Hi,

 

my first post here so hello !  I am after some help with a retrofit on a Skoda Yeti 4x4 Elegance (2014).

I managed to get some LED tail lights for a reasonable price, and researching the fit shows they are pretty much a straight swap with just one issue...  recoding the central electrics to avoid the bulb out warning.

 

I appreciate there are two options here, but as I suspect is the case for everyone, avoiding the 'resistor' work-around would be preferable.

 

So my question is "can anyone help with the coding of Byte 18", in order to disable the bulb check on the brake and tail lights, as required by the LED units ?

I have searched across many forums, contacted dealer and suppliers, and contacted Ross-Tech - all to no avail.

I realise Byte 18 seems to be responsible for the coding of the lighting scheme across the car, and there must be some mapping somewhere that explains the various values against the functions.

 

If it helps, the car has:

 

Xenon headlamps - active

LED strip DRLs (front)

Fog lights

 

Rear fog lights

Reversing lights

 

It is currently set to dim the DRLs when indicating to aid visibility of the indicator.

 

I have the full VCDS

 

I have a scan of the car, but it shows Byte 18 at value '00' as per all the related threads.

 

Can anyone help ?

 

Cheers.

 

 

You are best off asking Ross tech but they will probably give you the answer everyone gives:

Recoding byte 18 can often lead to undesirable affects to other lights (DRL's, fog lights etc.) once modified it cannot be reversed as you are unaware of the original code (it is masked as 00)

Even if you go through and try all the 255 possible combinations you may not get the full functionality back of all lights.

I had this on my mk2 so after much deliberation I fitted resistors to the LED rear tail lights, not ideal but won't cause you lots of potential hassle.

I think the VAS dealer tool modifies the EPROM directly when making changes to rear light behaviour (I had rear lights turned on all the time by the dealer)

Thanks

Thanks for your reply.

I did try Ross-Tech - someone called 'Andy' replied, but unfortunately was not able to help.

 

I really don't want to give up, but looks like it may be the resistor route until someone manages to unravel the mystery of byte 18...

There has been a previous thread about this very subject in the Yeti section, and I don't think an answer was found.

in the past I have used vas pc or odis to alter the settings within the CEM when led lights have been fitted. The alterations made are not available on vcds and can't be viewed. its possibly hexadecimal coding within non displayed areas of the CEM software.

seat Leons and audi a4s are a common one.