General Information

General

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

1. 1
   DC/DC Converter: The DC/DC converter in the power supply unit 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 drops below the critical setting value, it will reset.
2. 2
   Backup Power Supply: The SRSCM has a separate backup power supply that instantly supplies deployment energy in a low-voltage condition or when the power supply is disconnected as a result of a frontal collision.
3. 3
   Self-Diagnosis: The SRSCM constantly monitors the current SRS operating state and system malfunction detection. When the vehicle power is turned off, system malfunctions can be checked using the trouble codes via GDS.
4. 4
   Airbag Warning Lamp Illuminates: When a malfunction is detected, the module sends a signal to the SRS indicator lamp on the cluster. The MIL lamp notifies the driver of an SRS malfunction. When the ignition key is turned on, the SRS indicator lamp illuminates for approximately six seconds.
5. 5
   Diagnostic Trouble Code Recording: When a malfunction occurs in the system, the SRSCM stores the DTC corresponding to the malfunction. The trouble code can only be cleared using GDS. However, if an internal trouble code is recorded or a system failure is recorded, the troubleshooting should not be performed.
6. 6
   Self-Diagnosis Connector: Data stored in the SRSCM memory is output to the GDS or other external output devices through the connector located under the protective cover on the driver's side.
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 the front seat deployment 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 status.