Airbag Control Module

AIRBAG CONTROL MODULE




The airbag control module is installed inside the center console and contains a safety sensor, G sensor, ignition judgment circuit, and a backup power supply, etc.

The control module receives electric signals from the safety sensor and electric sensor inside the module and also from the front sub sensor to detect the deceleration of the vehicle and judge whether the airbag and pretensioners should be ignited or not. It also has a self diagnosis function which lights up the airbag warning light in the combination meter if a fault occurs in the system. Diagnostic trouble codes generated by the self diagnosis function are stored in the memory in the module.

To prepare for battery voltage fall in an event of an accident, the control module is provided with a backup power supply.

- Safety sensor
Inside of the sensor there is a mass weight, which works as a pendulum; if the sensor detects an impact acceleration exceeding a certain limit, the mass weight in the sensor moves to close the contacts and turn the switch ON.

- G sensor
Inside of the sensor there are comb-teeth shaped electrodes; in case of a collision the distance between the electrodes varies by the impact to enable detection of the impact acceleration.