Just had another thought.
In the Ford systems, do the seat belt pre tensioners trigger off the frontal crash sensor or do they have their own sensor?
The reason I bring this up is because if the frontal crash sensor was defective (as suggested by the lack of airbag deployment) and the pre tensioners trigger off that sensor in a frontal crash, then the pre tensioners would not have functioned either. That would also go some way to explaining the significant injury the occupant sustained.
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