System Outline

The SRS (Supplemental Restraint System) is a driver protection device which has a supplemental role to the seat belts.

When the Ignition SW is turned to ACC or ON, current from the CIG fuse flows to TERMINAL 8 of the airbag sensor assembly. Only when the Ignition SW is ON does the current from the IGN fuse flow to TERMINAL 7 of the airbag sensor assembly.

If an accident occurs while driving, deceleration caused by a frontal impact is detected (By Sensor) and when the frontal impact exceeds a set level, current from the COG or IGN fuse flows to TERMINAL 2 of the airbag sensor assembly --> TERMINAL 1 of the airbag squib (Steering Wheel Pad) --> Squib --> TERMINAL 2 --> TERMINAL 1 of the airbag sensor assembly --> TERMINAL 3 --> Ground.

When the safing sensor built into the airbag sensor assembly is ON, airbag sensor is OFF and current from the CIG or IGN fuse flows to TERMINAL 2of the airbag sensor assembly --> TERMINAL 1 of the airbag squib (Steering Wheel Pad) --> squib --> TERMINAL 2 --> TERMINAL 1 of the airbag sensor assembly --> TERMINAL 3 --> Ground. When the safing sensor built into the airbag sensor assembly is ON, the airbag sensor on one of the above-mentioned circuits is activated so that current flows to the airbag squib and causes it to operate.
The airbag stored inside the steering wheel pad is instantaneously expanded to soften the shock to the driver.