How to draw auto wiring harness diagram? Aug 18, 2023

How to draw auto wiring harness diagram?

Solution 1:

Here's how:

According to the vehicle wiring harness configuration list, the wiring harness direction in the 3D wiring diagram, using the measuring tool in CATIA, according to the drawing requirements of the wiring harness diagram, measure the required sizes of each trunk, branch, buckle, cable tie, rubber parts, etc., and arrange the 2D diagram through reasonable design, the outline of the wiring harness diagram can be basically determined. As shown in the figure, the door wiring harness of an SUV model of an automobile manufacturer is a 2D wiring harness diagram converted from the 3D wiring diagram. Combined with the various technical documents provided by the main engine factory, determine the model, location and function of the sheath in the drawing, determine the model and schematic diagram of the cable tie, buckle and rubber parts, and improve the details of the drawing.



Solution 2:

In the process of automobile circuit design, in order to understand the actual situation of automobile electrical appliances in detail and facilitate the arrangement and connection of automobile circuits, it is necessary to use the principle block diagram, automobile circuit diagram and application diagram. Although the diagram reflects the actual installation position of the electrical equipment on the car, the wires on the diagram are crisscrossed, which increases the difficulty of reading the diagram. In order to make the circuit diagram closer to the reality, it is often necessary to draw the wiring harness installation diagram.

Wiring harness diagram is based on the actual installation of electrical equipment in the car to draw the whole car circuit diagram, mainly based on the formation of wiring harness, the drawing surface of the line is less, the expression of the connection between the components has become its main content, in order to express the color of the wire, the terminal code of the joint, often supplemented by wiring harness grouping and terminal number table and wiring harness terminal wiring table.

The contents of the harness

One, the composition of the wire harness

The automobile wiring harness diagram is composed of multiple wiring harnesses, including main line harnesses and branch harnesses. The diagram should show the composition of each wire harness, how many branches on each wire harness, how many wires on each branch, the color of the wire and what the stripes are.

Two, the length of the harness

The length of the harness includes the total length of the harness, the length of each branch, and the length of the interval between two wire ends.

Three, wiring code and wiring mark

The number of electrical appliances on the car is large and complex, in order to make the connection correct, each connection point should be marked with the wiring code and wiring mark, so as to facilitate the connection.

Four, the connector

Since there are multiple wiring harnesses, wiring harnesses and wiring harnesses, branches and wiring harnesses, or branches and electrical appliances are connected through the connector, it should be indicated that there are several wires on each connector, what position each wire is located in the connector wiring hole, what shape the connector is, and whether the adjacent connectors are easy to confuse.

Conductor color

In order to let you better understand the division of the color of the wire in the car wiring harness diagram, first introduce a few terminology.

Main color: the color with a large area proportion in the two-color conductor.

Auxiliary color: color with small area proportion in two-color wire.

Monochrome wire: wire with one color insulating surface.

Two-color conductor: conductor with two colors of insulating surface.

In drawing the wiring harness diagram of the car, the color and code of the wire should conform to the following table:


In this way, in the automobile wiring harness diagram, the color of the monochromatic wire is composed of a color specified in the above table, and the color of the two-color wire is composed of the two colors specified in the above table. Its color labeling also has rules, all use color code, if the monochrome wire, the color is red, marked as "R"; If the two-color wire, the first color is the primary color, the second color is the auxiliary color, the main color is red, the auxiliary color is white, and the label is "RW". In this way, the color of the wiring harness wire is clearly expressed on the wiring harness diagram, which is easy for designers to consult.

In addition, all kinds of car electrical wiring should be used black wire, black wire in addition to the use of iron, no other purposes.

Traverse area

The cross-sectional area of the wire is selected according to the size of the working current. For some electrical appliances with particularly small current, such as indicator circuits, in order to ensure the due mechanical strength, the cross-sectional area of the wire shall not be less than 0.5mm2.

The cross-sectional area of a conductor is marked in front of the color code and is not marked when the unit is mm. For example, 1.25r indicates a red conductor with a cross-sectional area of 1.25mm2. 1.0G/Y indicates a two-color conductor with a cross-sectional area of 1.0 mm2. The primary color is green and the secondary color is yellow.

One of the principles of automobile wiring harness drawing is simple and clear, so that the expression of all aspects of the whole drawing is close to reality, and the applicability of the use and maintenance personnel is strong.

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