Occupant detection device with temperature compensation

An occupant detection device (12) for a vehicle seat is provided. The device (12) includes a sensor (40) and a spring (34). The sensor (40) is configured to indicate a first state when a seat is not occupied and a second state when the seat is occupied. The spring (34) is configured to urge the sensor (40) toward the first state. The spring (34) is also configured to provide a return force (54) that varies with a temperature (56) of the spring (34)