector at the bottom of each side, so pull the ECU gently toward you.




2017-3-29 update
All information below this line is old. Please read top 18 lines of this page to determine if your ECU can be repaired or not.

A. Questions about your ABS Brain error.


A1. Have you confirmed that you could read an error code at pin#2 of the diagnostic plug ?
If you have not checked and recorded it, please check it either with LED or an analogue tester because if you can read an error code it means that I can almost always repair it.
How to identify an error code is written on section 2 of the
home page . If you feel it is too difficult for you to read the code yourself, go to a dealer and ask them to read the code and write down what the error code they find is.

A2. Have you tried to reset the error using the process written below ?
Please refer to the description shown on this link page; http://www.largiader.com/abs/absfault.html


A3. Have you checked that your bike's battery is healthy and fully charged using a volt meter ?
It should measure over 12 volts if it is healthy with the ignition ON but the engine not running.
A weak Battery can cause error code 5, 6 or 7 so if your error is five to seven I recommend you first fully charge your battery then reset (erase) the ABS brain error memory and check if the error still exists when powered by the fully charged battery,
if the error has gone then you are lucky!

A4. Have you checked for any dirt or corrosion on the plug and socket of the 25 pin connectors on both the abs brain itself and the plug, in other words the male and female portion of both connectors?

Unlike ABS1 ECU, this type of ECU supply huge current to hydro clutches through only pin# 14 of the 25 pin connector, please check or clean especially this 14 pin .

If you found any, please clean them with DeoxIT http://store.caig.com/ contact cleaner and repeatedly insert and disconnect them 5 times give them another clean and then reconnect and try to reset the error, then see if the error has gone, if it has you are lucky!

If your answer is NO to any of above question then take action to check it and continue to Repair conditions section below.

If you are sure you have checked all of the things like corroded connections from the sensors and at the big plug into the brain, measured the correct gap at the sensors, done your reset process correctly as above but the fault comes back sometime after the reset, then your abs brain is probably defective.

B. Repair conditions and warranty.

Legal stuff
I will do the repair of the ABS with the greatest caution, but because of structural defects, the braking force can become zero in certain failure of ABS.
Therefore, when you ask me to repair the ABS, you must agree to give legal immunity to me.
End legal stuff

Please let me know if you have a problem with any of the following and we can discuss it.
1. It will take up to a maximum of three weeks from receipt of your brain to fix it and then mail it back to you.
2. Air mail will be used to return your ABS brain.
3. Payment must be made to my PayPal account as soon as I notify you of the completion of the repair work. I will not send your brain back until you have paid in full
4. Please inqure the repair cost along with your ABS error history by email..

5. The repaired brain carries a 180 days limited warranty. That is, if the brain reproduces an error during that period and provided you pay the round trip postage I will repair the brain at no extra charge. So far I am pleased to say nobody has had to return one to me for warranty repair.

6. If after I have gone through 5 days of testing and I cannot reproduce the error you described I will discuss the course of action with you and determine how to proceed. To avoid this delay it is vital for you to do the checking,reset,and error code readout in step A1 thru A4 above.

7. In general most parts I use in the repair are brand-new genuine parts.

8. Unlike ABS1 brain, ABS2 brain uses many custom made parts and they are not possible to obtain nowadays so there will be the case that I could find the defective but cannot repair it because of the parts availability.

C. For your Information the repair process I follow is:-

1. On receipt of your ABS brain I visually examine it for signs of mechanical or water damage.
2. I make a record of your ABS brain details and put ID tags onto the exterior and onto the circuit board so that they will not be mixed up with others. I then add a record to my repair database; this record can be used in future just like a medical record.
3. I then check your ABS brain's conditions using my monitoring tools to see how bad it is and I add the initial diagnosis to the record database.

4. I then hook-up my logic analyser and conduct a full diagnosis of exactly which electronic component/s is/are faulty.
This is the process that I believe no other repairer can parallel because a typical repair shop doesn't have this equipment nor do they have the circuit diagram that I have.
I have these and can do it because I have worked on R&D on embedded system very similar to the ABS brain.

5. I replace the bad component/s re-check the unit and add a record to the database.
6. I repeat step 4 and 5 until all errors are fixed.
7. I then again hook-up the monitoring tool and monitor the brain for at least 48 hours to see if another fault shows up. If any error condition occurs it will be fixed by again going step 4 thru 6 and documenting the results. This process is designed to make hidden errors appear so they can be repaired. I then check for proper error detection and function of error codes 1,2,3,4,5,6,7 and 8.

8. If all of the above steps are OK I pack the brain , notify you the work is finished, make a detailed receipt for the repair charge, include it in the package and add a record to the database.
9. The brain will be mailed out to you via air as soon as I receive payment.

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If you decided to have your ABS brain repaired send me an email to k100abs@gmail.com
In the email:-
Tell me your name , your country of residence, the detail of the bike model number (VIN) you have and a brief history of the ABS error and describe if any parts were replaced. In return, I will send you my postal details, address etc.

You can ride your bike while the brain is out of your bike for repair work. Your brake will work exactly the same as a bike but without ABS capability until you replace the ABS brain back in.

1. Please use courier with track and trace to enable you to track the parcel.

2. Do not enclose cash with the ABS brain please .
3. To save your cost use light weight material to pack round the unit so as to protect it from damage and use a small box so that the final packed weight is as small and light as possible.
4. While filling in the Customs form, please do not write the value of package as being over 10,000 Yen or 80 USD or 70 Euro or I will have to pay import duty at this end on arrival and if that happens then you will have to pay that duty.
5. It normally needs around 7 to 10 days to arrive here..
6. Please send me an email telling me when you send your ABS brain to me also please tell me the tracking number.

Thank you.
inserted by FC2 system