Methods for classifying and ascertaining the identity of an object in a seat in a vehicle in which a wave-receiving sensor receives waves at least from a space above the seat and generates a signal representative of the received waves and a weight sensing system obtains information about the weight being applied to the seat. Tests are conducted on different objects, each test entailing receiving waves by means of the wave-receiving sensor and the information about the weight being applied to the seat from the weight sensing system while that object is situated in the seat and associating the signal representative of the received waves and information about the weight being applied to the seat with that object. An algorithm is generated from the tests and adapted to process a signal representative of waves received by the wave-receiving sensor and information about the weight being applied to the seat from the weight sensing system and classify or identify the object most closely associated therewith. In use, waves are received by the wave-receiving sensor and a signal representative thereof is generated and information about the weight being applied to the seat is obtained by the weight sensing system. The signal representative of the received waves and information about the weight being applied to the seat are input to the algorithm to thereby classify or ascertain the identity of the object. A component may be adjusted based on the classification or identity of the object.