BMW Z3 1999 Under Seat Wiring Completely Cut

BeefyBoi

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Feb 14, 2026
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I have recently purchased a BMW Z3 1999 1.9L, and unfortunately the airbag light is on. I have used the B800 reset tool to scan the car and get code 6 on table 2 (passenger side seat belt pretensioner circuit fired). I lifted up the seat to find the entire wiring harness coming up from the floor had been cut and each wire individually taped back together. Additionally the seat belt pretensioner wiring has been cut to remove the plug. I have matched every wire back up however I have 1 left, a white wire with blue stripe. I have tried rewiring the belt pretensioner however I still have the same fault code. The electric motor and heated seat still work, it is just the pretensioner that appears to have the issue, although I know these work on a delicate resistance.

I have attached a couple of photos that hopefully show my predicament. I have access to some wiring diagrams however wiring is not something I enjoy.
 

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