To reduce the wast of circuit components, to reduce costs, to prevent extension and to simultaneously improve the degree of freedom for design and workability for production.
A microcomputer 3 at transmitting/receiving equipment 2 is switched to active state corresponding to the output of a power supply part 10 for rectifying a carrier wave signal in the state of receiving that carrier wave signal from a transmission/reception ECU on the vehicle side to a resonance circuit part 6 and when a lock switch 13 or an unlock switch 14 is turned on, corresponding to the output of a secondary battery 12, the microcomputer is switched into active state through a switching circuit 15. When an operating signal corresponding to the operation of the unlock switch 14 is received, the microcomputer switched into active state performs control for transmitting a remote signal through a transmission circuit part 5 and when an inquiry signal is received through the resonance circuit part 6, control is performed for transmitting a response signal containing an identification code in an EEPROM 4 through an output interface part 19 and the resonance circuit part 6.
MIZUNO TAKASHI
KOGA SHINICHI
KOKUBU SADAO
