A sensor module for use in a low-cost weight-measurement and sensing system is provided. The sensor module may include a substrate configured to be mounted between a floor pan of a vehicle and a seat of the vehicle. The sensor module may further include a force sensing element disposed upon the substrate. The force sensing element may be configured to sense a force applied thereupon, and generate a reading representative of the force applied thereupon in response thereto to provide a sensor reading. The sensor module may also include a wiring harness connected to the force sensing element. The wiring harness may be configured to transmit the sensor reading to a control module. The substrate may define an aperture configured to surround a fastening element used to fasten the seat to the floor pan of the vehicle.