Seat Belt Systems: Description and Operation

Schematic






System Description
- Pre-crash seat belt system is adapted to front seat belts RH/LH.
- When the pre-crash seat belt control unit judges the emergency braking operation, it gives the sense of security by the motor built into the pre-crash seat belt retracting the shoulder belt and suppressing the crew's posture change. Also, it eases the damage of the collision.

FUNCTION DESCRIPTION

Operation condition






Operation prohibition condition
If operation condition is satisfied, pre-crash seat belt does not operate under the following conditions.






FAIL-SAFE MODE
When a malfunction occurs in the following system, the pre-crash seat belt function is controlled according to the malfunctioning parts.
Also, seat belt warning lamp blinks with fastening driver seat belt when the following malfunction occurs.






Seat Belt Warning Lamp Illumination Pattern






NOTE: The seat belt warning lamp illumination system shown above operates only when the air bag system does not turn on the seat belt warning lamp. The air bag system turns on the seat belt warning lamp, depending on the conditions of passenger being on and the passenger seat belt fastening.

CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

CAN Communication Unit
Refer to LAN-29, "CAN System Specification Chart". CAN System Specification Chart