1. DC-DC converter; is located in the power supply unit, contains a step-up/step-down converter and provides the operating voltage of the SRS unit, as well as the supply of voltage to the ignition circuits of the two front airbags in the event of a collision. If the operating voltage of the system drops below a specified critical value, the system is rebooted.
2. Redundant power supply circuit: The SRS unit has a redundant power supply circuit that supplies voltage to the air bag deployment circuit when the main power supply voltage drops or is lost in the event of a frontal collision
3. Self-diagnosis: When the vehicle power is on, the SRS unit constantly monitors the status of the SRS system and detects its malfunctions, the codes of which can be checked using a scanner.
4. Airbag warning light illuminates: When a malfunction is detected, the module illuminates the SRS malfunction indicator light in the instrument cluster. When this indicator light illuminates, it indicates a malfunction in the SRS system. When the ignition switch is turned to the "ON" position, the SRS indicator light illuminates for approximately six seconds
5. Trouble code recording: When a malfunction is detected, the SRS unit records the corresponding trouble code. The trouble code can only be erased using a scanner. However, in cases where an internal malfunction or a collision is detected, the codes should not be erased.
6. Self-diagnosis connector: Data from the SRSCM memory is output to a scanner or other external device through the connector located at the bottom of the dashboard on the driver's side.
7. Once the airbags have deployed, the SRS unit cannot be reused and must be replaced.
8. The SRS unit determines whether the passenger is wearing a seat belt based on a signal from the switch in the passenger seat belt buckle and commands the front seat airbag to deploy when a predetermined collision speed is reached.
9. The command to deploy the side airbag is issued by the SRS unit upon receiving a signal from the side impact sensor, regardless of the position of the seat belt.
Only specially trained personnel are allowed to perform work on the airbag system. Therefore, such work must be preceded by a careful study of this Manual. When performing work on the airbag system, strict precautions must be taken to prevent injury to service personnel (in case of accidental airbag deployment) or the driver (due to the failure of the airbag).
The driver airbag module (DAM), passenger airbag (PAM), includes the airbag itself and a gas generator. The gas generator is made in the form of a pyropatron with an igniter. In the event of a frontal or side impact of sufficient force, causing the ECU sensor contacts to close, current is supplied to the ignition circuit, resulting in the pyropatron being ignited and the airbag being filled with gas.