Pyrotechnic Actuator

The pyrotechnic actuator contains a detonator pellet.

As soon as the detonator pellet receives the detonation signal, the propellant is ignited.

The propellant deploys the release pin. The release pin pushes the release plate downwards, thereby releasing the actuating springs so that they push the impact plate and head restraint cushion forwards and upwards.

The pyrotechnic actuator contains a resistor that artificially keeps the signal at high after the head restraint has been deployed.

The Check Control message is generated by the safety systems control unit.

The signal for the Check Control message is transmitted via the vehicle's bus system to the instrument cluster. The instrument cluster displays the Check Control message. The Central Information Display may also display a complementary message.