Will be working on a writeup for those interested in the process. For now this is what I have for you..
It's not as straightforward as simply swapping seats, swapping a module, and calling it a day when swapping in Audi seats to a VW on the MQB platform.
- While the seats from any Audi 8V A3/S3/RS3 physically will bolt straight in, they are NOT plug n' play with the MK7.
- aside from the airbag harnesses, nothing else is physically compatible as-is, and even then there are differences.
- Not all MQB Golf / GTI / R have the same main harness(es) - appears to be different with pre-post FL
- Repining of basically ALL wires at level of seat/car coupling is required.
- there is more than one way to 'skin this cat', which for you may or may not require skinning your seats.
As of a few weeks ago everything has been tested and confirmed working 100%. Power, heat, occupancy sensor, airbags, position sensors, seatbelt sensors. Everything was done as if it were from factory including proper crimping of new pins and repining - seats now plug in and out just like the original seats.
Seats also function 100% as intended physically, no issues. The only thing I now have to complete is wiring in the rear ambient footwell lighting. Parts are on order for me to build the necessary harness for this as well.