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1. A disconnection detection device for an in-vehicle device having a load circuit, a load drive circuit which controls supply of drive power for driving the load circuit, and a first wire harness which has one end connected to the load drive circuit and the other end connected to the load circuit and supplies the drive power from the load drive circuit to the load circuit,
wherein the disconnection detection device detects disconnection of the first wire harness, the disconnection detection device comprising: a second wire harness which is arranged along at least a part of the first wire harness; a current circuit which supplies a current for disconnection detection to the second wire harness; and a disconnection determination circuit which monitors an output voltage of the current circuit so as to determine presence or absence of disconnection of the second wire harness, wherein disconnection of the second wire harness is detected as the disconnection of the first wire harness based on disconnection determination of the disconnection determination circuit, wherein the load circuit includes at least two horns which output horn sound, wherein the load drive circuit includes a drive switch which supplies the drive power to the two horns, wherein the disconnection determination circuit monitors the output voltage of the current circuit so as to determine the presence or absence of disconnection of the second wire harness, and turns on the drive switch so as to allow the drive power to be supplied to the first wire harness in a case where disconnection of the second wire harness is detected, and wherein the drive power is supplied to the horn connected to the first wire harness on a non-disconnection side of at least the two horns to output horn sound from the horn. |
