(1) Wiring harness burn fault detection and judgment
Harness burned, are sudden and fast burn, burn the lines, generally no safety device. Harness burn rule is: the circuit power supply system, which point grounding, wire bundles to burn where it burned and intact parts of the junction, where the wire can be considered Ground; if the wire bundles to burn When connecting part to an electrical device, it indicates that the electrical equipment failure.
(2) short circuit, poor contact between the line fault detection and judgment
Squeezed by external wiring harness, shock, causing internal damage to the wiring harness wire insulation, causing a short circuit between the wires, so that some of the electrical equipment out of control, a blown fuse. When the judge, can open the wiring harness connector for electrical equipment and control across the switch, the electrical short circuit at a table or pilot light detection circuit.
Wire circuit failure, in addition to the obvious breakage, the common failure occurs between the wire and the wire terminals. After some wire circuit, an insulating layer and an outer conductor terminal intact, but the inner core wire and lead wire terminals are disconnected. When the judge may suspect breaking conductive wire and the lead terminals do tensile test, tensile test, such as wire insulation tapers, it can confirm that the wire is broken.
Line is bad, the fault occurred in the connector. When a fault occurs, it will cause the electrical device is not working properly. When the judge, turned on the electrical equipment supply, touch or pull the connector of the electrical equipment concerned, when the touch of a connector, the work of the electrical equipment suddenly normal, suddenly not normal, indicating that the connector there is a fault, electronic wiring harness assembly replacement.
1. Check the appearance
(1) The new electronic wiring harness models should be consistent with the original model, lead terminals and wires reliable, available hand pull each connector and wire loose, shedding phenomenon.
(2) The new electronic wiring harness and compare the original electronic wiring harness, such as: the size of electronic wiring harness, wire terminal connectors, wire color should be consistent. Department of doubt, can multimeter testing, confirm that the electronic wiring harness intact before replacement.
2. Electronic wiring harness installation
Each connector electrical equipment, plugs, sockets and electronic wiring harness shall correspond to the socket, plug. After each connection wire and electrical equipment connected to leave a margin, you can not pull the wire too tight or too loose put.
Inspection and test turned />
After the electronic wiring harness replaced, first check the wiring harness connector to connect electronic and electrical equipment is correct, the battery positive and negative is properly connected.
(2) The current test
Ground line battery may temporarily not connected with a 12V, 20W bulbs so do test lamp, the test lamp connected in series between the negative battery terminal and the frame Ground, closed car all electrical equipment switches. Normal test light should not shine, otherwise show circuit failure. When the circuit is normal, remove the bulb, with a capacity of 30A fuse, connected in series between the negative battery terminal and the frame grounding, do not start the engine, turn on the car one by one each power supply electrical equipment, electrical equipment and line check, in the absence of fault confirmation of electrical equipment and wiring, remove the fuse, connect the battery Ground line.