Information regarding custom Elmo's chips found in bmw equipment

I ve been searching the internet for a couple of weeks now in search for anny kind of information/ pinout/ datasheets regarding this chips . If anyone has somme info regarding this chips it will be much appreciated

All that i can found its this :

elmos 10026b (lin k-bus transciever) its found in steering wheel controls from bmw e46 ( it has an integrated voltage regulator, i'm still waiting confirmation regarding this info )

elmos 10020b (lin k-bus transciever) ist found in trunk cd changer or instrument cluster from e46

elmos 10012a (lin k-bus transciever) its found in gm5 module ( comfort module ) from e46. it supposed to be equivalent with Elmos E910.15 (datasheet attached) but it has a few extra pins

If anyone has somme info regarding this chips it will be much appreciated.

e910_91.pdf (256 KB)

Does this one look any closer ?

Elmos 910-05.pdf (178 KB)

I was wondering if you ever found a datasheet for the 10020B or any of the ELMOS K-Bus chips for that matter?

Thanks!