Abstract: Method and apparatus are provided for a vehicle seat weight detection system utilizing a metal deformation type energy attenuating device disposed in a load path between a seat and a vehicle structure. The energy attenuating device includes a weight sensing portion with a first end connected to one of the seat or vehicle structure, and a second end configured to transfer the seat weight load to a deformable portion of the energy attenuating device connected to the other of the seat and vehicle structure. An aperture in the weight sensing portion between the first and second ends divides a region adjacent the aperture into first and second sides. A slot intersecting the aperture and lying on a plane generally perpendicular to the load path divides the second side into upper and lower halves. A sensor on a surface of the first side of the weight sensing portion is configured to detect strain variations in the surface and produce a calibrated weight signal.