General Information

General Information

The Supplemental Restraint System (SRS) is designed to supplement the seat belts as a safety device to reduce the risk or severity of injuries to the driver and passenger resulting from the deployment of the driver's, passenger's and side airbags and seat belt pretensioners in the event of a frontal or side impact. The SRS (airbag) consists of: the driver's airbag module, including a folded airbag and inflator, located in the center of the steering wheel; the passenger's airbag module, including a folded airbag and inflator, located in the glove box on the passenger side; side airbag modules, each including a folded airbag and inflator, located in the front and rear seats; curtain airbag modules with folded airbags and inflators located inside the roof trim. The impact detection function of the SRSCM is supported by an electronic accelerometer sensor, which continuously measures acceleration and sends the corresponding signal to the microprocessor through an amplification and filtering circuit. SRSCM (SRS Control Module): The SRSCM detects frontal impacts using frontal impact sensors and acceleration sensors built into the SRSCM. For side impacts, the SRSCM detects side impacts using 4 side impact sensors, 2 normal acceleration sensors located inside the center pillars, 2 pressure sensors on the front door modules, and an internal acceleration sensor in the SRSCM. The SRSCM is designed to deploy the appropriate airbag module through the sensor inputs described above.

1. 1
   DC/DC Converter: The DC/DC converter in the power supply includes a high/low level converter and provides the ignition voltage for all circuits implemented in the ASIC and the operating voltage inside the SRSCM. If the internal operating voltage falls below a critical value, a reset occurs.
2. 2
   Backup power: The SRSCM includes a backup power supply, an individual booster that instantly supplies deployment voltage in low-voltage conditions or after power loss caused by a frontal impact.
3. 3
   Self-Diagnosis: The SRSCM continuously monitors the current operating condition of the SRS and, when powered by the vehicle's network, will detect any system malfunction. Diagnostic trouble codes can be checked using the GDS.
4. 4
   Airbag Warning Light (MIL) Illumination: When a malfunction is detected, the module sends a signal to the MIL in the SRSCM instrument cluster. The MIL informs the driver that there is an SRS malfunction. When the ignition is turned on, the SRS warning light illuminates for six seconds.
5. 5
   Diagnostic Trouble Code Recording: As soon as a malfunction affects the system, the SRSCM stores the DTC related to the malfunction. The DTC cannot be erased except by using the GDS. However, if an internal malfunction code is active or a collision has been recorded, the malfunction cannot be reset.
6. 6
   Self-Diagnosis Connector: Data stored in the SRSCM memory is transmitted to the GDS or any other external output device through the connector located under the instrument panel on the driver's side.
7. 7
   After airbag deployment, always replace the SRSCM.
8. 8
   The SRSCM determines whether the passenger has fastened the seat belt using the signal sent by the switch built into the seat belt circuit, and deploys the front passenger airbag each time at a set collision speed.
9. 9
   The SRSCM determines side airbag deployment using the impact signal sent by the satellite sensor, regardless of the seat belt buckle status.