Abstract: A vehicle includes first and second power supply cords. Positive and negative electrodes of a battery are connected to a first power supply portion and a first ground portion of a first circuit, respectively, by the first power supply cord, and connected to a second power supply portion and a second ground portion of the second circuit, respectively, by the second power supply cord. The first circuit includes a control circuit configured to measure voltages of the second power supply portion as a first voltage and as a second voltage with reference to a potential of the first ground portion and a potential of the second ground portion, respectively. In a case in which the first and second voltages have a predetermined relationship, power supplied from the second power supply cord to the second circuit is set to be a predetermined value or less.

Abstract: A vehicle includes first and second power supply cords. Positive and negative electrodes of a battery are connected to a first power supply portion and a first ground portion of a first circuit, respectively, by the first power supply cord, and connected to a second power supply portion and a second ground portion of the second circuit, respectively, by the second power supply cord. The first circuit includes a control circuit configured to measure voltages of the second power supply portion as a first voltage and as a second voltage with reference to a potential of the first ground portion and a potential of the second ground portion, respectively. In a case in which the first and second voltages have a predetermined relationship, power supplied from the second power supply cord to the second circuit is set to be a predetermined value or less.

Abstract: A load short-circuit detection method is a load short-circuit detection method executed in a load drive device including: a power storage element that stores electric power for driving a load; a first switch that is connected to a low-potential side of the load and controls a current flowing through the load; and a voltage detection circuit that detects a voltage of a current flow path flowing from the power storage element to a low-potential side power supply via the first switch. The load short-circuit detection method includes: PWM-driving the first switch at a predetermined duty ratio; and detecting that the load is being short-circuited in a case where a state in which the voltage of the current flow path detected by the voltage detection circuit is lower than or equal to a predetermined threshold voltage continues for a predetermined period of time or longer.