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A passenger detecting system includes an antenna electrode, a signal generating circuit, a detecting circuit, and a control circuit. The antenna electrode is provided in a seat to be occupied by a passenger. The signal generating circuit generates and supplies a supply signal to the antenna electrod

A passenger detecting system includes an antenna electrode, a signal generating circuit, a detecting circuit, and a control circuit. The antenna electrode is provided in a seat to be occupied by a passenger. The signal generating circuit generates and supplies a supply signal to the antenna electrode through a resistor such that an electric field is generated around the antenna electrode. The detecting circuit includes the resistor, and detects a direct current data signal from a line voltage associated with a voltage drop across the resistor, wherein the line voltage changes depending upon an object on the seat. The control circuit determines from the detected direct current data signal, whether or not a passenger is present in the seat and whether the passenger is an adult or a child.

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A passenger detecting system includes an antenna electrode, a signal generating circuit, a detecting circuit, and a control circuit. The antenna electrode is provided in a seat to be occupied by a passenger. The signal generating circuit generates and supplies a supply signal to the antenna electrod

A passenger detecting system includes an antenna electrode, a signal generating circuit, a detecting circuit, and a control circuit. The antenna electrode is provided in a seat to be occupied by a passenger. The signal generating circuit generates and supplies a supply signal to the antenna electrode through a resistor such that an electric field is generated around the antenna electrode. The detecting circuit includes the resistor, and detects a direct current data signal from a line voltage associated with a voltage drop across the resistor, wherein the line voltage changes depending upon an object on the seat. The control circuit determines from the detected direct current data signal, whether or not a passenger is present in the seat and whether the passenger is an adult or a child. comprises a programmable selector, for selecting parameters from said vehicle data network. 11. A system according to claim 1, wherein at least one parameter stored in said first register having a changeable preferred or pre-set status, such as the gasoline level of the vehicle, is arranged to be automatically updated with the current status as stored in the first memory circuit, when an alert signal has been transmitted.