Lincoln BT4Z-78042D94-A Air Bag Module

The airbag inflator module contains a housing incorporating the cushion (airbag) and inflator unit, mounted in the center of the steering wheel. The inflator assembly is mounted on the back of the housing over a hole through which gas is expelled, inflating the bag almost instantaneously when an electrical signal is sent from the system. A spiral cable assembly on the steering column under the module carries this signal to the module, allowing it to transmit an electrical signal regardless of the steering wheel position.

The Supplemental Restraint System (SRS), more commonly known as airbags, is designed to protect the driver and the front seat passenger from serious injury in the event of a head-on or frontal collision. It consists of an airbag module in the center of the steering wheel and another airbag module on the right side of the instrument panel. Some later models also include side airbags and curtain shield airbags for side impact protection, as well as a sensing/diagnostic module mounted in the center of the vehicle below the instrument panel. Additionally, these models are equipped with a pair of impact sensors located at the front of the vehicle.