Navistar is recalling certain model year 2014-2015 IC Bus CE and model year 2014 IC Bus RE transit buses manufactured August 12, 2013, through November 14, 2013 and equipped with IMMI-brand L9 seat belt buckles. When the button is pressed to release the seat belt, the latch plate can become partially engaged with the buckle, making the seat belt difficult to unlatch. Thus, these vehicles fail to conform to the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 209, “Seat Belt Assemblies.”