Ignition Judgement And Conditions

a. Operation in case of front collision.

1. When the vehicle collides in the hatched area (Fig. 29) and shock is larger than a predetermined level, the airbags (driver and front passenger) are activated automatically. The deceleration sensor of the center airbag sensor assembly determines the need for ignition in response to collisions within the hatched area based on the signal from the deceleration sensor of the front airbag sensor.

2. Safing sensor of the center airbag sensor assembly is designed to activate at by a smaller deceleration rate than the deceleration sensor. As illustrated in Fig. 29 below, when both the safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.

2007 RESTRAINTS Supplemental Restraint System - Sequoia

Fig. 29: Center Airbag Sensor Assembly Cummunication Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. with Side and curtain shield airbag:

Operation in case of front side collision Electronic safing sensor of the center airbag sensor assembly is designed to activate at a smaller deceleration rate than the deceleration sensor of the side airbag sensor. As illustrated below, when both the electronic safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.

Center Airbag Sensor Assembly

Center Airbag Sensor Assembly

Fig. 30: Center Airbag Sensor Assembly Cummunication Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. with Side and curtain shield airbag:

Operation in case of rear side collision. Electronic safing sensor of the center airbag sensor assembly is designed to activate at a smaller deceleration rate than the deceleration sensor of the rear airbag sensor. As illustrated below, when both the electronic safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.

2007 RESTRAINTS Supplemental Restraint System - Sequoia

Fig. 31: Center Airbag Sensor Assembly Cummunication Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

d. with Side and curtain shield airbag:

Roll sensing of curtain shield airbag control.

The center airbag sensor assembly contains a roll rate sensor and roll rate sensor (that determine the inclination angle the vehicle) and a lateral deceleration sensor (that determine the lateral force that is applied to the vehicle). These sensors detect the vehicle's roll angle, rotational speed, and lateral acceleration speed.

Based on the information obtained from sensors, the center airbag sensor assembly makes an overall judgment of the vehicle's roll angle rotational speed, and lateral acceleration speed. If the airbag sensor determines that the vehicle has rolled over due to cause other than the side collision, it deploys the right and left curtain shield airbags and the front right and left seat belt pretensioners.

This system provides a roll sensing of curtain shield airbags cutoff switch (RSCA OFF switch) on the driver side of the instrument panel with which the driver can stop the operation of the function.

By operating the RSCA OFF switch and while the roll sensing of the curtain shield airbag control is OFF, and when the center airbag sensor assembly judges to operate the side and curtain shield airbag system in the event of side collision, it is no need prohibit this operation.

2007 RESTRAINTS Supplemental Restraint System - Sequoia

Fig. 32: Slide Collision And Rollover Detection Working Chart Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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