BMW K bikes (Bricks)

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1Back to top Go down   hazard lamp and BMU Empty hazard lamp and BMU on Mon May 25, 2015 5:12 am

Noeloakes

Noeloakes
active member
active member
Hello All,

I recently decided to add a second tail/ stop lamp to the K1100LT, mounted to rear luggage rack. Just spliced the wires from existing set up. Noticed that hazard lamp is now pretty much constantly lit ( goes out after first deploy front and back brakes as normal but then comes on again) will now only go off if brakes are engaged. 

Is it just the Brake Monitoring unit getting confused since I spliced to second tail light or something more critical? if the first and no harm likely I will leave it as is ..... any advice greatly appreciated, 

Ride Safe, Go the Aussies.....

    

2Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 5:49 am

td5

td5
Gold member
Gold member
Easiest way it to remove one of the bulbs and see if the light goes out. I honestly thought that if a bulb failed it came on not if there was too much current drawing.
I'd give it a go and see what happens, if it is perhaps an LED.

    

3Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 6:20 am

charlie99

charlie99
VIP
VIP
had a similar thing happen noel

for me it was the earth connection to the rear tail lamp,   somewhat intermittent

a clean up of the lamp housing solved the issue

I have a feeling that the current monitored to the lamps must equal a certain amount ...but not less
so when the tail lamp became corroded ....and later when it became a bad filament and low out put ...bloody globes

the bmu lamp came on

same goes for the brake lamp

I guess the same for the indicators

there seems to be 3 sensors - circuits in the bmu  so surmising... tail ...brake ...and indicators

deoxit ..is a great product for cleaning up connections

good luck !


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Ohazard lamp and BMU Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

4Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 6:30 am

Inge K.

Inge K.
VIP
VIP
@charlie99 wrote:there seems to be 3 sensors - circuits in the bmu  so surmising... tail ...brake ...and indicators

Yes, it's 3 sensors, Charlie.......front brake, rear brake and tail.
------------------------------------------------------------------------

On the other hand, I would guess that it isn't so good idea to pull more
current through the BMU than it's designed for.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

5Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 6:36 am

Noeloakes

Noeloakes
active member
active member
thanks all for replying, Charlie , I your post you mention BMU lamp? to be clear is that the same lamp I am calling the hazard lamp located in middle of speedometer?  thanks in advance ..

    

6Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 6:43 am

Holister

Holister
Life time member
Life time member
@Noeloakes wrote:.....
I recently decided to add a second tail/ stop lamp to the K1100LT, mounted to rear luggage rack. Just spliced the wires from existing set up. Noticed that hazard lamp is now pretty much constantly lit ( goes out after first deploy front and back brakes as normal but then comes on again) will now only go off if brakes are engaged.
....
That's not the hazzard lamp, its the bulb fail warning light.
The BMU monitors as Inge said, the tail and brake lamps in conjunction with the front and rear brake switches.
Indicators are monitored and controlled by the Flasher Control Unit


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  hazard lamp and BMU Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

7Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 7:01 am

Noeloakes

Noeloakes
active member
active member
Excellent,  thanks for clearing up the actual warning light for me. so, if all actual stop lamps and indicators are working correctly it is either a bad earth or the fact that I am now drawing more current from the system since I mounted secondary tail/brake light unit which is causing BMU to activate bulb fail lamp to come on?

    

8Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 7:14 am

Holister

Holister
Life time member
Life time member
@Inge K. wrote:........
On the other hand, I would guess that it isn't so good idea to pull more
current through the BMU than it's designed for.
+1

The BMU can be removed if you want to run more wattage but you'll need to jump the connections in the base to ensure continuity in the tail and stop circuits.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  hazard lamp and BMU Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

9Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 7:22 am

RicK G

RicK G
VIP
VIP
The BMU does not monitor the indicators that is done by the flasher relay which will flash quickly if a bulb is out.
The red light in the centre section does act as a bulb to monitor the Hazard flasher if it is fitted.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

10Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 7:28 am

Inge K.

Inge K.
VIP
VIP
Kaptain Holister wrote:
@Inge K. wrote:........
On the other hand, I would guess that it isn't so good idea to pull more
current through the BMU than it's designed for.
+1

The BMU can be removed if you want to run more wattage but you'll need to jump the connections in the base to ensure continuity in the tail and stop circuits.

Or add a micro relay for the extra tail lamp....unless it's a low consuming LED.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

11Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 7:30 am

Inge K.

Inge K.
VIP
VIP
@RicK G wrote:The red light in the centre section does act as a bulb to monitor the Hazard flasher if it is fitted.

No, but both flasher indicators in the instrument is flashing.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

12Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 9:29 am

RicK G

RicK G
VIP
VIP
@Inge K. wrote:
@RicK G wrote:The red light in the centre section does act as a bulb to monitor the Hazard flasher if it is fitted.

No, but both flasher indicators in the instrument is flashing.
Yes quite right then why the hell did BMW put a double triangle which is the international symbol for hazard lights in it. Well I suppose any mob who calls a speedo a tacho has got to be a bit strange.  Ah Ha I am thinking of my car that has the double triangle in a rectangular red lamp and the indicator lights on the dash also flash.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

13Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 9:37 am

Inge K.

Inge K.
VIP
VIP
To make your confusion complete.........early K's did have a bulb behind the
double triangle in the switch.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

14Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 9:53 am

RicK G

RicK G
VIP
VIP
Thanks Inge I really needed to know that, Hmmmmm think I'll find a dark Korner and sulk Laughing


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

15Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 10:14 am

Holister

Holister
Life time member
Life time member
It caught me out at first but the symbols for hazard sw and BMU warning lamp are only very slightly different... so don't sulk too hard Rick


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  hazard lamp and BMU Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

16Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 10:22 am

Noeloakes

Noeloakes
active member
active member
thanks to all for the advice. I think I kinda got it now. if I leave it as is and live with the BMU light staying on it should not cause any real  harm right? or not?

    

17Back to top Go down   hazard lamp and BMU Empty Re: hazard lamp and BMU on Mon May 25, 2015 11:10 am

RicK G

RicK G
VIP
VIP
It does mean there is a problem. I have had a similar experience to what Charlie was talking about, it was a failing bulb that was working but not good so I changed it and all was good.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

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