Troubleshooting and repair of automotive circuit faults require a combination of systematic diagnosis and targeted treatment. Common issues include short circuits, open circuits, and poor contact. Short circuits are usually caused by damaged insulation or water ingress in connectors. The resistance between the circuit and the vehicle body can be measured using the ohmmeter function of a multimeter (normal reading should be >10Ω). If the value is lower, repair the damaged area or replace the waterproof seal. Open circuits are mostly due to broken wires or blown fuses. Continuity should be checked section by section. When soldering broken wires, use heat shrink tubing for insulation, and always identify and eliminate the cause of overload before replacing a fuse. Poor contact often results from oxidized terminals or loose connectors. During operation, first visually inspect the wiring harness for aging or looseness, then use the voltmeter function to measure voltage drops at key points (normally <0.1V). Always disconnect power before repairs, and consult professional technicians for complex faults to avoid exacerbating damage through improper handling. Regular inspections of wiring harness security and connector sealing can prevent circuit malfunctions.
