Methods of checking automotive wiring harness faults

Automotive wiring harness is the main network of automotive circuits. Without automotive wiring harness, there would be no automotive circuit. The wire harness is a component in which a contact terminal (connector) made of copper material is pressed against an electric wire and cable, and then a power supply circuit is connected by bundling an external plastic insulator or an additional metal casing.

Methods that can be detected when the automobile wiring harness fails: 1. Test method of special tools for automobile wiring harness. The test lamp detection method is more suitable for checking the general fault state of open circuits of transmission lines. When using the temporary test lamp method, the output power of the test lamp does not have to be too large. When detecting whether the operation output terminal of the instrument panel of the electronic equipment has output or whether there is sufficient output, special care should be taken to avoid overload damage to the instrument panel. It is best to use a diode test lamp. II. Visual test method of automobile wiring harness. When a common fault occurs in a part of the automobile electrical system, abnormal conditions such as smoke, flame, sound, burnt smell, and high temperature will occur. Through visual inspection of the listening, touch, smell, automobile wiring harness and household appliances of body sensory organs, the location of common faults can be distinguished, which greatly speeds up the maintenance speed. For example, when common failures occur on automobile routes, abnormalities such as smoke, flames, sounds, smell of burnt plastic, and high temperatures often occur. According to the intuitive inspection, it is possible to quickly distinguish the location to which the fault belongs and the general fault characteristics. The test method of automobile wiring harness instrument equipment uses comprehensive fault detector, digital multimeter, oscilloscope, current clamp and other instrument equipment to diagnose automobile circuit faults. For automobiles with electronic control system, comprehensive fault diagnosis instruments are generally used to search for fault codes and determine the scope of automobile faults. Then, use a digital multimeter, current clamp or pipa to check the working voltage, resistance, current or waveform of the relevant power circuit to determine the fault of the automobile wiring harness transmission line.

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