Seat Belt Pretensioner
A seat belt pretensioner pulls the belt tight in the first moments of a crash so the occupant is held firmly in the seat.
What is Seat Belt Pretensioner?
Most pretensioners use a small pyrotechnic charge at the buckle or the retractor; some cars also have reversible electric pretensioners. Load limiters let the belt give a little after the pretensioner fires to reduce chest forces. Pretensioners are controlled by the same module as the airbags.
How it works
When a crash is detected, the charge fires and pulls the belt back by several centimetres within milliseconds.
Why it matters for your car
A pretensioner that has fired must be replaced, along with the belt in most cases. A faulty pretensioner circuit sets an SRS warning.
Other terms
- Bluetooth Hands-free System
- Charge Air Pipe (Boost Hose)
- Connector Corrosion
- Curtain Airbag (Head Airbag)
- Drive-by-wire (Electronic Throttle)
- Driving In Hot Weather
- Engine Valve
- Frost Warning (Ice Warning)
- Induction Motor (Asynchronous Motor)
- OBD-II
- Power Steering
- Quick Detailer
- Reverse Gear
- Soft-close Doors
- Tube-Type Tyre (Inner Tube)
- Usable Battery Capacity (Net Capacity)
- Vehicle Category (M1, N1)
- Warning Triangle
- Wheel Stud And Wheel Bolt
- Windscreen (Windshield)