Assistance with Coding for New Seats

[bake]

I swapped fox red seats into my 2013 E93 (convertible) and the issue I am having is the replacement seats came from a 2008 donor car. 2008 cars did not have the active head restraint system, so I was told all I had to do was to code the headrest restraint out for both front seats and I should be good. Let me also add that the fox red drivers seat had a deployed side airbag when I purchased it.

To begin I replaced the side airbag in the drivers seat and also learned that I needed to replace the seat belt receptacle (tensioner), so I replaced that as well. The airbag in the passenger seat did not deploy, so I left that seat belt tensioner in place. I had a remote coder code out the active headrest restraint system using Tool32, but we were unable to clear the airbag restraint system errors. He also tried INPA with no success.

I brought the car to a local shop that has ISTA and he is saying that both seats are still showing a seat belt tensioner fault. This is weird as I swapped the seat belt tensioner from my fully functioning 2013 drivers seat, so I am 100% sure it was not "blown". Now the car has an additional 2nd harness (in addition to the large seat harness) that plugged into the original 2013 seat, which the replacement 2008 seats does not have. I was assuming this harness was for the active restraint system, but maybe it has something else in the harness as well that needs to be connected. Right now I just have it disconnected because the new seat does not have anywhere to plug it into, but perhaps this is causing the issue? Here is a picture of this second harness that I don't know what to do with.

Any guidance you can provide would be greatly appreciated as my car is now overdue for state inspection and it won't pass with this fault error. Thanks for reading!