Back frame lockout activated via cushion

A latching mechanism for use with a seat assembly having a separately movable seat cushion and seat back, the latching mechanism including a base member, a sector support for supporting the seat back and a lever. The sector support is pivotally coupled to the base member and includes an engagement surface. The lever is pivotably coupled to the base member, and includes a stop. As the seat cushion is moved to a seat forming position, the seat cushion will actuate the lever, the lever placing the stop into contact with the engagement surface and preventing the movement of the seat back.