Pic. 1.172. System of seat belts with a pretensioner: 1 – control lamp SRS; 2 - seat belt pretensioner assembly; 3 - electronic control unit SRS
The vehicle is equipped with seat belts with pretensioners for the driver and front passenger. The purpose of such a belt is to provide a clear fixation of the passenger in some cases during a frontal impact. The seat belt pretensioner may deploy alone or in conjunction with the airbags in the event of a frontal impact of sufficient severity.
If the passenger brakes hard or leans forward hard, the seat belt latch will engage and lock the seat belt. In some fairly severe frontal collisions, the seat belt pretensioner will activate and retract the seat belt to more securely restrain the occupant.
After the pretensioner is activated, if the belt tension is too strong, a special tension force limiter will loosen the belt.
Note. The pretensioner seat belts for the driver and front passenger will deploy in the event of a frontal impact of sufficient severity. The seat belt pretensioners may deploy alone or in conjunction with the airbags in the event of a frontal impact of sufficient severity. The seat belt pretensioners will deploy in any severe frontal impact, even if the seat belt is not fastened.
Note. When the seat belt pretensioners deploy, a small amount of smoke is emitted and a strong popping sound occurs. These phenomena are normal and not dangerous.
Note. Although this smoke is not poisonous, it should not be inhaled as it may cause irritation, coughing or choking. Wash your face and hands thoroughly after deploying the seat belt pretensioners.
Attention! After turning the ignition key to position «ON» («On») control lamp of additional system of passive safety SRS (airbags) flashes for about 6 seconds and then turns off. This is due to the fact that the sensor that activates the SRS airbags is included in the seat belt pretensioner circuit.
This lamp also illuminates if the pretensioner seat belt has a malfunction.