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Discussion Starter #1
Hello,
I have an 06 ST1050 ABS and I’ve got an issue with my rear lights, when I turn the bike on they are on along with the break light but when I press one of the breaks they turn off.
I’ve searched the forum and there seems to be an issue with the break light being stuck on when the bike heats up, not sure if this could be related.

Thanks in advance.
 

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Is the problem that brake and rear lights are both on, but when you actually use the brake lever the rear lights go out?
 

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So. Start bike, brake and rear lights are on. Apply brake, rear lights go out and stay out? What about the brake lights?
 

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Discussion Starter #6
When I start the bike, break light and rear lights are on.
When I press the break leaver, break light and rear lights turn off, the rear light stays off and the break light doesn’t work when a leaver is pressed again.
 

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When I start the bike, break light and rear lights are on.
When I press the break leaver, break light and rear lights turn off, the rear light stays off and the break light doesn’t work when a leaver is pressed again.
That's odd (but you already know that!) Looking at the circuit diagram, the rear light cluster earth appears to run to pin A06 on the ECU, which is shared with the diagnostic connector and the side stand switch. Is it an earthing problem/short somewhere? Does disconnecting one of the brake switches change anything? Did you try adjusting the rear brake switch, as Terry suggested?
 

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Discussion Starter #9 (Edited)
@DaveGPz I have tried what @terry said and also spend the best part of the weekend unplugging, reconnecting and cleaning connectors but had no luck I have had to concede defeat and put it into the garage.

Thank you for your help
 

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Sorry it didn't work out. The fact that it is so repeatable is odd. Maybe the light unit itself is faulty?
 

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@DaveGPz I have tried what @terry said and also spend the best part of the weekend unplugging, reconnecting and cleaning connectors but had no luck I have had to concede defeat and put it into the garage.

Thank you for your help
Please give us more details about what you tried and the detailed results.

Did you check the bulb itself?

At this point we have to change something in order to change the behaviour somehow this is the usual way to debug.

Fred
 

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Ok so I checked the wrong schematic. So 05 has bulbs and 06 has leds?
Î may have the gt schematic. I'll have a look tomorrow.

Leds are diodes so the behaviour is totally different.


edit:even on the GT the schematic represents them as bulbs...


Fred
 

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I took a look at mine and on the GT it's seems a real PITA to remove the tail light.
So what is suggest is that you remove yours:grin2:and take it apart provided it's not sealed forever. Then take pictures of the inside and send them to me.
Both side of the PCB. I'll try to understand the schematic. Component references must be readable. Could be that the schematic is more complicated that planned.

In the mean time, w/ the tail light module removed you may try to replace (for test purpose) the set w/ a simple led + resistor, for checking the bike side. As the bike side if pretty simple I don't see any fault coming from it.
That is two LED w/ two resistances in series.

For 15mA in each LED you need (12-1V)/0.015A=733Ohms. You can take 680Ohms or 820Ohms standard values.



Note: seems to be a lot of replacement for these light modules.

Fred
 

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Hello BA. I have a 2011 Sprint GT that had a faulty tail light assembly from the factory. It was replaced under warranty and all has been fine since. My point is that the L.E.D. assembly can fail in part or on the whole. Good luck chasing your gremlin.
 

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Discussion Starter #16
I have an update.
The tail light was replaced but that only fixed the break light issue, the running lights still didn’t work, it turned out to be an issue with the ignition so that was replaced and now it all works.
 
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