Safety Belt Sensors

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The buckle of each front safety belt incorporates a Hall effect sensor that provides a safety belt status signal to the RCM. When a safety belt is unfastened the sensor outputs a low current to the RCM. When the safety belt is fastened the switch outputs a high current to the RCM.

The RCM broadcasts the status of the two front safety belts on the high speed CAN bus for use by the instrument cluster. In the event of a front impact the RCM will deploy the pretensioners provided the safety belt buckles are fastened. The pretensioners have a lower deployment threshold than that required by the air bags. Hence it is possible during a minor collision, which exceeds the deployment threshold, that only the pretensioners will deploy.

For additional information, refer to: Safety Belt System (Description and Operation).