Abstract: A technique disclosed in this specification relates to a technique for detecting a location of a conduction failure due to aging degradation or the like by a simple method. A connector relating to the technique of this specification includes a connector housing (30) having a cavity (31) and a terminal (12) to be connected to a terminal (12A) serving as a mating conductive member across an insulating film (13) and accommodated into the cavity (31).

Abstract: A ground terminal with a novel structure is provided that enables reliable detection of loosening of a terminal. A ground terminal that is bolted to ground a ground wire of a vehicle-mounted device to a negative terminal of a battery, the ground terminal including: a connection portion that has a bolt insertion hole into which a bolt used for the bolting is inserted. A piezoelectric element is provided surrounding the bolt insertion hole of the connection portion.

Abstract: A technique disclosed in this specification relates to a technique for detecting a location of a conduction failure due to aging degradation or the like by a simple method. A connector relating to the technique of this specification includes a connector housing (30) having a cavity (31) and a terminal (12) to be connected to a terminal (12A) serving as a mating conductive member across an insulating film (13) and accommodated into the cavity (31).

Abstract: A ground terminal with a novel structure is provided that enables reliable detection of loosening of a terminal. A ground terminal that is bolted to ground a ground wire of a vehicle-mounted device to a negative terminal of a battery, the ground terminal including: a connection portion that has a bolt insertion hole into which a bolt used for the bolting is inserted. A piezoelectric element is provided surrounding the bolt insertion hole of the connection portion.

Abstract: An aim is to provide a terminal-equipped circuit board that has a novel configuration that is simple and can prevent a vehicle from catching fire after submersion. A terminal-equipped circuit board includes: a circuit board; and a plurality of terminals that are provided upright on the circuit board. The plurality of terminals include a positive terminal that is connected to a power supply line and a negative terminal that is connected to a ground line. At least one of the positive terminal and the negative terminal is enclosed by an impervious insulating tube member that is provided therearound. The positive terminal and the negative terminal are located adjacent to each other.