Finally got managed to get and swap full set of ergo seats from Octavia 4. Rear seats also fits 1:1 :D Front seats both have massage and ventilation. Ventilation still is in process as need to change BCM and Climatronics, but lets see how it will end. Any way, I am satisfied with this seats, very comfy and memory seats works as they should.

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Later will bring car for detailing cleaning, so seats and interior will be cleaned well.
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Here we can compare original seat vs swaped one...
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I was be successful in enabling ventilated seats in this car.
All necessary wires I was pulled already with seats retrofit...
First of all I changed BCM to HIGH version to get needed LIN outputs.
After coding and testing that ventilation is possible to turn on (and working) by OBD11 I went for buying climatronic from Passat B8.
Received climatronic, it was working after correct configuration, and software update for climatronic itself as it was supposed to work with MIB1 unit not with MIB2.
Only thing was, its not possible to turn on ventilation by physical button on clima if heated seats was turned on last (it remembers last thing - heating or ventilation) switch over these "modes" is on MIB2.
As Seat MIB2 software not support this kind of switchower graphics, I went for cross flashing to other brand software. I started with skoda software, everything was working as expected and I was happy, but then I realised that MIB graphics are too "škoddy" and I wanted something more neutral, so went for VW software. Then I changed graphics to seat images and at the end I have MIB unit with VW software and more or less with seat graphics in it. For me its ok solution, as I can now turn on seat ventilation on and switch over to seat heating also.

Ahhh, almost forgot, Passat climatronic not fit well in seat dash, there is different shapes of buttons (at least I did not liked how it look) so I decided to transfer passat electronic board to seat clima housing - boards are identical by means of button positions and dimensions, so after swapping boards everything works great. Probably one day will get to laser tool and engrave "ventilator" signs on seat heating buttons.. :)

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