Hi All, 

My vehicle is1Z3 Octavia MPI 1.6 2008 and I love to modify my car and make it better, so I cam with an idea for more tail light and back turn signals visibility so I bought the led tube you can see attached in the picture with 2 colors, 1 red for the break and 1 yellow for the signal and the yellow one is sequence light type same like Lexus and some advanced car. 

I connect both to my tail light and the red one works perfectly however the yellow one as you can see in the picture work only partially and would work fully only if I break with it. 

So far I'm not able to identify the reason to fix so here we are, maybe anybody here can help me out. 

Cheers folks. 

Are the LED strips CANBUS-friendly?

 

Your car monitors the activity of the bulbs, and when it detects something wrong (such as a blown or failing bulb), things don't work as expected. It does this by measuring resistance.

 

As LED's use a lot less power than regular incandescent bulbs it is likely they simply aren't compatible with the Octavia?

 

 

They are not canbus friendly for sure however it doesn't really matter because I took a line from the original bulbs and I didn't disconnect the original ones therefore there is no error showing in my dashboard and the lights are working normally. 

Thanks for your comment. 

Faulty unit(s)?

 

Try them directly on 12v and see what happens.

I tried them directly on the battery and they work fine so faulty is out of the table. 

Edited 6 January, 20197 yr by abdallah

If you've wired them directly off the regular incandescent bulb, could it be that the LED's aren't getting power for long enough for them to finish their sequence?

 

I'm assuming the regular indicator bulb only needs a short burst of power, on - 1 second / off, on - one second / off etc.

 

Perhaps your new strobing LED tubes need more than 1 second to ensure all of the LED's get their chance to illuminate before the power supply is interrupted?

 

Edited 6 January, 20197 yr by silver1011

1 hour ago, silver1011 said:

If you've wired them directly off the regular incandescent bulb, could it be that the LED's aren't getting power for long enough for them to finish their sequence?

 

I'm assuming the regular indicator bulb only needs a short burst of power, on - 1 second / off, on - one second / off etc.

 

Perhaps your new strobing LED tubes need more than 1 second to ensure all of the LED's get their chance to illuminate before the power supply is interrupted?

 

I have thought about that as well and I think this is the only explanation for this, thanks for confirming my thoughts however I don't think there will be a solution for that as I can't change how long the signal goes on or off. 

Please olif you have any idea let me know. 

Assuming the LEDs have a built in controller and need a constant 12v and not an intermittent as is required to flash an incandescent bulb...

 

Maybe take a feed from the bulb to a relay with a capacitor in series to provide a power buffer/delay just long enough to allow one full cycle of the LEDs. I'm no sparky but I think that's the easiest solution although there will be a more elegant way I'm sure.

On 07/01/2019 at 03:51, MicMac said:

Assuming the LEDs have a built in controller and need a constant 12v and not an intermittent as is required to flash an incandescent bulb...

 

Maybe take a feed from the bulb to a relay with a capacitor in series to provide a power buffer/delay just long enough to allow one full cycle of the LEDs. I'm no sparky but I think that's the easiest solution although there will be a more elegant way I'm sure.

Thanks for the suggestion micmac

I would have also suggested a capacitor as one route though not sure how it would react to a non constant current and a draw on the other side. Some kind of switching relay and separate 12v circuit might be a way to make it work but seems like a lot of work.

You are right, it is to much work, Im thinking if there is any option in the vag to increase the signal light time to be 2 seconds instead of 1

Its probably a function of the bulb monitoring where the current is limited by a resistor and the volt drop measured across said resistor, downstream of that you are creating a potential divider by wiring your christmas tree lights in parallel with the indicator bulb, neither of them will be seeing 12 volts.

 

Simplest solution would be to use a trailer electric canbus relay.

Edited 8 January, 20197 yr by J.R.

Seek the advice of an auto electrician, it will be easy for them.

 

There may even be a video on YouTube showing the fitting process, not necessarily specifically for the Octavia but applicable.

 

I'm confident any bulb monitoring warnings could be stopped by editing with VCDS or similar.

 

Out of curiosity, can you post a link to where you bought the LEDs?

I will try to find some work around for it.

Actually I bought from AliExpress, just open the app and search for fixable drl and you will find a lot of options including this one.