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.

Detection signal

Sensor

Operation (deployment) part

SAS control module (integrated sensor)

Crash zone sensor

Side air bag sensor (driver/passenger-side)

Driver-side air bag module

Passenger-side air bag module

Curtain air bag module (driver/passenger-side)

Side air bag module (driver/passenger-side)

Pre-tensioner seat belt (driver/passenger-side)
Detects frontal or frontal offset collision
×
×
-
×
×
-
-
×
Detects lateral collision
×
-
×
-
-
×*
×*
×
Detects collision from rear of vehicle
×
-
-
-
-
-
-
-

*  :Operates (deploys) the air bag module on the side where 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 system warning light
(See AIR BAG 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.)
Passenger air bag deactivation (PAD) indicator
(See PASSENGER AIR BAG DEACTIVATION (PAD) SYSTEM.)


Structural View

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System Wiring Diagram

TYPE A

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TYPE B

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Operation


Operation (deployment) during a frontal or frontal offset collision

1.  When the vehicle receives an impact from a frontal or frontal offset collision, the crash sensors built into the crash zone sensor, and the SAS control module detect the impact and convert the impact into an electrical signal at the signal processing circuit.

2.  The crash zone sensor outputs the electrical signal to the SAS control module.

3.  The SAS control module calculates the degree of impact at the determination and safing circuit based on the electrical signals from the crash zone sensor and the crash sensor.

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

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

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Operation (deployment) during a lateral collision

1.  When the vehicle receives an impact from a lateral collision, the crash sensors built into the side air bag sensor, and the SAS control module detect the impact and convert the impact into an electrical signal at the signal processing circuit.

2.  The side air bag sensor outputs the electrical signal to the SAS control module.

3.  The SAS control module calculates the degree of impact at the determination and safing circuit based on the electrical signals from the side air bag sensor and the crash sensor.

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

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

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