Basic knowledge of automotive wire harness design

In the car, in order to facilitate the installation and protect the wire, many wires in the same way are bundled with cotton yarns or polyvinyl chloride tapes called wire harnesses.

 The harness diagram is a circuit diagram of the entire vehicle drawn based on the actual installation location of the electrical equipment on the vehicle. In the figure, the wires between the parts and components appear in the form of wire harnesses. The wire harness diagram is similar to the wire drawing, but the drawing of the double surface of the drawing is simple and clear, close to reality, and has strong applicability to the use and maintenance personnel.

 The wire harness installation drawing does not describe the wire direction inside the wire harness in detail, only the wire head and the connector outside the exposed wire harness are numbered in detail, and are marked with letters. The representation of the wiring symbol is prominent, which facilitates the wiring. Each terminal is marked with the serial number and color accurately. Harness diagrams are used in combination with circuit diagrams and line drawings to provide great reference value. Therefore, circuit diagrams and wiring harness installation diagrams are generally given in the Hyundai Motor Repair Manual.

2. Drawing of wiring harness installation diagram

 Since the wiring harness installation diagram is mainly formed by the formation of the wiring harness, the drawing surface has fewer lines, and the expression of the connection between the various components becomes its main content. In order to express the color of the wire clearly, the terminal code of the connector often needs to be supplemented by Harness grouping and terminal numbering table and wiring harness terminal wiring table.

(1) Content of the harness 1 Composition of the harness

 The automotive wiring harness consists of a plurality of wiring harnesses, including a main harness and a branch harness. The figure should show the composition of each harness, each branch has several branches, how many lines are on each branch, what is the color and the stripe of the conductor.

  2 wiring code and wiring sign

 The number of electrical appliances on the vehicle is numerous and complex. In order to make the connection correct, each connection point should be marked with a wiring code and a wiring mark in order to facilitate connection. The length of 3 harness

The length of the wire harness includes the total length of the wire harness, the length of each branch, and the length of two wire end spaces.

  4 connector

Since there are multiple harnesses, harnesses and harnesses, branches and harnesses, or branches and electrical appliances are connected by connectors, it should be shown that there are several wires on each connector, each wire is located in the plug What is the location of the connector hole and what the shape of the connector is, and whether several adjacent connectors are confusing.

 (2) Wire color 1 Terminology Single-color wire: A wire with an insulating surface. Two-color conductors: Insulating surfaces are two color conductors. Main color: A large proportion of the area in the two-color wire. Auxiliary color: The color with a small area ratio in the two-color wire. 2 wire color and code