Ford Mercury Villager 1997 Owner's Manual page 144

The auxiliary safety retraint system for the second row bench seat
A twisted belt may prevent the retractor from working
properly. If the unique safety belt system is twisted, disengage
the single window tongue from the buckle on the side of the seat,
remove the twist and re-install the tongue into the buckle until
you hear a snap and feel the latch engage.
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