Here is what various seat belt pretensioners looks like:

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Seat Belt Pretensioners Types:

A pretensioner is a device that is connected to the safety belt buckle, safety belt retractor or/and and outboard lower safety belt anchor assembly. The pretesioner tightens the seat belt during certain crashes. Pretensioners may deploy with or without airbag deployment. Depending upon the vehicle, pretensioners may activate in certain frontal, side, rear and/or rollover crashes. For some vehicles pretensioners will deploy if the safety belt is buckled.

Buckle 

The buckle pretensioner uses a pyrotechnic gas generator to proper a piston that is attached to the safety belt buckle with a cable. The cable pulls the buckle down toward the seat tightening the belt.

Anchor 

The anchor pretensioner uses a pyrotechnic gas generator to propel a piston that is attached to the outboard lower safety belt anchor assembly with a cable. The cable pulls the anchor assembly down toward the floor tightening the belt.

Retractor 

The retractor pretensioner uses a pyrotechnic device that “backwinds” the retractor spool tightening the belt. Use the same precautions you would for the other SRS inflatable restraint components. There may be power to activate a pretensioner for a short time after the battery is disconnected or the ignition is turned off.

There are 3 types of retractor pretensioners

• Single Stage (1-Stage) has 1 plug connector
• Dual Stage   (2-Stage) has 2 plugs connectors
• Triple Stage (3-Stage) has 3 plugs connectors

1 Stage

2 Stage (Dual Stage)

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