K11 Owners Group

philosophicalzombie · Posted: Tue Apr 26, 2022 11:15 am Post subject: Bulb Monitoring Unit works!

Friends:

After start up, the hazard light (exclamation mark in a red triangle) on the instrument panel of '93 K1100RS normally stays on until I tap both brakes. Then it normally turns off (just like the ABS light stops blinking after moving a few feet) per the BMU protocol. Just recently it hasn't been turning off, and after spot checking I've found that my front brake isn't triggering the brake light. The rear brake performs as expected. Both brakes work fine.

So 1). thank you BMU for letting me know, and 2). what's the troubleshooting routine for this? I recently rebuilt the front brake MC so logic tells me I'm somehow responsible for this. Thanks. - Blake
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Blake
Mariposa, CA

1993 K1100RS Mystic Red

Flying Duck · Posted: Tue Apr 26, 2022 12:42 pm Post subject:

Find the front brake switch connector under the tank.

Gray/red and green black wires. Short the bike side of the connector to see if that lights up the brake light and makes the BMU go out.

Or see if the brake switch side of the connector has continuity when the brake is applied.

Cheaper non-BMW switch:
http://www.motobrick.com/index.php?topic=13958.0
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93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

philosophicalzombie · Posted: Wed Apr 27, 2022 2:47 pm Post subject:

Thanks Duck (as usual). Will do. - Blake
_________________
Blake
Mariposa, CA

1993 K1100RS Mystic Red

Grunter · Posted: Thu Apr 28, 2022 5:57 pm Post subject: Brake Monitoring Unit

The BMU fitted to most K bikes from the K75 through to the K1100 was a superb addition to safety. Now I have sold my last K75 and bought a R1100rs that is one thing I miss more than anything else.

Why ditch it, a safety device such as that, is as far as I know, never been used by any other manufacturer. It is unique. It would not cost a lot for one to be fitted at the factory from new instead of silly accessories such as heated seats and tyre pressure monitors that have a habit of going wrong anyway. A real retrograde step.
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1997 K1100LT
1994 R1100RS

Flying Duck · Posted: Fri Apr 29, 2022 12:12 pm Post subject: Re: Brake Monitoring Unit

Grunter · Posted: Sun May 01, 2022 11:28 am Post subject:

I have never ridden a bike with Canbus but they were never fitted to the R1100/1150 bikes it was just dropped. No explanation given. I could understand it if it were a failure or a source of problems, but as far as I know there wasn't.
Like wise the auto switching off the indicators after a turn had been made. With thick gloves it isn't always easy especially in bad weather.
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1997 K1100LT
1994 R1100RS

Scott_Anderson · Posted: Mon May 02, 2022 7:58 am Post subject:

Flying Duck · Posted: Mon May 02, 2022 10:54 am Post subject:

Did the earlier R bikes have BMUs?
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Scott_Anderson · Posted: Mon May 02, 2022 6:18 pm Post subject: