General Information

General

The Supplemental Restraint System (SRS) is designed to supplement the seat belt to help reduce the risk or severity of injury to the driver and front passenger by activating and deploying the driver, passenger, side airbags and seat belt pretensioners in certain frontal or side collisions. The SRS (airbag) consists of: the driver airbag module, located in the center of the steering wheel, which contains a folded airbag and inflator unit; the passenger airbag module, located in the instrument panel on the passenger side, which contains a folded airbag assembly with inflator unit; side airbag modules, located in the front seatbacks, which contain a folded airbag and inflator unit; curtain airbag modules, located inside the roof lining, which contain folded airbags and inflator units. The SRSCM impact detection function is performed by an electronic accelerometer that constantly measures vehicle acceleration and sends a corresponding signal through amplification and filter circuits to the microprocessor. The SRSCM (SRS Control Module) detects a frontal collision with the frontal impact sensor and a side collision with the side impact sensor, and determines deployment of the airbag modules.

1. 1
   DC/DC Converter: The DC/DC converter in the power supply includes a step-up/step-down transformer converter and provides the ignition voltage for the 2 front airbag ignition circuits and the internal operating voltage of the SRSCM. If the internal operating voltage is below the critical value, it performs a reset.
2. 2
   Backup power supply: The SRSCM has a separate backup power supply that instantly supplies deployment energy in low-voltage conditions or in case of power failure during a frontal collision.
3. 3
   Self-diagnosis: The SRSCM constantly monitors the current operating state of the SRS and detects system malfunctions while the vehicle power is on. System malfunctions can be checked using trouble codes via GDS.
4. 4
   Airbag Warning Lamp Illuminated: When a malfunction is detected, the module sends a signal to the SRS warning lamp on the instrument panel. The lamp will indicate a driver SRS malfunction. When the ignition is turned on, the SRS lamp will illuminate for approximately six seconds.
5. 5
   Diagnostic Trouble Code Recording: When a malfunction occurs in the SRSCM system, the DTC corresponding to the malfunction is stored. The DTC can only be erased using GDS. However, if an internal malfunction code is recorded or a reset error failure is recorded, it must not be erased.
6. 6
   Self-diagnosis connector: Data stored in the SRSCM memory is output to GDS or other external output devices through the connector located below the driver's airbag.
7. 7
   After the airbag has deployed, the SRSCM must not be reused and must be replaced.
8. 8
   The SRSCM determines whether the passenger is wearing the seat belt by the signal from the built-in switch in the seat belt buckle and deploys the front seat airbag at each specified collision speed.
9. 9
   Side airbag deployment is determined by the SRSCM, which detects the satellite sensor impact signal in a side collision, regardless of the seat belt condition.