Car Wiring Harness Permutation

The automobile wire harness is the main body of the automobile circuit, and there are no wires. Wire as it is to point to by copper rushed contact terminals (connector) and wire and cable, pressure plastic pressure insulator again or plus metal outside shell, etc., in wire bale form connected components of the circuit. Including wire and cable, connectors, wiring harness industry chain processing equipment, wiring harness manufacturing industry and downstream applications, wiring harness application is very wide, can be used in the automotive, home appliances, computer and communications equipment, a variety of electronic instruments and meters, etc., the entire car body wiring harness connections, largely in H shape.

The car wire is also known as the low voltage wire, which is different from the normal household electric wire. Common household wire is copper single - tipped wire, with a certain hardness. The electric wires are all copper and tipped with soft wires, some of which are as thin as hair, and a few or even dozens of soft copper wires are wrapped in plastic insulated tubes (polyvinyl chloride) that are soft and not easily broken.

Commonly used

Automotive wiring harness commonly used specifications of wire nominal cross-sectional area 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 4.0, 6.0 mm2 wire (Japanese that is commonly used in nominal cross-sectional area is 0.5, 0.85, 1.25, 2.0, 2.5, 4.0, 6.0 mm2), they are allowed to load current value, with different power wire of electrical equipment. For example, the 0.5 specification line is suitable for instrument lamp, indicator lamp, door lamp, overhead light, etc. The 0.75 specification line applies to the license plate lamp, before and after the small light, brake lamp, etc.; The 1.0 specification line is suitable for turning on lamp, fog lamp, etc. 1.5 specification line for headlights, horns, etc. The main power source line such as generator armature line, wire line and other requirements 2.5 to 4 square mm wire. This just refers to general motors, the key depends on the load of the maximum current value, such as battery by iron wire, the positive power cord is a special car wire used alone, both wire diameter is larger, there are at least ten square millimeter above, these "big MAC" wire will not be codified in the main beam.


The wiring diagram is not the same as the schematic diagram of the wiring diagram. Circuit principle diagram is describe the various electrical part of the relationship between the image, it does not reflect the electrical parts how to connect with each other, not affected by the size of the various electrical components shape, and the influence of the distance between them. The wiring diagram must take into account the dimensions of the electrical components and the distances between them, and also reflect how the electrical components are connected to each other.

The technician based on the wiring harness diagram is used to line the wiring board, and the worker will line the line according to the rules of the line. The main line of the vehicle is generally divided into engines (ignition, electric spraying, power generation, starting), meters, lighting, air conditioning, auxiliary appliances, etc., with main lines and branches. A main line of the vehicle has several branches, like a tree rod with a branch. The main line of the vehicle tends to be the central part of the dashboard. Because length relationship or assembly is convenient wait for a reason, some automotive wiring harness into car wiring harness, including instrumentation, air conditioning, battery, engine, before the light assembly), the rear of the wiring harness (taillight assemblies, license plate lamp, trunk lamp), tent, wiring harness, dome light, speakers (door), etc. Wire on each end will sign on Numbers and letters, to indicate the wire connection object, the operator can see mark properly connected to the corresponding wiring and electrical device, which is especially useful when repair or replace the wiring harness. At the same time, the color of the wire is divided into monochrome and double color lines, and the use of color is also regulated, which is generally the standard of the auto factory. China's industry standard only stipulates the main color, for example, the specification of single black is dedicated to the line, red and monochrome are used for power lines, not to be confused.

The automobile wire harness can be divided into two types: the power line that carries the actuator (actuator) electric power and the input signal of the transmission sensor. A power line is a thick wire that transports a large current, and a signal line is a thin wire that does not carry electricity (optical fiber communication); For example, the cross-section area of the signal circuit is 0.3 and 0.5mm2.

In the motor and actuator, the area of the conductor is 0.85 and 1.25 mm2, while the power circuit has a section area of 2, 3 and 5mm2. Special circuits (starter, alternator, grounding wire of engine, etc.) have different specifications of 8, 10, 15 and 20mm2. The larger the cross-sectional area, the larger the current capacity. The choice of electric wire should be restricted by the physical performance of the vehicle, so the selection range is very wide. For example, the frequent open/closed doors on the rental car and the wires that span the body should be made up of well - bending conductors. The conductors used in high temperature areas are usually insulated with high heat resistance and polyethylene coated wire. In recent years, the electromagnetic shielding wire used in weak signal circuits has also been increasing.

With the increase of car function, widespread application of electronic control technology, more and more electrical parts, wires will be more and more, the circuit on the car quantity and power consumption increased significantly, the heavier wire also becomes thicker. This is a big problem to be solved, how to make a lot of wiring harness how to be more effective in the limited space reasonable decorate, make the function of auto harness play a more important, has become the auto industry are faced with the problem.