Car harness diagram

The wiring harness diagram of the whole vehicle is often used for the connection, overhaul and wiring of the automobile assembly line and repair shop. The wiring harness diagram mainly indicates the connection positions of the electrical harnesses of the wire harnesses, the markings of the terminal posts, the wire ends, the shape and position of the connector (connector), and the like, and it is a circuit diagram of an automobile that people can actually come into contact with on the vehicle. This type of drawing generally does not go into detail about the direction of the electric wires inside the wiring harness , and only numbers or marks the terminals and connectors exposed outside the wiring harness in detail. It is a circuit representation that highlights the assembly marks and is very convenient for installation, wiring, inspection and maintenance. If the line ends of this figure are marked with the serial number and color accurately and used together with the circuit schematic and wiring diagram, it will play a greater role and can receive better results. With the development of automotive electronics technology, automotive circuit diagrams have become more and more complex and increasingly important. Therefore, how to quickly and accurately read automotive circuit diagrams is a common headache for many vehicle maintenance personnel. The common expressions of automotive circuit diagrams include circuit diagrams, schematic diagrams, and harness diagrams. The circuit diagram features the circuit diagram is the traditional way of expression of automotive circuit diagram, it will be the actual location of the car in the car corresponding to the outline diagram on the circuit diagram, and then the circuit, switches, fuses, etc. and these electrical appliances Connect one by one. When looking up the line, the branches and contacts in the wire are easy to find, and the direction of the line is basically the same as the direction of the actually used wire harness on the car. The disadvantages are: lines are dense and criss-cross, which makes it very inconvenient to read pictures and find and analyze faults.

The main points of reading the circuit diagram:

1. There is a certain understanding of the structure and principle of the electrical equipment used in the car, and the specification of its electrical equipment is relatively clear;

2. Recognize the name and quantity of all electrical equipment of the vehicle and its actual installation position on the vehicle.

3. Understand the actual meaning of each terminal by reading the number and name of the terminal of each type of electrical equipment. Characteristics of Schematics are graphical symbols that are specified by the national government. The instruments and various electrical equipments are connected logically from top to bottom according to the circuit principle, and then they are arranged horizontally. The characteristics of the schematic diagram are as follows: The circuit diagram is highly simplified, the diagram is clear, the circuit is simple and straightforward, easy-to-understand, and the circuit connection control is clear. This helps to quickly find and troubleshoot faults.

The main points of reading the schematic:

1. Read which terminal of each circuit device is connected to each terminal of each electrical device.

2. Read the branch line of the circuit equipment;

3. Read the switches , fuses , relay structures and functions on the sub-circuits. The characteristics of the harness diagram The harness diagram is an automobile factory, after the actual lines on the car are arranged, and the related wires are bundled into bundles after they are bundled together. The characteristics of the wiring harness diagram are: on the drawing surface, the serial number of each wire, the name of the connected appliance and the name of the terminal, and the serial number of the plugs and sockets of the connectors are highlighted. As long as the installation operator connects the wire or connector according to the serial number marked on the diagram to the corresponding electrical terminal or connector, the installation of the entire vehicle circuit is completed. This diagram is helpful for installation and maintenance, but it cannot Explain the direction of the line and the line is simple.

Harness diagram reading points:

1. Recognize that there are several groups of harnesses, the name of each harness, and the actual installation position of each harness in the car.

2. Recognize which electrical devices on the vehicle each branch of the harness lead to, each branch of the fork has several wires, their color and label, and which terminal of each appliance they connect to;

3. Recognize the connectors that should be connected to which connector on the electrical device. For vehicles with many electrical equipments, there are many lines on the circuit diagram, causing many difficulties for reading. At present, the international automobile circuit diagrams are popular “longitudinally arranged drawing method”, that is, the main lines are arranged vertically and do not go right angle way (very few excluded), no wire crossings appear on the diagram. For a certain line, it does not exceed 75% of the longitudinal length of the line from beginning to end. Circuits of the same type are confined to one area in the transverse direction of the main line. This provides a concise and straightforward method of reading graphics for a wide variety of automotive circuits.