K11 Owners Group

MCRyder · Posted: Thu Jan 17, 2008 1:07 pm Post subject: ABS II Tech Question

I've got the ABS I on my bike. But a friend who's been helping me with my fuel pump problem asked me a question about his ABS II system that I'm forwarding to the K11OG:

"When I bought my RS, 4 years ago, the lights were flashing. I took it to the BMW shop and they "reset" the system and it never failed again. Recently the lights don't go out when I first start off. I can go a block, shut it off, restart, ride off and they immediately go out...any ideas on that one? pj"

Any feedback? Thanks.
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Mark Rooney
Tyler, TX
'93 K11RS
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Flying Duck · Posted: Thu Jan 17, 2008 1:22 pm Post subject:

1) Battery nearing the end of it's life. ABS brains are sensitive to low voltage.

2) Bad electrical conncetion. ABS sensors, ABS brain harness, possibly battery terminals.

Wouldn't hurt to check the spacing on the ABS sensors either or there may be some dirt in the gap.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
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Jim · Posted: Thu Jan 17, 2008 1:41 pm Post subject: ABS lights

since the lights go off after riding, I'd say it's probably the battery. If pj has a battery tender, he can try keeping it on the charger. If that resolves the ABS light issue, then it's most likely the battery.
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

BMGraeme · Posted: Fri Jan 18, 2008 5:18 pm Post subject:

Battery - no doubt about it.
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1980 CB900FA
1994 K1100RS
2008 R1200GSA

windcaper · Posted: Sun Feb 10, 2008 3:24 pm Post subject:

I have been through the same scenario twice, and judging from what you describe, I would suggest changing the battery. It probably isn't operating at 100% and the ABS is very very sensitive to low voltage at start up, which is why after the battery takes a little "boost" in charge the fault disappears. I have spent a lot of money only to figure out I need a stickin battery.
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1996 K1100 RS SE

chopper_harris · Posted: Sun Feb 24, 2008 8:08 am Post subject:

Folks

I've just finished the restoration of my K11 LT, and can confirm that the above is 100% correct.

My 1994 ABS II dashboard is different to that described in the sticky threads, but appears to function the same.

There are two red ABS lamps (highlighted in white), and the brake warning lamp extinguishes when both brake controls are tested.

I observed the following :

Ignition on - Both ABS lamps flash, in sync.
Start engine - Both ABS lamps flash, alternately
Press ABS Reset - Left lamp extinguish, Right is constant.

During cranking, the battery voltage dipped to 10.6v Shocked

So, I hooked up a portable jumpstart tender in parallel :

Ignition on - Both ABS lamps flash, in sync.
Start engine - Both ABS lamps flash, in sync.
Disconnect second battery
Ride Off - Both ABS lamps extinguish.
Smile, go and make pot of tea.

Follow the test steps slowly, and logically - you will find the culprit Cool

_________________
C1 200 (2001)
R100 RS (1990)
NSU Quickly N (1964)
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Kawasaki KLV1000 (2005)
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mnb · Posted: Sun Feb 24, 2008 3:52 pm Post subject:

Happens to me every so often on my '96 LT. Usually when I don't put it on the tender for 4-6+ weeks during winter.

It means you're battery won't charge up as full as it used to, so it's can't deliver enough voltage to start and init the ABS system.

The best solution is a fresh battery, but this will get you by:

Start the bike, warm it up a little bit, drive off. Not the alternating flashing.
Drive a block or two just to ensure it's slightly warm.
Shut the bike off.
Turn the ignition off and then back on.
Start the bike
Drive away. ABS should init properly since it takes less juice to start a warm bike.

That has almost always worked for me.
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M N B
1997 BMW K1100LT ABS Special Edition
2003 Husqvarna TE610e
2007 Harley Davidson Road King
2009 BMW F800GS
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ChrispyChicken · Joined: 24 Mar 2008 Posts: 2 Location: Denver, CO

My question is not exactly for a K11, but is similar:
Does anyone know anything about the ABS warning light blinking as a permanent result of a low battery? I read somewhere that the ABS brain can be damaged from a battery that was too low?
It's a 91 K1 that has the problem; bought the bike last year and judging from the tape residue over the ABS light, it must have been a problem that's been around awhile.
I haven't taken it to the dealer to have it "reset" though. Is there a way I can do the reset? Or is it worth having the dealer try?
Guess that's it from me. Your thoughts are appreciated.
_________________
80 R65
91 K100RS
94 R1100RS
91 K1 (babysitting for my brother)

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chopper_harris · Posted: Wed Apr 02, 2008 8:15 am Post subject:

This is an FAQ - described in detail on the Tech pages Rolling Eyes

http://www.k11og.org/forum/viewtopic.php?t=2110

Your K1 will have ABS I (two separate cylindrical actuators). The answer is appx 1/3 way down the page, but it will be good primer for you to read the full thread Smile

_________________
C1 200 (2001)
R100 RS (1990)
NSU Quickly N (1964)
Honda 400/4 F1 (1977)
MotoGuzzi 1000C (1978)
Suzuki TL 1000 R (1999)
Kawasaki KLV1000 (2005)
K12R Sport (2007) - Wifeys