Maybe the spring is jammed:

"Seat Belt Latch Red Button Replacement. [Larry Dennis] This red button in the latch deteriorates in the sun and can break. An easy fix is to find one from a car that has seen less sun, usually from the back seat belt latches. The button will pop off easily with a pocket knife under the tab on the side of the red button. Be carefull not to drop anything down in there. There is a spring that sits in a hole under the red button which usually stays in place while removing the red button. Just pop the new one in place. Just make sure the belt latch operates properly before someone uses it. "
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Post Back. That's whats makes this forum work.