AIR BAG SYSTEM [TWO-STEP DEPLOYMENT CONTROL SYSTEM]

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Outline

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

Driver-side air bag deployment force switching function (two-step deployment)

•  The driver-side air bag deployment force switching function switches the driver-side air bag deployment force by deploying inflators No.1 and 2 built into the driver-side air bag module simultaneously or only inflator No.1 according to the degree of impact from a frontal or frontal offset collision, the slide position of the driver's seat, and the front seat belt fastening status.

Collision impact	Front and back positions of driver's seat	Front seat belt status	Driver-side air bag module		Air bag deployment force
			Inflator No.1	Inflator No.2
Small	Position other than foremost position	Equipped	Deployment	—	Small
Large			Deployment	Deployment	Large
Small		Not equipped	Deployment	Deployment	Large
Large			Deployment	Deployment	Large
Small	Foremost position	Equipped	Deployment	—	Small
Large			Deployment	—	Small
Small		Not equipped	Deployment	—	Small
Large			Deployment	—	Small

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 [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
Air bag system warning alarm	(See AIR BAG SYSTEM WARNING ALARM [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
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 (1) from a lateral collision is received, the following sensors (2) detect the impact and convert the impact or the pressure into an electrical signal at the signal processing circuit (3).

―  Crash sensor integrated into side air bag sensor

―  Crash sensor integrated into SAS control module

―  Pressure detection sensor integrated into pressure sensor

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 or the pressure detection 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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