How Seatbelt Pre-tensioners Works | Operation, Diagnostic & Deployment

🎯 In this video I explain how seatbelt pre-tensioners work. I show you three different types of pretensioners, I dismantle them to explain how they work and what the cautions are when we test or repair them. then I explain how to diagnose and repair the pretensioner and finally at the end of the video I deploy a pretensioner to show you what will happen during seatbelt deployment.