K11 Owners Group Forum Index K11 Owners Group
K11 Owners Group
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Turn signals and hazard lights not working
Goto page Previous  1, 2
 
Post new topic   Reply to topic    K11 Owners Group Forum Index -> Tech
View previous topic :: View next topic  
Author Message
Scott_Anderson
Site Admin


Joined: 05 Sep 2006
Posts: 3008
Location: Central Iowa, USA

PostPosted: Thu Aug 08, 2019 6:16 pm    Post subject: Reply with quote

Yep, it's called a "BMU" for bulb monitor unit.....
It is supposed to, as the name implies, monitor the brake lamp and light the red warning dash light if the brake lamp fails, or if either of the brake lever switches fail(startup test).

BTW, the BMU does not play well with LED lamps... Drake has written up a procedure to alter or bypass the BMU unit if you use an LED brake lamp.
_________________
Ride safe.


1997 K1100LT 0302488
1995 K1100LT 0302044
Garmin StreetPilot 2820
Garmin Zumo 550
"One who does not ask questions is ashamed to learn" Danish proverb
Back to top
View user's profile Send private message Yahoo Messenger
Jim
Site Admin


Joined: 17 May 2003
Posts: 3740
Location: WHERETHEFUNNEVERENDS

PostPosted: Fri Aug 09, 2019 12:03 am    Post subject: Reply with quote

Make sure you have a good German bulb in the brake light socket. I couldn't get Asian bulbs to work on the K. The bulbs were OK - the BMU didn't like them.
_________________
Jim
1997 K1100LTSE 94,000
1995 R100RT Classic 13,000 Beemered
1991 K75RTP 46,000 - in progress
1992 R100R 22,000 - FOR SALE

"Smokin' that stuff'll make you hurt yourself" Bonnie Rait​ (Vera/Taylor/Hirsch)
Back to top
View user's profile Send private message Send e-mail Visit poster's website
flybd5
Flying Brick Rider


Joined: 01 Jul 2019
Posts: 189
Location: Berlin, Germany

PostPosted: Fri Aug 09, 2019 2:09 am    Post subject: Reply with quote

I'm not getting any warnings on the dash. And German bulbs? Smile I think one of the two connectors related to this have become disconnected.
_________________
To err once is human. To do so repeatedly is incompetence.
1995 K1100LT SE
1982 Honda Lead 125
Back to top
View user's profile Send private message
flybd5
Flying Brick Rider


Joined: 01 Jul 2019
Posts: 189
Location: Berlin, Germany

PostPosted: Fri Aug 09, 2019 2:27 pm    Post subject: Reply with quote

The mechanic figured it out. The rear brake pedal activates the brake light just fine. It's the hand brake that doesn't work, and it makes sense, because that's part of where the bike landed when I dropped it, and the brake mechanism went south too, leaking fluid. He will replace it.
_________________
To err once is human. To do so repeatedly is incompetence.
1995 K1100LT SE
1982 Honda Lead 125
Back to top
View user's profile Send private message
Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 9672
Location: Bumf***, WA

PostPosted: Sat Aug 10, 2019 2:41 pm    Post subject: Reply with quote

The BMU:

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/bmu/bmu.htm
_________________
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
Back to top
View user's profile Send private message
flybd5
Flying Brick Rider


Joined: 01 Jul 2019
Posts: 189
Location: Berlin, Germany

PostPosted: Mon Aug 12, 2019 4:24 am    Post subject: Reply with quote

Flying Duck wrote:

And if you pop the innards out of it (easy to do) and follow that pin it will be connected to a trace on the printed circuit board.


Can you share the "easy to do" instructions to pop the innards of the flasher relay? Mine appears to be welded with ultrasound and the bottom where the connector is appears to be sealed with a black epoxy sealant.

Juan
_________________
To err once is human. To do so repeatedly is incompetence.
1995 K1100LT SE
1982 Honda Lead 125
Back to top
View user's profile Send private message
Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 9672
Location: Bumf***, WA

PostPosted: Mon Aug 12, 2019 1:32 pm    Post subject: Reply with quote

Welded with ultrasoujnd? Nah, There's just some expoxy or whatever. Just stick a screwdriver in around the edges and pop it open.

And in case you want to run LED turn signal bulbs you might want to do this while you have it apart:
http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/ledoemflrelay/ledoemflrelay.htm
_________________
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
Back to top
View user's profile Send private message
flybd5
Flying Brick Rider


Joined: 01 Jul 2019
Posts: 189
Location: Berlin, Germany

PostPosted: Tue Aug 13, 2019 4:35 am    Post subject: Reply with quote

Flying Duck wrote:
Welded with ultrasoujnd? Nah, There's just some expoxy or whatever. Just stick a screwdriver in around the edges and pop it open.

And in case you want to run LED turn signal bulbs you might want to do this while you have it apart:
http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/ledoemflrelay/ledoemflrelay.htm


The case is definitely ultrasound welded around the edges, but you can barely see it. I'll give that a try, but just to see if I can find what failed. I already installed a replacement relay and it works fine.
_________________
To err once is human. To do so repeatedly is incompetence.
1995 K1100LT SE
1982 Honda Lead 125
Back to top
View user's profile Send private message
flybd5
Flying Brick Rider


Joined: 01 Jul 2019
Posts: 189
Location: Berlin, Germany

PostPosted: Tue Aug 13, 2019 4:19 pm    Post subject: Reply with quote

I got it open. The casing is in fact ultrasound welded, rather than gluing the two molded halves together. You were right, the bottom where the connector comes out just had this simple glue. The housing on the connector popped off and I pulled out the board.

The pcb appears to be the same, but with different identifying stencil on the side with the transformer coils. This one has a symbol, then 4D, and below that 754093-A. The most significant difference is the absence of a number of components that are there on the picture on that link you posted. On the front the capacitor at top right is gone, on the back a whole row of what appear to be resistors is gone, among other things.

There's no apparent damage. Would be nice to have a schematic to troubleshoot it. I'll post pics tomorrow.
_________________
To err once is human. To do so repeatedly is incompetence.
1995 K1100LT SE
1982 Honda Lead 125
Back to top
View user's profile Send private message
flybd5
Flying Brick Rider


Joined: 01 Jul 2019
Posts: 189
Location: Berlin, Germany

PostPosted: Wed Aug 14, 2019 4:19 am    Post subject: Reply with quote




_________________
To err once is human. To do so repeatedly is incompetence.
1995 K1100LT SE
1982 Honda Lead 125
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    K11 Owners Group Forum Index -> Tech All times are GMT - 4 Hours
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group