I can't recall seeing a byte for the number plate lights, that's not to say there isn't one as I wasn't really looking for it. I know all interior lights can be changed to LED without any codes coming up, it's just the external lights that will give a code.
Best advice I could offer is try and get the coding off a MY12 car that has them standard and the we'll see if earlier models can be retro-coded.
Bookmarks