Update:
More work to do. Went over to pick my wife up at work and was happy not o see airbag guy on my cluster. She gets in the car and buckles up….airbag guy immediately comes back.

I’ll see what the codes are tomorrow, but it seems too coincidental that the tensioner would fail while I’m working on the occupancy issues. I probably need to dig into some wiring diagrams and see where these things intersect. Hopefully there will be some meaningful codes.

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2026 G80 M3 6 spd
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee