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Are you sure something fell into the buckle? Mine would intermittently not latch on to the belt and it would take several attempts to catch. In the end, I bought an extender and buckled that in instead.
Also, in replacing, they are side specific. GGG's admonishment is true, but I read elsewhere, the (can't remember correct ter) "tear away" pressure portion is different in each side.
Oh and yes, if you watch the videos I posted, it seems they have no problem clipping the buckle into the passenger side. It's just stuck failure, something inside failure, or broken components inside failure.
I certainly believe electronics are inside. How else would buckling it, turn the seat belt light off. Just pulling the strap doesn't extinguish it, lol.