It becomes necessary to check and fix the seat belt system after any collision occurs. A seat belt replacement must be conducted when severe impact has occurred on the outer belt, inner belt and bolts, nuts, still bar regardless of whether exterior damage is visible. Perform an inspection system diagnostic followed by visual examination of the quarter trim panel for cuts and cracks as well as marked discoloration. At the same time inspect wire harness cuts and cracks along with connector damage before assessing for quarter panel deformation. A diagnostic system check must be performed first and then inspect the quarter panel for deformities along with the connector and wire harness damage assessment in situations where pretensioners trigger. The pretensioner must be replaced in all these cases: when it activates, during trouble-shooting reveals a fault or when the front outer seat belt fails previous checks or if the front belt drops to the floor. Adhere to the approved steps when uninstalling and installing the seat belt pretensioner unit.