Description And Operation: PRETENSIONERS
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| ITEM | DESCRIPTION |
|---|---|
| 1 | Electrical connector |
| 2 | Pyrotechnic pretensioner |
| 3 | Safety belt buckle |
The pretensioners are used to tighten the front safety belts during a collision to ensure the occupants are securely held in their seats. A pretensioner is integrated into each front safety belt buckle.
Each pretensioner has a tube containing an inflator and a piston. The inflator is connected to the RCM. The piston is attached to a steel cable, the opposite end of which is attached to the safety belt buckle.
On receipt of a fire signal from the RCM, the inflator generates nitrogen gas that rapidly expands to drive the piston along the tube, pulling the cable and drawing the safety belt buckle downwards.