SUPPLEMENTARY RESTRAINT SYSTEM (SRS) 1 1.1. WORKING OF RESTRAINTS RESTRAINTS WITH AIRBAGS This restraint system falls under the category of Supplementary restraint system. SUPPLEMENTARY RESTRAINT SYSTEM (SRS) Air bags are the secondary restraint system, as the vehicle occupant for the activation of air bags requires no action. !! WARNING Every occupant shall wear seat belts whenever they ride a vehicle. This is applicable whether a vehicle is equipped with supplementary restraints systems (SRS) or not. WORKING OF SRS Whenever there is an accident the sensor mounted remotely sends crash signal to the ECU. The type of accident and its severity, determines the time-tofire different airbags in the system. The basic function of an airbag is to provide cushioning effect to occupants. There are remote sensors mounted for sensing different frontal and side accidents. These sensors are connected to the electronic control unit (ECU) of the system. When an accident event input signal crosses a pre-defined threshold level in ECU, the ECU triggers the relevant restraints components in the system. This helps in providing necessary protection to occupants. The airbags and seat belt pretensioners get triggered through ECU signal. The load limiter in the seat belts is a mechanical device which gets activated when the forces on the occupant upper body region crosses a defined force threshold limit. WARNING RPLL seat belts for Driver and Passenger should be fitted only in the vehicle fitted with both frontal airbags. COMPONENTS 1. ECU 2. Remote Sensors Front remote sensor / Front Impact Sensor Side remote sensor / Side Impact Sensor 3. Air bags Driver air bag Passenger air bag Side air bag Curtain air bag 4. RPLL 5. Clock spring 6. Airbag warning lamp 7. PAB deactivation switch 8. PAB indicator 9. Airbag warning labels
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