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The unattended left behind of children in parked vehicles is one of the major causes of lethal or serious injuries to children in non-traffic accidents in the U. S. For this reason Delphi is interested in the development of a low cost left behind occupant recognition so that its safety division launched the evaluation of different approaches for a reliable detection system in 2008. This contribution discusses the sensor evaluation, experiments under different conditions and the classification via data mining algorithms based on two potential approaches. The first one uses high sensitive analogue accelerometers at the car chassis and the second one is based on a pressure mat in the seat. Occupants inside the vehicle produce vibrations at the car chassis which can be monitored by the accelerometers. The needed electronic and different experimental results are explained in regard to an autonomous left behind recognition. Subsequently the experiments with the pressure mat are discussed.