Lexus Ux 250h electric heated seats wiring harness

[roces777]

Hello to all!

I just bought a Lexus Ux250h recently with base package, normal non-heated and non-electric seats, and after a few weeks, I got a very good deal on some nice seats ( full interior) which have electric adjustments and heating.
Having retrofitted heated seats before in 2 different lexus Is's (plug&play), I was almost sure that that wiring harness were there in this Ux too. But I had a very unpleasant surprise. There are not. Not even a + wire for the electric motors. I want to do anything to retrofit these seats, I got the central console buttons which had the wiring and work, but there is nothing coming to the seats.
If someone already did this or has more experience about this subject, please offer me some tips.

I tried to play wit the Lexus wiring diagrams a little and figure things out, but not being a car mechanic, it will take me some hours or days to understand things. Anyone with more experience can give me some shortcuts to understand the diagrams better?
I also found online a floor wiring harness coming of a model which had electric-heated seats, but it is pretty expensive and I don't even know if buying them will fix the problem.

Thank you in advance!

[ColinBarber]

Not sure if the body ECU is different, not just the loom. I doubt anyone here has attempted this.

[Don C]

You could do worse than spen four euros on Lexus techdoc where you can trace the wiring back to source.  It probably has a sub loom rather than a complete one.