The rear safing sensor is located under the rear seat cushion. This sensor operates in the same manner as the SRS unit's internal side impact G sensor but improves the cross-check of side impacts to the rear part of the vehicle body. It measures sideways G force, such as the force the vehicle would receive in a side collision in the rear, and sends that information to the SRS unit. The SRS unit uses that information, and the information from the side impact sensors to determine the side that is impacted and the force. If the impact exceeds the preset threshold value, it is converted into an electrical signal, which is transmitted to the SRS unit.