Pic. 1.118. Block diagram of the seat belt warning system
If the seat belt is not fastened, the warning lamp flashes and the buzzer sounds.
The seat belt warning system is standard.
After starting the engine, the system determines the state of the seat belts using signals from sensors in the buckles (driver and front passenger seat belts) and seat occupancy sensors.
If the speed exceeds 15 km, the buzzer sounds, drawing the attention of the driver and passenger to the unfastened seat belts. After 30 seconds, the sound changes. This sound lasts for about 90 seconds. Once activated, the buzzer will continue to sound until the seat belts are fastened or the engine is turned off.
Pic. 1.119. Passenger seat sensor
Passenger seat sensor
An occupancy sensor installed in the front passenger seat cushion detects whether a passenger is present in the front seat.
The sensor, the design of which is shown in the figure, consists of two plate electrodes with a gasket. If a passenger sits on the seat, the electrodes are shorted through a hole in the gasket, causing an electrical current to flow through the circuit.
Thus, the sensor allows you to determine the presence of a passenger in the front seat.