The function of the main airbag in a car
The main airbag of a car is mainly used to protect the driver's head and chest from injury in the event of a vehicle collision. When the sensor detects a collision, the gas generator will quickly inflate to form an air bag covering the center of the steering wheel, buffering the impact force of the occupants' forward rush due to inertia and preventing their heads from hitting the steering wheel or the instrument panel.
Specific mechanism of action
Youdaoplaceholder0 Collision buffer : In the event of a frontal collision, the main airbag rapidly expands through nitrogen filling, absorbing approximately 30% of the collision energy and reducing direct contact between the occupants and hard objects inside the vehicle.
Youdaoplaceholder0 Direction protection : Especially to prevent the driver's chest from hitting the steering wheel, avoiding rib fractures or internal organ injuries.
Youdaoplaceholder0 sensor linkage : Linkage with vehicle sensors to complete inflation within a millisecond response time, achieving precise protection.
Precautions
Avoid manually slapping or hitting the airbag components. During daily inspections, observe whether the airbag indicator light is abnormal (not lit under normal conditions)
When repairing, the airbag assembly must be replaced as a whole. Do not use after repair
The practice of directly eliminating the main airbag fault light of a car by adding a resistor is not recommended, as this may mask potential safety hazards and threaten the safety of drivers and passengers. The correct approach is to use resistors for fault diagnosis and then fix the root cause of the problem, rather than permanently shielding the fault light.
The risks and reasons for not recommending the resistance connection method
Adding resistors directly to the main airbag circuit to eliminate fault lights is a dangerous operation. The main reasons include:
Youdaoplaceholder0 Safety hazard : The resistance connection method bypasses the fault detection mechanism of the airbag system, making it impossible for the system to identify real problems (such as loose wiring harness, airbag damage or computer failure), resulting in the airbag not being able to deploy normally in case of an accident, seriously threatening life safety.
Youdaoplaceholder0 ineffectiveness : This method can only temporarily shield the faulty light and cannot solve the root cause of the problem. For instance, issues such as poor contact of the plug or damage to the airbag hairspring still require professional repair; otherwise, the fault light will repeatedly come on.
Youdaoplaceholder0 authorities oppose : Multiple authoritative auto repair platforms (such as Autohome and Pacific Auto) explicitly oppose this practice, emphasizing that it violates safety regulations.
Safe alternative method: Resistance is used for diagnosis rather than elimination
The resistance connection method is only used as a diagnostic tool in professional maintenance to quickly locate the fault point, rather than permanently eliminate the faulty light. The operation steps are as follows:
Youdaoplaceholder0 fault diagnosis :
Use the OBD-II scanner to read the fault code and determine the specific problem (such as the open circuit fault of B1326).
If the fault code indicates that the resistance of the main airbag is too high, remove the airbag plug and connect a 15-ohm alternative resistor (simulating the airbag load).
Youdaoplaceholder0 verify the fault range :
Clear the fault code after connecting the alternative resistor:
If the fault light goes out, it indicates that the main airbag itself is damaged and needs to be replaced.
If the fault light remains on, the problem lies in the wiring harness, plug or airbag computer (such as poor contact in the hairspring section).
Youdaoplaceholder0 fix the root cause :
Youdaoplaceholder0 Wiring harness/plug issue : Clean the dust off the plug, fix the pins or replace the wiring harness.
Youdaoplaceholder0 airbag damage : Replace the corresponding airbag assembly.
Youdaoplaceholder0 Computer or hairspring failure : Repair or replace the airbag control module/hairspring.
Precautions for Operation
Youdaoplaceholder0 Professional operation : diagnosis should be carried out when the vehicle is powered off to avoid accidental triggering of airbags; It is recommended to be carried out by professional maintenance personnel to ensure safety.
Youdaoplaceholder0 Resistor specification : If a resistor must be used, the standard value of 15 ohms should be selected, and ensure a firm connection to avoid poor contact.
Youdaoplaceholder0 Prioritize troubleshooting common fault points : Approximately 70% of the airbag lights coming on originate from loose connections of the wiring harness plug or damage to the airbag hairspring. Prioritizing the inspection of these areas can efficiently solve the problem.
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