A system includes a first and second circuit electromagnetically coupled
to establish a contact-less transmission, for example, between a vehicle
body and a removable seat of the vehicle body. The first circuit includes
a first inductor and the second circuit includes a second inductor. In
order to detect in the first circuit the status of one or more input
signals of the second circuit, the second circuit includes a signal
generating portion including a resistor and a capacitor that generates, a
time-pulsed signal. The second circuit is adapted to set a value of at
least one of the resistor and the capacitor based on a sensed parameter
and sets a duty cycle of the time-pulsed signal based on a value of at
least one of the resistor and the capacitor. The time-pulsed signal
changes a load of the second circuit over time which can be detected in
the first circuit.