Where is the circuit board located in a car?

[OAmy]

Circuit boards refer to the computers in modern vehicles. Contemporary cars contain numerous computers, ranging from as few as 3-4 to as many as 4510, installed in various parts of the vehicle body. Below is relevant information about circuit boards: 1. Circuit Boards Circuit boards are also known by various names: ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, printed wiring boards, PCB boards, aluminum substrate boards, high-frequency boards, thick copper boards, impedance boards, PCBs, ultra-thin printed wiring boards, ultra-thin circuit boards, printed (copper etching technology) circuit boards, etc. Circuit boards enable circuit miniaturization and visualization, playing a crucial role in the mass production of fixed circuits and the optimization of electrical appliance layouts. 2. Classification Printed wiring boards are categorized by the number of layers into three main types: single-sided boards, double-sided boards, and multi-layer boards. First, single-sided boards: on the most basic PCBs, components are concentrated on one side, while the wiring is on the other side. Since the wiring appears only on one side, these PCBs are called single-sided boards. Single-sided boards are usually simple to manufacture and low-cost, but their drawback is that they cannot be used for overly complex products. Double-sided boards are an extension of single-sided boards. When single-layer wiring cannot meet the needs of electronic products, double-sided boards are used. Both sides have copper cladding and wiring, and vias can be used to connect the circuits between the two layers, forming the required network connections. Multi-layer boards are printed boards with three or more conductive graphic layers separated by insulating materials and laminated together, with the conductive graphics interconnected as required. Multi-layer printed wiring boards are the result of the development of electronic information technology towards high speed, multifunction, large capacity, small size, thinness, and lightweight. Printed wiring boards can also be classified by characteristics into flexible boards (FPC), rigid boards (PCB), and rigid-flex boards (FPCB).

[DeGeorge]

I've always been curious about where a car's circuit boards are actually hidden, and in reality, their location varies by vehicle. The most common spot is in the engine compartment, tucked behind a plastic cover under the hood—that’s usually the main computer board controlling the engine. Some cars place it under the front passenger seat or behind the glove compartment, making it easier for engineers to access wiring for inspections. Then there are smaller circuit boards inside door panels, controlling windows and locks. The trunk may also house circuit boards, such as those for amplifiers or audio systems. Why this design? Primarily for waterproofing, heat resistance, and protection against dust. When repairing cars, I often encounter circuit board failures in these hidden spots, requiring careful panel removal during inspection. Don’t attempt DIY fixes—incorrect handling could damage other components, so it’s safer to consult a professional.

[GiannaRose]

Having driven for several years, I have some understanding of the locations of circuit boards. Generally, the main circuit board that controls the vehicle's 'brain' is located under the hood, usually near the ECU, which is protected by a metal casing. Inside the car, there are also many circuit boards behind the dashboard, responsible for controlling lights and displays. Smaller ones are hidden in the door panels or under the seats. The placement is designed with safety and space utilization in mind, such as avoiding impacts or high temperatures. If you notice electronic functions failing, it might be due to circuit board contact issues. I once experienced uncontrollable wipers and found out later that the door panel circuit had come loose. Avoid parking in damp environments for too long, as circuit boards are prone to corrosion. Always disconnect the power during repairs to ensure the battery connection is off.

[DiOwen]

Talking about the location of automotive circuit boards is quite interesting. In most cars, the main control board is located in the engine compartment, near the area below the windshield. Some are positioned behind the dashboard, and removing the dashboard reveals a cluster of wires connected to the board. The location varies significantly depending on the car model; SUVs might have it placed in a corner of the trunk. During design, it's crucial to protect the board from vibrations and heat sources. I once modified my car's audio system and found an amplifier circuit board in the trunk. It's important to avoid exposing it to dust and to regularly check for loose connection points. Safety first—always consult an expert for circuit modifications, as improper handling can cause short circuits or even fires.