The system includes two pyrotechnic devices mounted on the side of the front seats and an electronic control unit.
The ECU is installed under the center console and consists of a deceleration sensor and an amplifying unit. If the sensor perceives a deceleration beyond a certain limit, the amplifying block sends a signal to the fuses in the blocks
seat belt tensioners. On most models, the electronic pretensioner control unit is integrated into the airbag control unit.
As soon as the fuse is fired, the small primer instantly releases gas, filling the pretensioner cylinder. The piston in the cylinder, moving along the cylinder, pulls the cable (about 70 mm), by tightening the seat belt accordingly.
After the seat belt pretensioner has deployed, it must be replaced.
Attention! Do not overheat pretensioners. If any work on the vehicle requires heavy impact on vehicle parts, remove the fuse for the pretensioner control system by de-energizing it and wait at least 5 minutes for the system to deactivate. Installing any systems with magnets (e.g. loudspeakers), do not place them close to the pretensioner control unit.