SEAT SUPPORTED AIRBAG

An assembly includes a seat bottom and a seat back extending upwardly from the seat bottom. An airbag is supported by the seat back and is inflatable to an inflated position above the seat. A pyrotechnic actuator is mounted to the seat bottom and is connected to the airbag. When the airbag is inflated to the inflated position, the pyrotechnic actuator pulls the airbag toward the seat bottom.