1. DC converter; located in the power supply unit, contains a boost/buck converter and provides the operating voltage of the SRS unit, as well as supplying voltage to the ignition circuit of the two frontal airbags in the event of a collision. If the operating voltage of the system drops below the specified critical value, the system is rebooted.
2. Redundant power circuit: The SRS unit has a redundant power circuit that provides power to the airbag deployment circuit in the event of a power failure in the main network or when it is lost in the event of a frontal collision
3. Self-diagnosis: When the vehicle is powered 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 On: If a failure is detected, the module illuminates the SRS Malfunction Warning Light on the instrument cluster. The inclusion of this control lamp indicates a failure in the SRS system. When the ignition key is turned to position "ON" SRS warning light comes on for about six seconds
5. DTC Logging: When a failure is detected, the SRS unit logs the corresponding DTC. The fault code can only be erased using a scanner. However, in cases where an internal failure or collision is registered, the codes should not be erased.
6. Self-diagnostic connector: Data from the SRSCM memory is output to a scanner or other external device through a connector located at the bottom of the front panel on the driver's side.
7. Once the airbags have deployed, the SRS unit cannot be reused and must be replaced.
8. The SRS module detects whether the passenger is wearing a seatbelt using a signal from the switch in the passenger's seat belt buckle and instructs the front seat airbag to deploy when the predetermined collision speed is reached.
9. The command to deploy the side airbag is issued by the SRS unit upon receipt of a signal from the side impact sensor, regardless of the position of the seat belt.
Only specially trained personnel are allowed to work on the airbag system. Therefore, the production of such work should be preceded by a careful study of this manual. Strict precautions must be taken when working on the airbag system in order to prevent injury to personnel (in case of accidental airbag deployment) or driver (due to airbag failure).
Driver Airbag Module (PMB), passenger airbags (PBP), includes the airbag itself and the gas generator. The gas generator is made in the form of a squib 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, as a result of which the squib ignites and the airbag is filled with gas.