Airbag Deployment Sequence

Fig 1: Locating Electrical Connection At Airbag

Courtesy of DAIMLERCHRYSLER CORP.

When the actuation impact threshold for the driver side airbag is exceeded, an electric pulse is transmitted to the squib in the gas generator by the Seat Belt Tensioner (SBT) and Occupant Restraint Controller (ORC).
The squib ignites the solid fuel in the gas generator. The solid fuel combusts, developing a gas which explodes under high pressure into the airbag through a filter.

Fig 2: Identifying Airbag Inflation
Courtesy of DAIMLERCHRYSLER CORP.
The airbag inflates and tears open the steering wheel cushion cover at a predetermined breaking point.

Fig 3: Identifying Airbag Exiting Steering Wheel Cushion
Courtesy of DAIMLERCHRYSLER CORP.
While continuously inflating, the airbag begins to exit the steering wheel cushion.

Fig 4: Identifying Airbag Maximum Volume
Courtesy of DAIMLERCHRYSLER CORP.
After approximately 45 ms. the airbag reaches its maximum volume.
When the maximum volume is reached, the pressure in the airbag starts decreasing immediately. The gas escapes from the airbag through a filter and the airbag deflates.