General Information

General

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

1. 1
   DC/DC Converter: The DC/DC converter in the power supply includes a step-up/step-down transformer converter and supplies ignition voltage to the 2 front airbag ignition circuits and internal operating voltage to the SRSCM. If the internal operating voltage falls below the critical setting value, the system will be 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 in case of power failure due to a frontal collision.
3. 3
   Self-Diagnosis: The SRSCM constantly monitors the current SRS operating status and system failure detection when vehicle power is on. System failures can be checked by diagnostic trouble codes using GDS.
4. 4
   SRS Warning Lamp Illumination: When a fault is detected, the SRSCM sends a signal to the SRS warning lamp located on the cluster. The MIL lamp indicates an SRS driver fault. When the ignition is turned on, the SRS lamp illuminates for approximately six seconds.
5. 5
   Diagnostic Trouble Code Recording: When a fault occurs in the system, the SRSCM stores the DTC corresponding to the fault. The DTC can only be cleared with Hi-Scan. However, if an internal fault code is recorded or if a collision is recorded, the fault will not be cleared.
6. 6
   Self-Diagnosis Connector: Data stored in SRSCM memory is viewed using GDS.
7. 7
   After airbag deployment, the SRSCM must be replaced with a new SRSCM.