Hood Hinge Actuators

The pedestrian hood actuators deploy only when a valid signal whose energy is capable of triggering deployment of the hood is present. The pedestrian hood actuators only deploy in those events where the activation of the hood is expected. The hood actuator is not expected to deploy in low severity event where the risk of injury is low or in a high severity event like car to car crash. During a frontal pedestrian impact of sufficient force, the Inflatable Restraint Sensing and Diagnostic Module will allow current to flow through the deployment loops in order to deploy the hood hinge actuators. The Inflatable Restraint Sensing and Diagnostic Module also performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity, shorts to ground and shorts voltage. In order to prevent unwanted deployment of the actuator during service, the hood hinge actuator contains 2 shorting bars that will short both high and low circuit pins when disconnected. The Inflatable Restraint Sensing and Diagnostic Module only issues a deployment command when a valid Pedestrian Impact Detection Sensor signal or confirmation has been generated. No inadvertent deployments will occur in any deployment loop due to a single point fault.