1. A vehicle seat belt system comprising:a seat belt comprising a webbing;
a connector tongue connected to the webbing;
a buckle configured to releasably connect with the tongue;
an electric powered heater connected to the webbing; and
electrical circuitry provided on the connector tongue and the buckle to conduct a voltage supply and ground voltage return between a power source and the heater via contacts on the tongue and the buckle when the tongue is connected to the buckle.