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Q: How do the seat belt pretensioners work?

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How do the seat belt pretensioners work?

The job of the pretensioner is to allow the seat belt to work correctly when restraining someone. The pretensioner retracts to keep the person in place if an accident should happen. The emergency locking retractor or ELR works when the car makes a sudden stop or if it impacts with a solid object. An automatic locking retractor or ALR holds the person if one position once the belt has been extended fully and retracted.

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