Isn't the folding part associated with the seat base? (I don't have a TJ but on a YJ is it). The base can be separated from the seat with 4 bolts on the underside of the seat and 4 on the floor. Really though, it's a simple system, I think on the TJ's there is a wire that pulls the lever which can break. I'm not 100% but I'd take a look under the seat.