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I recently swapped in sport seats myself and had the same issue with airbag light. My seatbelt light also came on at the same time. My theory is that even though I disconnected the battery before swapping seats, it may be possible I didn't let the car sit long enough before unplugging the seats. Maybe there was enough charge left in the electrical system for it to register the broken circuit.
I picked up a $50ish diagnostic tool for BMWs off of Amazon and was able to clear the code. It's been a couple hundred miles and so far no light.
Both the seats I took out and the ones I put in are manual and don't have the seat module that yours do. I don't know if the more advanced modules need any further coding.
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