Pinout of car radio connectors according to the European ISO standard (ISO)

Markings and types of connectors

To answer your silent question about what kind of connectors there are in car radios, I must answer that most modern car radios are equipped with two standard connectors, designated by the abbreviation “ISO”. Each of these connectors is designed as an eight-pin rectangular plug, sometimes they are combined into one housing (see photo).

Car radio ISO connector pinout

One of the connectors carries “power” circuits, that is, current consumption sources are connected to it, and is designated in the diagrams as a connector under the letter “A” and is colored brown. The second connector is intended for connecting the car’s acoustic system, in other words, speakers. Unlike the previous one, it is made in black and is designated on electrical circuit diagrams as connector “B”.

What connectors do car radios have?

Sometimes there are car radios with three connectors, but this is the exception rather than the rule. The same exception as non-standard connectors, which still have wiring with standard markings and in any case allow you to connect the wires of a standard speaker system with non-standard “connections” in at least two ways. So:

• “Skolkhoz”, namely, cut off the non-standard plug and overlap the wires, which “is not very good”, since over time the twist will become loose due to oxidation/shaking and, in the best case, you will have to do all the work again while simultaneously replacing the fuses.

Pinout of ISO connectors for car radios

• Buy an adapter (the price of which is in no way close to the amount of work that the method described above includes) and, without any problems, decorously/nobly, connect the car radio with other elements of the acoustic circuit of your car.

The choice of adapters at the moment is huge, and it is simply physically impossible for any troubles to arise in the use of this variety.

Car radio ISO connector pinout

Features of ISO connectors

Having a single ISO connector standard (electrical characteristics), many automakers, as well as audio equipment companies, can change its external shape at their discretion. That is, if you decide to replace an outdated Hyundai radio with a Mystery multimedia system, first of all, pay attention to the matching iso connection formats.

Also, when installing equipment, you can quite often encounter slight changes in the pinout colors of electrical cords from the standard pinout. Next, we will provide visual descriptions of the pinout of the ISO connector of a standard sample and for individual brands of sound-reproducing equipment (pinout of the ISO connector of the Prology 1715t radio, etc.). Judge for yourself how different they are from each other.

An alternative to ISO connectors are Fakra connections.

Pinout of a standard Euro connector

Let's look at the pinout of the Euro connector on a standard ISO plug - 10478

Upper power connector “A”

As already mentioned, this plug connects the sources and consumers of electrical current from the vehicle’s on-board network.

Despite the fact that it has eight contacts, not all of them can be used in the car radio connection circuit. Let's figure out what the purpose is and what task each of these contacts performs:

• Connectors No. 1, No. 2, No. 3 and No. 6 are rarely used by default in the circuit of a budget car radio. Most often they are used to connect additional functions in more professional versions of the head unit, which significantly increase the comfort of a modern car, while the colors of the wires can be made in various color variations.

For example, among the additional functionality we can highlight the following:

1. “ANT” output, which is used in cases where a retractable automatic antenna is installed in the car;
2. “REMOTE”, which allows you to connect external amplifiers to the car radio, which means increasing the number of connected speakers (relevant for cars with a large interior, since in a small interior a large number of speakers creates a large load on the hearing organs, which is fraught with negative consequences);
3. the “ILLUMINATION” option, which automatically, depending on the speed of the vehicle, controls the light signaling of the car radio - at higher speeds, the brightness of the display decreases and does not distract the driver from the process of driving the vehicle; when the vehicle stops, it returns to its initial parameters, which significantly the extent to which it affects road safety;
4. as well as the currently very common “MUTE” option, which is turned on when using a mobile device connected to the car’s speaker system - when a receive/call signal passes through, the car radio automatically activates this output, which leads to a decrease in the volume of the music being played or to a complete shutdown car radio sound;

• Contact number four (indicated on electrical diagrams as “A4”) is responsible for turning on the entire acoustic system of the car. Through a separate fuse, this yellow wire is connected to the ignition switch terminal and is already powered from the battery.

Organizing the connection of the car radio according to this scheme is guaranteed to protect the battery from unauthorized discharge, since turning on the car radio is possible only when the key is turned in the ignition switch.

Reference. The need for this kind of connection arose due to the fact that the cascades of the car audio system continue to consume electrical energy even when turned off, which very often led to battery discharge.

Domestic car enthusiasts have improved the wiring diagrams for car radios as best they can, resorting to both manual toggle switches and installing an automatic relay to turn off the radio when setting the car alarm. But, as we see, it is this connection scheme that has received universal recognition. So:

• The fifth wire (A5), blue, is responsible for connecting the car antenna. It is designed for a maximum output current of 300 microamps, and if this value is exceeded, a large current can damage not only the output amplifier stages, but also the car radio itself as a whole;
• The contact with the positional designation “A7” in red is responsible for delivering voltage to the volatile memory of the car radio. This means that if you accidentally turn it off, all device parameters will be reset/reset to factory settings. The voltage on this wire is 12 volts;
• Well, the last wire of this connector, running in black insulation (A8), as you probably already guessed, is responsible for connecting the device to the ground of the car.

Advice! In order to protect the acoustic circuit, each of the supply wires must be equipped with a fuse-link. If periodic interruptions still occur during the operation of the head unit, then it is recommended to install a capacitor between contacts “A7” and “A8”, the capacity of which is selected experimentally. Essentially, it (the capacitor) will serve as a filter that will smooth out fluctuations in the electrical power circuit of the car's speaker system.

Bottom acoustic connector “B”

As already mentioned, all other peripherals of the car audio system, that is, speakers, are connected through connector “B”. The pinout of the car radio Euro connector under the letter “B” looks like this (see previous photo):

The main part of car radios is initially designed to connect four channels, for which eight wires are used (two for each speaker).

Attention! The correct channel polarization plays an important role in the sound quality of your speaker system. Of course, if you mix up the wires and connect the speaker incorrectly, nothing bad will happen to it, but the entire speaker system will begin to work in abnormal mode - an incorrectly connected speaker will work in antiphase and the entire sound “collage” will be ruined.

DIY car radio ISO connector pinout

Advice! Elements of the car's acoustic system must be connected with wires having a minimum cross-section of 1.5-2 millimeters. In this case, wires with the largest cross-section must be used on power lines; wires with a smaller cross-section are not allowed, as this can not only spoil the sound, but can also lead to a complete failure of the entire system as a whole.

This information allows you to understand the very basis of the pinout of Euro connectors in modern car radios, which allows you to install almost any acoustic device in almost any car, without having any special knowledge. But you should also not forget about caution, especially when you are dealing with non-standard connectors and equipment/vehicles that have long been out of production, and even more so when they are used. For “complex” connections, I strongly recommend that you use testers and a multimeter for “testing” electrical circuits and subsequent “switching”.

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How to properly connect to an electronic device

The concept of an interface as we know it today dates back to the 1960s. More precisely, in 1964, when the company developed its legendary IBM System/360 mainframe. It was then that the main tasks of any interface - physical or virtual - were formulated. They were to provide a standard connection for all devices.

Euro connectors

Initially, only a few types of standard inputs could be made to ensure compatibility between products from different manufacturers. This was a PS/2 port for the keyboard, an LPT port for the printer, and a connector for the PCI card. Nowadays, each type of connection has its own standard interface; this approach greatly simplifies the development and sale of any type of device and allows you to understand their built-in capabilities. Here are descriptions of the main communication elements, first of all, the designation of the button on the radio, which are used on the panels of Pioneer and other car radios.

Description of the buttons on the front panel of the radio for control (decoding)

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Comments 25

I have a similar problem. I called that there is constant power on pin 7, and after the ignition on pin 4. After turning off the ignition, there is no reset? The radio works as expected. What's wrong?

ps stock radio for Ford Galaxy 1999.

This means that the standard radio has a suitable pinout. A similar situation happened with Pioneer radios, when it was necessary to swap the red and yellow wires. Manufacturers of radio tape recorders provide this opportunity, implementing this in additional features. contacts on the cable

It is interesting that the ISO 10487 Standard itself defines the physical parameters of connectors for connecting an audio radio to a car. But it does not determine the purpose of the contacts! So says Wikipedia.

Heh. AND? Did someone connect it incorrectly?