Abstract: A passive seat belt system for controllably restraining a passenger in an automotive vehicle in response to the opening and closing states of a vehicle door. The passive seat belt system is comprised of a seat belt which selectively takes a passenger releasing position at which the passenger is released from restraint and a passenger restraining position at which the passenger is restrained. A door switch is provided to output first and second signals when a vehicle door is in opening and closing states, respectively. A control circuit is electrically connected to the door switch and arranged to output a third signal in response to the first signal. A driving device is electrically connected to the control circuit and arranged to drive the seat belt in the direction of the passenger releasing position when being supplied with the third signal from the control circuit.

Abstract: A vehicular voltage regulating system is mounted on an automotive vehicle equipped with an on-board electronic control device which is required to operate even when an ignition switch is turned OFF. The electronic control device is adapted to control operation of a passive seat belt arrangement. The voltage regulating system is comprised of detecting means for detecting starting operation for the electronic control device and outputting a first signal. Voltage regulation commanding means is provided to command voltage regulation by outputting a second signal for a predetermined time from a time at which the detecting means outputs the first signal.