AIR BAG SYSTEM

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Outline

• With the air bag system, the SAS control module operates (deploys) the air bags according to the degree of impact during the collision to supplement the occupant protection function of the seat belts.

Warning

• The air bag system supplements the occupant protection function of the seat belts, however the intended effect of the air bag system cannot be obtained if the seat belts are not fastened correctly. When driving the vehicle, always fasten the seat belts correctly.

Function

• With the air bag system, the SAS control module calculates the degree of impact based on the collision detection signal from each of the following sensors, and operates (deploys) the required parts.

×: Collision detection

××: Operation (deployment)

—: No detection

Collision area	Sensor			Operation (deployment) part
Collision area	Crash sensor integrated into SAS control module	Crash sensor integrated into crash zone sensor	Crash sensor integrated into side air bag sensor	Driver-side air bag module	Passenger-side air bag module	Curtain air bag module (driver-side/passenger-side)	Side air bag module (driver-side/passenger-side)	Front pre-tensioner seat belt (driver-side/passenger-side)	Rear pre-tensioner seat belt (driver-side/passenger-side) ^*1
Collision from front of vehicle or frontal offset	×	—	—	—	—	—	—	—	—
	—	×	—	—	—	—	—	—	—
	×	×	—	××	××	××^{2, 3}	××^{2, 3}	××	××
Collision from side of vehicle	×	—	—	—	—	—	—	—	—
	—	—	×	—	—	—	—	—	—
	×	—	×	—	—	××^*3	××^*3	××	××
Collision from rear of vehicle	×	—	—	—	—	—	—	—	—

With roll rate sensor

Collision area	Sensor		Operation (deployment) part
Collision area	Roll rate sensor integrated into SAS control module	Low-G sensor integrated into SAS control module	Driver-side air bag module	Passenger-side air bag module	Curtain air bag module (driver-side/passenger-side)	Side air bag module (driver-side/passenger-side)	Front pre-tensioner seat belt (driver-side/passenger-side)
Vehicle is involved in rollover collision	×	—	—	—	—	—	—
	—	×	—	—	—	—	—
	×	×	—	—	××	—	××

*1 :Australian specs.

*2 :Operates (deploys) by degree of impact during collision.

*3 :Operates (deploys) on the side the collision is detected.

System conditions display function

• The air bag system detects each part condition and the SAS control module sends the system status signal to the instrument cluster.

• The instrument cluster notifies the user of the system conditions using the following warning light or alarm based on the system condition signal.

Warning light and alarm

Reference

Air bag/seat belt pre-tensioner system warning light

(See AIR BAG/SEAT BELT PRE-TENSIONER SYSTEM WARNING LIGHT.)

Air bag system warning alarm

(See AIR BAG SYSTEM WARNING ALARM.)

Seat belt warning light

(See SEAT BELT WARNING ALARM.)

(See INDICATOR UNIT.)

Warning light and alarm	Reference
Air bag/seat belt pre-tensioner system warning light	(See AIR BAG/SEAT BELT PRE-TENSIONER SYSTEM WARNING LIGHT.)
Air bag system warning alarm	(See AIR BAG SYSTEM WARNING ALARM.)
Seat belt warning light	(See SEAT BELT WARNING ALARM.) (See INDICATOR UNIT.)

Structure/Construction

Structural view

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System wiring diagram

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Operation

Collision from front of vehicle or frontal offset

1. When an impact from a frontal or frontal offset collision (1) is received, the crash sensor built into the crash zone sensor and the crash sensor (2) built into the SAS control module detect the impact and convert the impact into an electrical signal at the signal processing circuit (3).

2. The SAS control module calculates (6) the degree of impact using the determination and safing circuit (5) based on the electric signal (4) from each crash sensor.

3. If the calculated degree of impact exceeds the previously set threshold, the SAS control module outputs (8) an operation (deployment) signal to each air bag module or pre-tensioner seat belt at the output control circuit (7).

4. Each air bag module or pre-tensioner seat belt operates (deploys) (9) based on the operation (deployment) signal from the SAS control module.

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Collision from side of vehicle

1. When an impact from a lateral collision (1) is received, the crash sensor built into the side air bag sensor and the crash sensor (2) built into the SAS control module detect the impact and convert the impact into an electrical signal at the signal processing circuit (3).

2. The SAS control module calculates (6) the degree of impact using the determination and safing circuit (5) based on the electric signal (4) from each crash sensor.

4. Each air bag module or pre-tensioner seat belt operates (deploys) (9) based on the operation (deployment) signal from the SAS control module.

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Vehicle is involved in rollover collision (With roll rate sensor)

1. The following sensors integrated into the SAS control module (1) detect the various movements (2) of the vehicle while it is moving and converts them to electric signals.

― Low-G sensor in the SAS control module detects acceleration of vehicle in longitudinal direction

― Roll rate sensor in the SAS control module detects acceleration of vehicle in roll angle direction

2. The SAS control module calculates (4) the roll value using the determination and safing circuit (3) based on the electric signal from each sensor.

3. If the calculated degree of the roll angle exceeds the previously set threshold, the SAS control module outputs (6) an operation (deployment) signal to the curtain air bag module, pre-tensioner seat belt and lap pre-tensioner seat belt at the output control circuit (5).

4. The curtain air bag module, pre-tensioner seat belts and lap pre-tensioner seat belts operate (deploy) (7) based on the operation (deployment) signal from the SAS control module.

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