| 摘要 |
A vehicle includes a direct current power supply (supply), an electric circuit (circuit) supplied with a current from the supply, a connector with relays that connects and disconnects a path supplying the current to the circuit, and a voltage sensor (sensor) that monitors the path between the connector and the circuit. A controller provides control to connect and disconnect the connector. The controller then brings part of the relays into conduction to provisionally determine conduction fault of a relay that is to be non-conductive in accordance with an output of the sensing portion. When a result indicates fault, the controller stores the sensor output as a first value, brings some relays out of conduction, brings other relays into conduction, and compares the value and the sensor output to determine whether to confirm the provisional determination. Thus, fault diagnosis time is reduced.
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