AIR BAG SYSTEM

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Outline

•  During a collision, the air bag system operates (deploys) the air bag to assist the occupant protection function for the seat belt.
Warning
•  The air bag system assists the occupant protection function for the seat belt, the intended effect of the SRS air bag system cannot be obtained if the seat belt is not fastened correctly. When driving the vehicle, always fasten the seat belt correctly.

Function

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

×: Collision detection
××: Operation (deployment)
—: No detection

Collision area

Sensor

Operation (deployment) part

SAS control module (integrated sensor)

Crash zone sensor

Side air bag sensor*1, *2 (driver/passenger-side)

Driver-side air bag module

Passenger-side air bag module

Curtain air bag module*1 (driver/passenger-side)

Side air bag module*2 (driver/passenger-side)

Pre-tensioner seat belt (driver/passenger-side)
Vehicle is involved in frontal or frontal offset collision
×
—
—
—
—
—
—
—
—
×
—
—
—
—
—
—
×
×
—
××
××
××*3, *4
××*3, *4
××
Vehicle is involved in side impact collision
×
—
—
—
—
—
—
—
—
—
×
—
—
—
—
—
×
—
×
—
—
××*4
××*4
××
Vehicle is involved in rear impact collision
×
—
—
—
—
—
—
—

*1  :With curtain air bag module
*2  :With side air bag module
*3  :Operates (deploys) by degree of impact during collision.
*4  :Operates (deploys) on the side the collision is detected.

System conditions display function

•  The air bag system detects each part condition and sends a system condition signal from the SAS control module to the instrument cluster.
•  The instrument cluster displays the following warning lights and sounds 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 LIGHT.)
Passenger air bag deactivation (PAD) indicator
(See PASSENGER AIR BAG DEACTIVATION (PAD) SYSTEM.)


Structural View

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System Wiring Diagram

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Operation


Vehicle is involved in frontal or frontal offset collision

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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Vehicle is involved in side impact collision (With side air bag)

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.

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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