Location of the SRS system components on the vehicle.
1 - driver's frontal airbag module, 2 - coiled wire, 3 - passenger's frontal airbag module, 4 - SRS electronic control unit, 5 - deployed side airbag, 6 - side impact sensor, 7 - seat belt pretensioner.
1. Additional passive safety system (SRS) designed to be used in conjunction with seat belts to improve safety in crashes and reduce the risk of injury from front and side airbag deployment by keeping front passengers seated in the event of a frontal or side impact.
2. The SRS system consists of the following components:
- A) Airbags, each containing a folded airbag module and an inflator (gas generator with electric ignition): driver's frontal airbag (located in the center of the steering wheel), front passenger airbag (located in the instrument panel on the passenger side), side airbags (located in the outer sides of the front seat backs).
- b) Seat belt pretensioners for the driver and front passenger, each containing a gas generator with an electric igniter, a belt tensioner (knot with balls), inertial blocking mechanism and load limiter (deformable at ultimate belt tension).
- V) SRS electronic control unit (installed under the front of the center console), which manages and diagnoses the system; the main impact sensor is built into the control unit, which activates the airbag module circuit in situations requiring airbag deployment, and the safety impact sensor (or deceleration sensor), which is triggered when a vehicle deceleration value exceeding the nominal value is detected (impact from outside).
Note: a voltage drop or surge in the on-board network does not lead to the shutdown of the SRS system, since the voltage value is regulated within acceptable limits by a voltage converter built into the SRS electronic control unit.
- G) Side impact sensors for driver and passenger (located opposite the central pillars of the body) and frontal impact sensors, working as a deceleration sensor in constant mode with feedback from the SRS control unit.
- d) Seat belt switches, OFF state which prevent useless deployment of the airbags and the seat belt pretensioner in the event of an accident.
- e) Coiled wire connecting the steering wheel airbag module to the steering column wiring, which allows the steering wheel to rotate while maintaining contact in this circuit.
- and) Wiring and connectors of the SRS system.
Attention: the insulation of the SRS wiring harness is yellow (except for the wiring of the front seats) to distinguish it from the wiring of other vehicle systems.
- h) SRS indicator (located on the instrument cluster).
- And) Passenger presence sensor in the front seat. If the weight detected by the sensor is less than 15 kg, the passenger's front airbag will not deploy in an accident.
3. On ETACS models, the SRS ECU has a built-in "Emergency exit", which is used to unlock the door locks in case of an accident.
4. To work on maintenance of additional passive safety systems (SRS), as well as related items, are allowed only by qualified personnel. Service personnel must read this chapter carefully before starting work.
Special care must be taken when servicing the SRS system to avoid injury or death to service personnel (as a result of unauthorized deployment of the airbag and seat belt pretensioner), or the driver (as a result of the inoperability of the SRS system after unskilled service or repair).