What is a car front seat belt
The front seat belt of a car is a key safety device in a vehicle used to restrain occupants and prevent secondary injuries in the event of a collision . It is usually located in the front seats and is divided into two types: three-point seat belts and pre-tensioning seat belts.
Core function
Collision protection: By fixing the occupant's body, it reduces the risk of secondary collisions with hard objects inside the vehicle (such as the steering wheel and dashboard), lowering the mortality rate by approximately 57% to 80%.
Preventing being thrown out of the vehicle: In high-speed collisions, seat belts can effectively restrict the movement of occupants and prevent them from being thrown out of the vehicle.
Main types
Three-point seat belt
Structure: The shoulder strap is connected to the waist belt, forming a "V" -shaped fixed point.
Adjustment method: The height of the shoulder fixing point can be adjusted in three levels. It is necessary to ensure that the strap is located in the center of the chest and above the shoulder.
Pre-tensioning seat belt
Pre-tensioning device: Instantly tightens upon collision to eliminate the remaining loose seat belt and prevent passengers from slipping off.
Tension limiter: Automatically relaxes after peak impact, reducing continuous pressure on the body.
Usage Specifications
Correct wearing: The shoulder straps should span the chest cavity, and the waist belt should fit the hips to avoid twisting or pressing on hard objects.
Prohibited behavior: It is strictly forbidden for two people to share the seat. When no one is on the seat, the seat belt must be retracted to prevent the tongue from being hit.
Security data
Improved survival rate: Standardized use can increase the survival rate in fatal accidents by 60%.
Combined with airbags: Working in synergy with safety airbags, it can reduce the risk of injury and death by 44% to 80%.
The main function of the front seat belt in a car is to protect the safety of the driver and passengers, reduce the impact force in a collision and prevent secondary injuries . The following are the specific functions:
Collision protection
When a vehicle is involved in a collision, seat belts restrain the body, reducing the risk of secondary collisions or being thrown out of the vehicle due to inertia, and significantly lowering the casualty rate.
Used in conjunction with airbags
Seat belts and airbags work in coordination to more effectively disperse impact forces and enhance the overall protection effect.
Driving posture assistance
Although seat belts cannot actively adjust driving postures, wearing them correctly can assist in securing the body and indirectly help maintain a reasonable sitting posture.
Habitual use
Forming the habit of fastening the seat belt as soon as you get into the car is a fundamental measure to ensure driving safety.
It is indeed worrying to encounter a malfunction of the seat belt. A malfunction of the front seat belt in a car may be caused by problems with the safety module, sensor, retractor or circuit , and it needs to be checked and dealt with in a timely manner.
Common causes of faults
Safety module failure: The seat belt is associated with the airbag module. Module damage can cause abnormal circuits.
Sensor issue: Passenger perception sensor failure may cause instrument alarms or seat belt failure.
Abnormal retractor: Insufficient welding of the pretensioner may cause the seat belt to fail to retract or accidentally explode (such as in the Lincoln Navigator recall case).
Circuit corrosion: Moisture or contamination of printed circuit boards may cause short circuits (such as in the recall of some BMW models).
Diagnosis and treatment methods
Youdaoplaceholder0 Basic check
Check if the lock contact is open circuit and try to clear the foreign object or tap the rewinder.
Use the emergency unlock hole to release the stuck seat belt.
Youdaoplaceholder0 professional inspection
Read the fault code through the diagnostic instrument to locate the problem of the airbag module or sensor.
Measure the voltage of the seat belt switch to determine if it is damaged.
Youdaoplaceholder0 repair suggestions
If the recalled models are involved (such as the 2018-2020 Lincoln Navigator and some BMW models), you need to contact the 4S store for free replacement of parts.
For non-recalled vehicles, it is recommended that professional technicians replace the rewinder or circuit board.
Safety Tips
Avoid using seat belts during malfunctions and give priority to other safety measures.
Regularly clean the seat belt to prevent corrosion by chemical cleaners.
Safety is no small matter. May your and your family's travels always be properly protected.
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