Constant power to brake light.

[karnevil]

2006 1200GS ABS and Servo.

Should there be a constant low volt feed to the brake light filament when ignition turned on?No not the rear lamp/No.Plate filament the brake light filament.

Thanks.

 

[Wapping]

At a guess, maybe yes.

Based on nothing more than the Canbus / self-check system probably needs to power items slightly to make sure they are there / work.

 

[karnevil]

Well I wondered that BUT why the brake light and not indicators the brake only works intermittant like indicators.

Or is it a canbus check for the ABS/Servo?



OR and the one I favour

A back up for if the main rear filament fails.

 

[Wapping]

Can't remember if a failed indicator bulb pops up on the diagnostics? Doesn't it simply give a warning by the odd flashing speed of the remaining bulb?

/ lamp / globe (just in case anyone gets upset)


===

The residual second wire fall back idea I am though liking.

 

[karnevil]

Can't remember if a failed indicator bulb pops up on the diagnostics? Doesn't it simply give a warning by the odd flashing speed of the remaining bulb?

/ lamp / globe (just in case anyone gets upset)


===

The residual second wire fall back idea I am though liking.

According to my manual I will get a bulb symbol and an arrow indicating front or rear for a side/head or tail brake and for anyother bulb a bulb symbol with both arrows.


However I have LampF on my display

(Does the display show LampF for front and LampR for rear or just LampF for Lamp Fail?)

Have just gone to the bike and removed a rear nearside indicator bulb.LampF displayed.And of course a rapid flash rate.

SOooooooooooo that means the system senses the bulb fail when power is sent to it.

Therefore I am thinking that my guess at residual power may be correct.

Which means the LED lamp unit I have maybe needs a resistor which will block the low level voltage which makes the brake display all the time.



Does that make sense?

 

[shugie]

If the canbus controller senses the tail light filament has gone AWOL (or perhaps in your case that the LEDS are too high a resistance) then I believe it can send a lower voltage than usual to the brake light so that it illuminates dimly, when the brakes are on it goes to normal brightness.

You might need a resistor in parallel with the tail light LEDs to fool the canbus controller into thinking all is well. From previous discussions, I believe someone used 68ohm 3W resistors to solve the problem.

 

[karnevil]

If the canbus controller senses the tail light filament has gone AWOL (or perhaps in your case that the LEDS are too high a resistance) then I believe it can send a lower voltage than usual to the brake light so that it illuminates dimly, when the brakes are on it goes to normal brightness.

You might need a resistor in parallel with the tail light LEDs to fool the canbus controller into thinking all is well. From previous discussions, I believe someone used 68ohm 3W resistors to solve the problem.

Ah right I see.
Yes that makes sense.The low voltage is not there all the time just when it senses a drop,but still has power to the rear filament which still lights the LED's due to their lower demand BUT ALSO now illuminates the brake circuit LED's which display at "full volume" due to their lower power demands.

Looking at it now my OLD defunct rear LED lamp appears to have a resistor set up in it I will graft it on to this new lamp and see what occurs.


EDIT..
P.S.

The info regarding the backup lamp is in the owners manual.
I did read it when I got the machine in 2006 but obviously did not inwardly digest fully.

Maybe a re-read is in order,once the latest Pratchett is finished!

Thankyou all for your input.