What is a secondary airbag in a car
The front airbag of a car is an airbag installed on the front passenger seat and is an important part of the car's passive safety system. It is used to protect the safety of the front passenger in the event of a collision.
Core function
The secondary airbag rapidly inflates through a gas generator to form a cushioning pad, reducing the collision between the occupant and the interior components due to inertial impact, mainly protecting the head and chest.
Installation location
It is usually located inside the platform directly in front of the passenger seat. In some models, it is installed in the area above the glove compartment.
Trigger mechanism
When the vehicle's collision acceleration exceeds the preset threshold, the gas generator (containing chemicals such as sodium azide) instantly releases gas to fill the airbag.
The front passenger airbag (passenger side airbag) is installed inside the central control platform directly in front of the passenger seat. Its main function is to rapidly inflate in the event of a frontal collision, forming an air cushion to cushion the inertial impact force of the occupant's forward dive, thereby reducing the risk of head and chest injuries.
Specific functions
Youdaoplaceholder0 Buffering inertial impact : At the moment of collision, the gas expands to form an air cushion, isolating the passenger seat from the hard structure of the vehicle body, preventing passengers from directly hitting the center console or windshield due to inertia.
Youdaoplaceholder0 Prevent secondary collisions : Reduce the contact between occupants and interior components (such as the center console panel, seat belt buckles, etc.) to lower the degree of injury.
Location and Structure
It is usually located in the area above the glove compartment directly in front of the passenger seat and works in coordination with the driver's airbag to jointly protect the occupants inside the vehicle.
The warning light of the secondary airbag in a car may come on for various reasons. The following are common causes and their corresponding solutions:
Poor contact of the plug
The plug of the front passenger side airbag circuit may have poor contact due to dust accumulation, loosening or oxidation. You can try cleaning the metal terminals by yourself and reincarnating them tightly. In most cases, this can solve the problem temporarily.
False alarm or malfunction of the sensor
The collision sensor may misjudge the impact force due to unstable voltage, short circuit or design flaws, causing the fault light to come on. If the front passenger still shows "Airbag activated" when no one is in the passenger seat for a long time, it may be that the sensor misjudges the presence of a passenger.
Abnormality of the control module
The passenger side airbag control module (ACU) may cause system failure due to internal solder joint delamination or programming errors. Professional equipment is required to read the fault code (such as B1 017, B1029) and match for maintenance.
Insufficient battery voltage
When the battery voltage is lower than 12V, the airbag system may mistakenly report a fault code. It can be restored after charging or replacing the battery.
Self-disassembly and repair are prohibited
Do not disassemble or assemble the steering wheel or the front passenger seat components by yourself. The airbag system contains a high-voltage ignition device. Improper operation may cause an accidental explosion.
It is recommended to have it inspected at a regular repair point first. If an accident is involved, on-site photos should be kept for traceability and claim settlement.
If the secondary airbag of a car is damaged, it needs to be repaired immediately. The specific handling methods are as follows:
Troubleshooting steps
Youdaoplaceholder0 check the plug connection
The malfunction of the passenger side airbag may be caused by a loose or oxidized plug under the seat. You can try unplugging and cleaning the metal terminals.
Youdaoplaceholder0 read the fault code
Using a diagnostic tool to read specific fault codes (such as B1029 indicating abnormal resistance of the driver's side airbag) can quickly locate the faulty component.
Precautions
Do not disassemble or assemble the steering wheel or the front passenger seat by yourself to avoid triggering safety hazards.
When the fault light remains on constantly, do not continue driving. Immediate inspection and repair are required; otherwise, it may cause the airbag to fail to deploy in the accident.
It is recommended to contact a professional maintenance institution for inspection and ask for photos of the fault code and maintenance videos to avoid being overquoted.
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