Toyota Vios 2022 Steering Wheel Airbag: Safety and Functionality

The Toyota Vios 2022 steering wheel airbag (part number 451300D390) is a critical safety component designed to mitigate driver injury in a collision. Modern vehicles incorporate multiple airbags for comprehensive passenger protection, extending beyond the steering wheel.

Airbags are single-use safety devices. Once deployed, they are irreversibly damaged. The primary airbag, located on the steering wheel above the horn, works in conjunction with a sensor and horn cable situated beneath it. This sensor communicates with the Airbag Control Unit (ACU), the system’s central control. The ACU determines when to deploy the airbags.

Early airbag designs relied on compressed air, but this proved inadequate. Current systems utilize a propellant charge – a precisely controlled chemical reaction – to rapidly inflate the airbag. This reaction, involving a blend of flammable materials, generates a substantial volume of gas in a fraction of a second. The system is self-contained and integrated into the airbag assembly.

The critical role of the driver’s airbag in accident prevention is undeniable. Consider a 60 km/h collision: the vehicle stops abruptly, but occupants continue moving forward due to inertia. The airbag significantly reduces the impact force. Upon sensing a collision exceeding a predefined threshold, onboard sensors signal the ACU. The ACU then triggers the propellant, inflating the airbag within just 0.04 seconds. This rapid inflation and subsequent deflation through vents minimizes impact and ensures driver visibility and egress.

Vehicle Compatibility

• Toyota Vios 2015-2022
• Toyota Yaris 2015-2022

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