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post #1 of 13 Old Jul 13th, 2008, 7:54 pm Thread Starter
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Alternating ABS Lights

I have read about this but have a question: First I let the battery get down to 8.7 vdc. The first indication is that the GPS would not come on, but the bike started fine. Rode for about 20 minutes at 50-60 mph with no indication of problem. ABS lights were off.

The battery charged enough after 25 minutes to allow the GPS to come on. Checked the battery voltage and it was 13.2 vdc.

Then all of a sudden, the ABS lights came on in an alternating manner. Rode 45 minutes more. Shut down for lunch and 25 minutes later turned in ignitiin and light were still alternating.

Is this something bad? Do I need to change the battery, disconnect and reconnect or can the BMW dealer just reset the ABS circuit?

Thanks in advance for any help.

OKU

O. K. Upchurch III
Irvine, California

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post #2 of 13 Old Jul 13th, 2008, 8:15 pm
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Re: Alternating ABS Lights

If your bike has the integral brakes the cause is most likely one chamber of dual chambered rear reservoir is low on fluid. Add a small amount (usually the rear most of the two chambers) and it should go away. If you have the ABS II system (99-00) there are different causes for the alternating lights.

John
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post #3 of 13 Old Jul 13th, 2008, 8:38 pm Thread Starter
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Re: Alternating ABS Lights

Sorry ..........I forgot to say that my bike is a 2000. Its been great and never had a problem... I am away from home and have no way to keep charge up and I let battery go too low.

O. K. Upchurch III
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post #4 of 13 Old Jul 13th, 2008, 10:43 pm
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Re: Alternating ABS Lights

A couple months ago one of our more ingenious members finally figured out a way to reset the ABS flashing lights without taking it to the dealer. I copied the instructions from the post and have pasted them below for your use.

For 99/2000 model LTs.

It is not for models with integral ABS.

It has been suggested that the only way to clear ABS2 faults is by placing it on the diagnostic computer at a dealers shop. It can be done at home relatively simply.

You can clear the memory of faults and returns the ABS warning lights to normal on startup. If however you have failed to cure the cause of the fault, e.g. bad wheel sensor, the warning lights will return to their warning state once the bike has gone through it's self test process.

Firstly you can do some investigation of your own fault codes. Under the front seat and clipped to the frame there is a diagnostic connector. It is cylindrical in shape and has a removable push-and-turn gray cap.

Remove the cap and locate the pin 2, connected to a brown/blue wire. Connect an analogue meter between pin 2 and earth. Turn on the ignition. The meter will initially settle at around 10V. It's what happens next that is of interest. The needle will fall to a number of lower voltages in a series of pulses. Count the number of needle drops. This number is your fault code.

The following codes have appeared on other forums.

1.Front pressure modulator.
2. Rear pressure modulator.
3. Front wheel speed sensor.
4. Rear wheel speed sensor.
5. Battery voltage too low.
6. ABS relay.
7. ABS control unit.
8. Sensor gap front or rear or other outside influence.
9. Unknown.
16. Failed plunger test.

Ok. This may help you cure the actual fault, which is causing the alternating (wigwag) warning lights.

TO CARRY OUT A RESET
You need to get to pin 21 on the ABS controller. The connector is plugged into the ABS unit, which can be seen next to the battery holder towards the left hand side under the seat. Remove the battery to create some space.

RELEASE THE CONNECTOR
As you look down from above you can see a protruding rectangular steel clip at the bottom of the connector. You need to push this down while you pry out the connector from the bottom. However, the connector continues to be held in at the top of the unit. The connector itself has a plastic lip, which hooks under the top of the ABS unit. You will see a small screw in the top of the connector. Do not remove this, it will not help it has nothing to do with release. Use half a junior hacksaw blade to saw the piece of plastic from the connector. This allowed it to come free.
OR
Remove the ABS controller wiring connector more easily by removing the positive cable post junction located behind ABS connector. This allowed enough room to release the top lip. Bosch fuel injector connectors off a 2002 Kia Sportage just happened to have same wiring connectors as the BMW ADS controller (small world!!) just run new wire to #21 terminal just like factory and leave for future reset.

OR
Dismantle the connector to reveal the wire locations. Roll back the rubber protector tube where the wires enter the connector. This reveals two screws. There is another screw at the top of the connector. Remove all three screws and then pull the connector block from itís housing so you can see where the wires enter the terminal holes.

The inner connector has its terminals numbered along the sides. Terminal 21 is vacant. I stripped a thin wire and threaded it through the hole and then bent a small amount over to hold it in place being careful not to interfere with other terminals. I then carefully replaced the connector onto the ABS unit and replaced the battery.

RESET
Ground pin 2 of the diagnostic connector and kept it grounded. Switched on the ignition. Both ABS lights will be flashing alternately. Ground the wire from pin 21 and make a count of the number of seconds for the fault you have. As soon as you ground this wire one ABS light will stay on and one will turn off. At the end of the count remove the pin 21 wire from ground. Both ABS lights will now stay on together. Switch off the ignition and removed the diagnostic ground wire. Switch the ignition back on, both ABS lights should be flashing simultaneously.

Leave the pin 21 wire in place so it can be reset in the future at will.

Chris

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post #5 of 13 Old Jul 14th, 2008, 8:14 am
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Re: Alternating ABS Lights

All though I have not looked at it the GS-911 has come out with a Beta version of SW that handles the ABS II now. Not sure if it can the reset but it should.

John
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post #6 of 13 Old Jul 14th, 2008, 8:29 am
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Re: Alternating ABS Lights

I had this issue on my 2000 as well. I found I had a weak battery. I would start the bike and leave everything off for a mile or so then turn it off and back on and the ABS lights would stop. This may help until you get home.

Tom Ress
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post #7 of 13 Old Jul 14th, 2008, 1:23 pm
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Re: Alternating ABS Lights

The new GS-911 software will definitely reset the ABS on your bike. There is another thread on this board showing folks with this device. If you are in an area near one of these folks they may be able to reset it for you. This will at least let you know what triggered the fault.

Jeff in Myrtle Beach
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post #8 of 13 Old Jul 14th, 2008, 1:33 pm
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Re: Alternating ABS Lights

That's good to know Jeff. I have the new software but no bike to test it on so far.

John
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2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
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Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #9 of 13 Old Jul 14th, 2008, 7:15 pm
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Re: Alternating ABS Lights

I had this problem recently on my 2000 LT. I used the instructions on the long post above and found that I had a code 7 fault - ABS unit. I chose to take it to my dealer for a diagnostic. They found a "piston failure", did a "pump test", a reset and charged me one hour of shop time. I do not think that resetting without addressing the fault will solve the problem. There are more than a few reasons for having a problem, and using the procedure from the long post helps to decide what to do.
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post #10 of 13 Old Jul 14th, 2008, 8:01 pm
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Re: Alternating ABS Lights

Quote:
Originally Posted by bluesboy
I do not think that resetting without addressing the fault will solve the problem. There are more than a few reasons for having a problem, and using the procedure from the long post helps to decide what to do.
True but often it is just a build up of crud and full flush followed by a reset has cured many. By all means run the diagnostic.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
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2004 330 Ci Convertable
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But lack DE, MA, RI and CT with the 2005 LT

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post #11 of 13 Old Jul 14th, 2008, 8:09 pm
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Re: Alternating ABS Lights

Quote:
Originally Posted by OKUIII
Sorry ..........I forgot to say that my bike is a 2000. Its been great and never had a problem... I am away from home and have no way to keep charge up and I let battery go too low.
When you get a new battery, and if it's still wagging, the next step I would take would be to check the wheel sensors for gap and clean them.



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post #12 of 13 Old Jul 14th, 2008, 8:26 pm
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Re: Alternating ABS Lights

Quote:
Originally Posted by bluesboy
I had this problem recently on my 2000 LT. I used the instructions on the long post above and found that I had a code 7 fault - ABS unit. I chose to take it to my dealer for a diagnostic. They found a "piston failure", did a "pump test", a reset and charged me one hour of shop time. I do not think that resetting without addressing the fault will solve the problem. There are more than a few reasons for having a problem, and using the procedure from the long post helps to decide what to do.
Not sure if you were responding to my post about the GS-911, I hope I made it clear that using the GS-911 will allow you to read any and all faults creating the wagging lights. It will also allow you to reset the lights once the issue has been resolved. Obviously if the issue has not been resolved the lights will come right back on as soon as the system cycles again.

Jeff in Myrtle Beach
'01 LTC
'99 Icon champagne
'02 KLR 650
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Honda R100R beater

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post #13 of 13 Old Jul 14th, 2008, 10:09 pm
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Re: Alternating ABS Lights

Quote:
Originally Posted by robasay
It has been suggested that the only way to clear ABS2 faults is by placing it on the diagnostic computer at a dealers shop. It can be done at home relatively simply.
Yes, clearing the faults is done relatively simply at home. My flushing of fluids at the ABS controller, installation of the jumper wire on pin 21, and the reset lasted all of 15 miles. Reset by dealer and they've been off since. I left the wire attached just in case, but I have a feeling if they start to alternate again, the dealer will have to be involved then too. The dealer charged me $27.00. They told me the original fault was a piston failure in the ABS contoller.

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