Printed/Integrated Circuits

Printed circuits or circuit boards are insulated boards approximately 1/16 (25 mm) thick that are designed to hold electronic components such as microprocessors and their associated components. Conductive tracks on the surface of the printed circuits connect the leads of the electronic components to each other to form complex circuits. Printed circuit boards can be very complex with many high-density integrated circuit components installed. Many boards have more than one layer of conductive tracks. They often have two layers and as many as 16 to accommodate the complex circuitry required to connect many integrated circuits.

Technician Tip

Modern vehicles have many electrical components, wiring connectors, and wires. To work on vehicles, you need an understanding of how all the components are assembled together and arranged in circuits. Electrical symbols and circuit diagrams are a way to provide this information in a logical way that represents the physical wiring harness and components attached to vehicles. Every electrical device and component has a corresponding electrical symbol. Many of the symbols are standardized and used universally by manufacturers, although in some cases, variations may exist. Manufacturers’ diagrams and manuals contain keys to identifying the various symbols used and their meaning.