Quote:
Originally Posted by Cartman
most rear seat belts that dont have a pyrotechnic pre-tensioner will use some sort of mechanical stop. there is no electrical connection of any kind to the rear seat belts of the PT, so ther isnt any way for the belts to tell if the car is moving, that dealer needs his head examined. i believe if you buckle yourself in, then test them, a sudden jerk should lock them. as far as i know, the belts have to be out a certain amount for the lock mechanism to operate correctly.
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You don't need an electrical sensor to tell you the car is moving. You can use a mechanical device that will activate only when under deceleration. I believe they use a large ball bearing that blocks the locking mech when it's at the bottom, then when you decelerate, the ball slams forward out of the way and allows the mech to lock. I had a Sentra that had a seatbelt mech like that.