IN-VEHICLE WIRING ABNORMALITY DETECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To detect wiring abnormality about a plurality of conducting wires reaching an electronic circuit to which a microphone is connected.SOLUTION: A wiring abnormality detection device is configured of: a detection part 36 installed in a post device 32; and a detection line 55 connected to a voltage dividing circuit 16. The wiring abnormality detection device is used for an in-vehicle circuit including: an amplifier 14 to which the microphone 12 is connected; and the voltage dividing circuit 16 connected to the amplifier 14. The in-vehicle circuit includes: a power supply line 54 for supplying power to the amplifier 14, and for applying a voltage to the voltage dividing circuit 16; a ground line 50 connected to the minus power supply terminal of the amplifier 14; and a signal line 48 connected to the amplifier 14 for transmitting a signal amplified by the amplifier 14. The detection part 36 detects the wiring abnormality of the power supply line 54 or the ground line 50 on the basis of a detection voltage Vd which appears in the detection line 55.