| 摘要 |
There is provided a circuit with control function including a circuit to be controlled so as to be operated only if a predetermined environment meets a specific condition and being arranged to detect, in any predetermined environment, whether or not the circuit with control function is normally operated, and a test method thereof. The circuit with control function includes a controller (microcomputer) for operating the circuit to be controlled (a heater) only if a predetermined environment (ambient temperature) detected by a sensor (a first temperature sensor) meets a specific condition (0° or below). The controller includes a self-diagnosis device for diagnosing whether or not the circuit with control function is normally operated (step S 5 ) and an interruption detecting device (steps S 1 to S 4 ) for detecting whether or not energization from a commercial power supply is intermittently interrupted in a predetermined pattern and activating the self-diagnosis device when the interruption of the predetermined pattern is detected.
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