Technical Description

In the event of an accident, proper seat belt use and being seated properly can effectively reduce accident-related injuries being sustained by occupants. To take full advantage of the protective function of the airbag system, the driver and all passengers must put their seat belts on properly, and the driver's seat must be correctly adjusted before every journey. Use suitable child restraint systems to protect any children on board.

The airbag system is up and running as soon as terminal 30 C is supplied with voltage. When the power supply is switched on, the airbag and passenger detection lights both first of all light up for 5 seconds in the touchscreen. The airbag control module carries out a check on all the components in then system. If no faults are detected, the lights go out.

If an error is detected, the symbol on the touchscreen begins to flash. The system must then be checked at an authorized repair shop, and the fault rectified.

The system treats the following situations as faults:

• Indication of a faulty airbag sensor
• Airbag battery out of power
• Defective airbag coil
• Damaged airbag module
• Faulty seat belt latch

Courtesy of VINFAST, LLC

The airbag system consists of 11 separate airbags. The airbag cannot be activated until it has been confirmed that the system is working correctly, and the thresholds of all sensors meet the "must-fire-values". Further influencing variables are the driver and passenger seat belt buckle switches and passenger detection or passenger classification signals.

Throughout the journey, 10 sensors constantly register the acceleration and deceleration values and their direction, and notify the airbag control module (ACM) of these. If the values exceed the specified threshold values, the ACM deploys the airbags.

The system carries out the following actions at the same time:

• Pyrotechnic pretensioners deploy
• High-voltage system is disconnected from the vehicle electrical system
• All doors are unlocked

When deployed, the integrated pyrotechnic elements inflate the airbags within milliseconds. The airbags then cushion the passengers in a way that prevents them from being injured by colliding with parts of the vehicle's interior. After ignition, the airbags deflate again so quickly that passengers cannot register the full size of the airbags.

Which of the airbags are activated depends on the direction and intensity of the impact. Additional factors initiating the deployment of airbags might be:

• The seat occupancy detector
• Seat belt buckle detector
• Seat rail position

Schematic Diagram: 

Courtesy of VINFAST, LLC

Operation: (Use Cases) 

Work on the airbag system may only be carried out by qualified experts who hold a "certificate of competence for handling pyrotechnic equipment and materials (airbags)". 

With the exception of the US variant, the vehicle's airbag system has no active controls. With the US variant, you can deactivate the front passenger airbag.