ABS problems - BMW Luxury Touring Community
 
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post #1 of 8 Old Dec 19th, 2006, 4:41 pm Thread Starter
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ABS problems

Hi All,
well I thought it was the blue wire - had the ABS warning light light come on (alternating 1 Hz warning) and since I had this happen before I suspected the blue wire which goes onto the small tab directly on the alternator.
After wiggling the connector around and turning the bike back on the ABS warning did not come on again and I thought all was fine. Until a few days later when it happened again. Wiggling did not help this time so I decided to pull the battery and take a closer look. After cleaning the tab on the alternator with some sand paper close inspection of the female connector on the blue wire revealed that the wire had come loose in the crimped part of the connector I decided to cut it off and put a new connector on (from Radio Shack). Now the connection feels very solid and it has continuity but - the ABS warning is still on. Do I have a bad ABS unit? What else can I look for? The blue wire goes into the wiring harness close to the battery where does the other end go? Any advice will be greatly appreciated.
Thanks,

~~~~~~~~~
Fascinating.
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post #2 of 8 Old Dec 19th, 2006, 6:57 pm
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Check your brake fluid resevoir for low fluid level.

Dave
Monkton, MD
and Pawleys Island, SC
2002 K1200LTC
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post #3 of 8 Old Dec 19th, 2006, 9:21 pm
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Exclamation ABS problems

There are 2 locations to top off brake fluid. One behind the other.
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post #4 of 8 Old Dec 19th, 2006, 9:21 pm
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The fluid level is possible as just one problem. Since you've seen to have had issues with the blue wire, I suspect that you now have a hard ABS fault in the computer caused by a low battery level since the charging system hasn't been working. If that is the case, the faults will have to be cleared by the dealer. By getting them to clear the faults, they will also test the ABS unit in the process to make sure that you don't have a hard ABS failure.

JM2CW

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post #5 of 8 Old Dec 21st, 2006, 1:57 pm
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Back to the brake fluid, ON the rear brake master cylinder there is two reseviors. Top these off before chasing for other problems. When this has happened on most of the bikes, the cause is the most aft (Rear) resevoir being not even low but a little fluid added here stopped the problem....
Steve
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post #6 of 8 Old Dec 27th, 2006, 1:53 pm Thread Starter
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Quote:
Originally Posted by k2steve
Back to the brake fluid, ON the rear brake master cylinder there is two reseviors. Top these off before chasing for other problems. When this has happened on most of the bikes, the cause is the most aft (Rear) resevoir being not even low but a little fluid added here stopped the problem....
Steve
Thanks Steve, I'll check that first and see whether the warning goes away.

~~~~~~~~~
Fascinating.
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post #7 of 8 Old Dec 30th, 2006, 9:59 pm
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Stopped the Flashing (ABS that is)

Had a short event with the ABS and General Warning light wobble on/off myself this weekend. While it was raining and in-between football games I accessed the rear reservoirs and topped off both with a little DOT 4 fluid and everything is back to normal. Note: My rear-forward reservoir was down by less than 5 cc's, but that was enough to light them up.
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post #8 of 8 Old Dec 31st, 2006, 9:55 am
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Quote:
Originally Posted by Steve_R
The fluid level is possible as just one problem. Since you've seen to have had issues with the blue wire, I suspect that you now have a hard ABS fault in the computer caused by a low battery level since the charging system hasn't been working. If that is the case, the faults will have to be cleared by the dealer. By getting them to clear the faults, they will also test the ABS unit in the process to make sure that you don't have a hard ABS failure.

JM2CW
I agree with everything Steve says. Before you take it to the dealer though. Check your battery output. Low strength can and will cause the ABS lights to flash.

Also, several years ago I had the dreaded blinking red lights on my K75SA. Battery was fine and I used a jumper wire to clear the ABS circuit of any false readings. Still no go.

I then decided to use a clean dollar bill to buff the sensor on each wheel in case it was dirty. (Old airhead riders, including me, remember using a clean dollar bill or business card to clean dirty points: same principle)

That was when I found my problem--and no it was not dirty sensors.

Dealer had recently put new front tire on bike and had installed the wheel backward on the bike! Sensor was on wrong side of bike from its mate. Interesting.....New dealer now!

Tom

Tom

2003 R1150RT, Black Beauty--this is one sexy bike!
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1992 K75SA, If this engine had been 4-valve instead of 2, it would be the smoothest BMW ever built!
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