(3) Airbag controller一computer that operates the system and detects faults.
(4) Dash warning lamp一dash bulb that grows with system problem and goes out assystem arms.
An electric airbag system deploys an inflatable nylon bag to help protect the driverduring a collision. It uses impact sensors to detect a severe collision. The sensors feedtheir signals to the airbag controller. When at least two impact sensors are energized, thecontroller activates the airbag module.
The airbag inflates in about 1/20th of a second, well before the driver's body fliesforward from the collision. The tough nylon bag can easily absorb the forward inertia of ahuman body. This helps protect both the driver and the passengers.
All late-model vehicles are equipped with dual airbags：a driver-side airbag and apassenger-side airbag. The driver-side airbag locates in the steering wheel. The passenger-side airbag deploys from the right side of dash. The driver- and passenger-side airbags willonly deploy during frontal impacts. Steering wheel and dash mounted airbags may notdeploy in side impact，rear impact or rollover situation. A collision must occur withinabout 30 degree of the vehicle's centerline for these airbags to inflate，shown in Fig. 10. 2.
Side-impact airbags can be located in the door panels or on the outside edge of eachfront seat. These small airbags deploy when the vehicle is hit from the side. Th(:vgenerally do not deploy during a frontal impact. Side-impact airbags are becoming morecommon and are used by several auto manufactures. When a vehicle is hit from the side,injury usually results when the occupant's shoulder and head fly through the side windowglass. A side-impact airbag system senses the side thrust of the impact and deploys a smallairbag to cushion the person as he or she is propelled sideways.
Fig. 10. 2 shows a distributed sensing system, where multiple sensors are combinedto detect a collision. An electronic control unit（ECU) often monitors the triggering ofmultiple sensors and controls the activation of the airbags.

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