Abstract: A side impact sensor system is used in a vehicle having a side air-bag, a lower body component, and a body side with a front door belt line area. The system includes a body side impact sensor mounted to the body side at least as high as the front door belt-line area. A lower body side impact sensor is mounted to the lower body component inboard from the body side. A safing sensor is secured to the vehicle. Electronic control module is provided in the electrical communication with the side air-bag and with the sensors for sending firing signals to the side air-bag when the safing sensor and at least one of the body and lower body side impact sensors signal a sufficiently high lateral acceleration indicative of a side impact.