True CANBUS error free LED red brake lights.

[Twin_Dad]

I think the bigger issue here is why isn't there someone clever enough to change the baseload value so that LED's can be used with error checking still in place. there are some very clued up people here and someone must have an idea how to.

[fastlane]

I think the bigger issue here is why isn't there someone clever enough to change the baseload value so that LED's can be used with error checking still in place. there are some very clued up people here and someone must have an idea how to.

Agreed! Someone smart enough please chime in LOL!

[wai]

Agreed! Someone smart enough please chime in LOL!

If you can disable it, then there must be a way as disabling it would have to tell the circuit that all is well. It comes down to being able to re-program it to accept lower trigger amps. The problem is that a firmware upgrade would see any programming reversed.

The best way would be to get into VW's ear and have them make the change where you would have an option for LED bulbs or incandescent bulbs. This way it would not affect any of the existing fleet or their pricing, but give owners the ability to use LED bulbs.

It would be sold on the lower energy consumption and hence "greener". There is a trigger threshold at the moment, all that has to change is this value. It might mean having to replace all bulbs, but should be possible.

[fastlane]

Yes it does sound like that is all that is required. I doubt highly VW would ever help with that, hoping we have some techies that are switched on with this. I really want to avoid playing around and then damaging something else LOL!

[ecks]

Does anyone have spare stuff floating around?

Looking at the wiring diagrams, it's all powered by J519, which correlates to 09: Cent. Elect on the CANBUS.

We probably all already knew that. Does anybody have a spare one floating around? 09 has a few subsystems as well, so it's not entirely clear cut. Obviously you wouldn't need the RLS to tinker with...

You would need to work out what the range of the "Open/Closed" circuit detection is, and whether it's fixed by some kind of hardware, or adjustable in software. Obviously if it's the former, reprogramming won't be able to fix it.

If it's fixed in hardware, you could possibly throw together a CAN device (Arduino anyone??) to listen to the bus for light signals, and close the circuit with a 3 Ω resister (Hardware relay?) except when the lights are expected to be illuminated. Then you wouldn't be wasting power heating up a resistor at least...

Hmmm... as if I don't already have enough projects on my plate...

[ecks]

Surely someone has replaced the central electrics on their vehicle that we can mess with...???

[readerr0r]

But you can just disable the light checking with VCDS?

[ecks]

But you can just disable the light checking with VCDS?

Of course, but where's the fun in that?

[nomadx38]

I think it's more or less a lost cause trying to solve this. Unless you fool the module to think the led is pulling more power than it is (through a load resistor) you will only be able to turn the diagnostics off.

Factory fitted Xenons and side repeater (indicator) led's have the diagnostics turned off becuase it messes with the ballast (or in the led's case just throw up an error) providing less volts an amps than required to start the globe. I am to assume that if they can't tell the computer to not supply power when off and check to see if its pulling 35~ watts when on to check the status of the globe then I think it's set in hardware to just to send out the same pulse on all circuits with diagnostics enabled all using the same volts and amps.

Load resistor seems the best option.

Also ECKS you said somthing about a wiring diagram? Do you have a hard (or soft) copy or is it from ERWIN? I would love to have a wiring diagram for my car. Would have made it a lot easier to wire my Xenons in that's for sure!

[GTI JOE]

A far much easier solution.....live with the check light on, doesn't bother me at all. Replaced brake and rear indicators with LEDs, they look far better than OEM, with that minor inconvenience of course. The seller gauranteed CANBUS error free, but none are and hasn't got back to me..says a lot.