TSB: FRONT PASSENGER OCS SENSOR MAT DIAGNOSIS AND REPLACEMENT - THIS BULLETIN PROVIDES INFORMATION RELATED TO THE REPLACEMENT OF THE FRONT PASSENGER OCCUPANT CLASSIFICATION SYSTEM (OCS) SENSOR MAT IN 2008~2011MY RIO (JB) VEHICLES. IF THE SENSOR MAT IS NOT WORKING PROPERLY, THE AIRBAG WARNING LIGHT ON THE CLUSTER WILL ILLUMINATE AND DTC(S) B1447, B1448, B1449 AND/OR B1450 MAY BE STORED. IF THE AIRBAG WARNING LIGHT IS ILLUMINATED AND ONE OR MORE OF THE ABOVE DTCS ARE STORED, FOLLOW THE REPAIR PROCEDURE OUTLINED IN THIS BULLETIN TO REPLACE THE OCS MAT.