Air Bag Control Module: Description and Operation

When the crash sensor in the SAS control module detects vehicle deceleration due to the shock of a collision, it outputs an electric signal and simultaneously, the safing sensor detects this and turns ON.
The output control circuit calculates the input electric signal and determines whether or not to send the signal to the I/O (input/output) interface. If the calculated value is more than the value set in the output control circuit, the electric signal is sent to the inflator via the safing sensor.
When the inflator receives the signal from the I/O interface, the inflator generates nitrogen gas to deploy the air bag modules. The bags release the nitrogen gas from a vent hole in the back of the bag to reduce shock to the driver and passenger and to allow easier exit from the vehicle.