Seat Belt Tensioner: Description and Operation

As part of the Supplemental Restraint System (SRS), the safety belt retractors are equipped with pretensioners. The belt retractor pretensioners rotate the safety belt retractors to remove excess slack from the safety belt webbing. The pretensioners are activated by the Restraints Control Module (RCM) when the module detects a frontal impact force exceeding a programmed limit.