| Pin Number |
Pin Name |
Description |
| 1 | A1 | SCV - speed-dependent volume control. This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor. Note: If the speedometer stops working when the radio is connected, then the pin is probably grounded because radio probably uses this pin for another function, except for GALA. On some equipment this pin is used, instead, for the rear-view camera control input, which carries the 12v backup-light signal to the head unit to tell it to display video from the backup camera. |
| 2 | A2 | Mute from Cell-Phone. This pin is used to silence the audio cd, earthed by some other external components such as a mobile phone that is connected to the radio. |
| 3 | A3 | the reversing light switch. Satellite navigation uses this signal, the GALA signal (pin 1) and an internal laser gyroscope to calculate position in the absence of satellite signals. +12 V input on the radio with the ignition switched on the ignition and the car is in gear to move backwards. |
| 4 | A4 | Memory Power (12V direct from Battery). Connects the radio directly to the battery. |
| 5 | A5 | Power for Electric Antenna. Output from the stereo +12 V (maximum 150 - 300mA) power supply for automatic or electronic antennas. |
| 6 | A6 | Dial-light illumination (car side light circuit). +12 V input on the car when the lights are on. For some it actually illuminates the radio display - the others can dim the lights. If the dashboard of your car has a light control function, this pin should be connected in order to regulate the brightness. The wire from lighting a cigarette lighter can be used for the same purposes. |
| 7 | A7 | +12V Main Power (Switched via Ignition key). +12 V with the ignition key is in the ACC or ON position. |
| 8 | A8 | Ground (Chassis) |
a4 and a7 pins may be reversed (a4=acc switched, a7=batt fix) in some Head Units, i.e. sony japan. A7 and A4 must be connected to +12V to get radio power on.
Car audio ISO connector B pinout
Connector B is used only for the speakers. Which wire goes to which speaker can be easily determined with a battery of 1.5 V. Speaker will click and you will see the diaphragm move forward or backward. Speakers must be properly phased (note the + and - half on the speaker), because otherwise you will have weak bass. Wire with a stripe usually goes to + pole of speaker.
| Pin Number |
Pin Name |
Description |
| 1 | B1 | Right Rear + |
| 2 | B2 | Right Rear - |
| 3 | B3 | Right Front + |
| 4 | B4 | Right Front - |
| 5 | B5 | Left Front + |
| 6 | B6 | Left Front - |
| 7 | B7 | Left Rear + |
| 8 | B8 | Left Rear - |
Car audio ISO connector C pinout
Connector C are consist of 3 separate connectors that are tied together. It is not always present, sometimes only a part.
| Pin Number |
Pin Name |
Description |
| 1 | C1 | Line out left rear |
| 2 | C2 | Line out right rear |
| 3 | C3 | Line out ground |
| 4 | C4 | Line out front left |
| 5 | C5 | Line out front right |
| 6 | C6 | |
| 7 | C7 | RXD |
| 8 | C8 | TXD |
| 9 | C9 | Chassis ground |
| 10 | C10 | +12v switched - maximum 150mA |
| 11 | C11 | Remote control in |
| 12 | C12 | Remote control ground |
| 13 | C13 | CDC data in (bus) |
| 14 | C14 | CDC data out |
| 15 | C15 | CDC +12v permanent |
| 16 | C16 | CDC +12v switched - maximum 300mA (+A) |
| 17 | C17 | CDC data ground (+U) |
| 18 | C18 | CDC audio frequency ground |
| 19 | C19 | CDC audio frequency left |
| 20 | C20 | CDC audio frequency right |
Warning! The connector wiring may vary depending on the car manufacturer!
Take special care when installing into '98 or later VW/Audi/Skoda/Seat models as there may be a 12 V connection on Pin A5, which could damage the car stereo or into Ford from '97 or later, with an ISO connector, on which damage to the car's microcomputers is possible if misconnected.
Before we move on to a detailed consideration and solution to the question of how to pinout specific models of standard radios on Ford Focus and Nissan cars, and so on, let’s figure out what the concept itself means - pinout and iso.
Pinout
The ISO pinout of the radio connector is a determination of the functionality of the contacts in the plugs or radio components with planar (rectangular cross-section) outputs, now called SMD parts, in accordance with their numbering.
ISO radio connector
Connector head unit car certified according to international (European) standards. Analogue of Russian GOST.
Types car radios according to international classification
All car players can be divided into two types, which are installed by car manufacturers. This:
- 1DIN standard;
- 2DIN standard.
That is, one- and two-block. Cars of European brands prefer single blocks. While Japanese, American and a number of Korean, and now Chinese car brands use the 2DIN standard.
Why do you need to know this?
When purchasing a new or used car, the owner is often not satisfied with the sound quality or other parameters and functions of the radio, either standard or installed by the previous owner. And when you try to independently replace, for example, a car player from JVC with a Pioneer device, in a Ford Focus, you are faced with a situation where all the wires are mixed up or even do not fit the shape of the connectors.
In order to solve this problem, you need to purchase a fairly cheap iso plug, which are sold at any auto parts store. Then carry out the pinout of the head unit connector according to the following recommendations.
Instructions for pinouting (determining the colors and functions of wires) of the head unit in a Ford Focus car, via an ISO standard plug
Due to the different shapes of the contacts of the radio and the ISO connector, adapters are used that are individual for each brand of car radio.
Since all car players are connected via ISO connectors, a rectangular block located behind it (radio), the shape of the plug itself is standard. This European type connector (Euro connector) consists of two plugs, also rectangular in shape. Sometimes there are connectors combined into one block.
The pinout of the radio connector through two Pioneer connectors is as follows:
- Top block:
- Increase/decrease sound volume at speed (wire color can be arbitrary).
- The wire responsible for temporarily muting the sound (MUTE), for example, during a phone call, etc. (also freely colored).
- Empty contact.
- ACC mode (connection to the ignition switch where the plus appears after turning the key and disappears after the ignition is turned off), yellow wire.
- Power supply from 12 volt receiver antenna (blue wire).
- The orange wire controls the backlight of the car 12 player.
- 12 volt auto ignition (red).
- Ground ground, negative potential on-board network, always connected to the car body (wire in black insulation). There is no grounding as such in a car, since it is not a stationary device.
- Bottom block:
- Plus right rear speaker speaker system- purple wire.
- Minus - black and purple.
- Right front, plus - gray wire.
- The right speaker (front) minus is black and gray.
- Left front speaker, plus - white, minus - black and white. The wire.
- Rear speakers (plus and minus), green and black, green.
Nissan car radio
The pinout of the Nissan radio connector is made through plugs of the European ISO standard, according to the same diagram and sequence as given above. With minor additions from the manufacturer. Namely.
In Nissan car players, the negative wire, in addition to the main color, may have a narrow stripe, black.
The yellow and red wires are often combined, which allows you to play music on the radio without turning on the car's ignition. Moreover, the sound quality even improves.
The wires themselves play a big role in the operation of the car's receiver. Manufacturers, in order to save money, usually use wire that is not of the best quality.
JVC radio
The pinout of the JVC radio connector is completely similar to the Euro connectors. Unlike Nissan, it does not have even minor differences.
If you do not quite understand the working pinout diagrams of a car radio or are not sure of the correctness of your actions, it is better to seek help from a professional auto electrician at any technical service center.
- a simple matter that any car enthusiast can handle. But sometimes the installation procedure raises questions related to connecting the device. Then an adapter for the radio comes to the rescue. Read more about markings, types and pinouts below.
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Markings and types of connectors
Today, all car radio connectors comply with the ISO standard, and two connectors are used. Each is a plug with eight pins, sometimes the manufacturer can combine them into a single housing. Energy consumption sources are connected to one of them; it is marked with the letter A. As for the second, acoustics, that is, speakers, are connected to it. The connector designation is marked with the letter B.
Head units with three outputs can be found on sale, but they are rare and usually represent an exception.
Even if the connected sockets do not correspond to each other, the car owner has several connection options:
- You buy a special adapter for the radio, which can be connected to the outputs of the speaker system.
- The second method is considered “collective farm” among car enthusiasts. Its essence is to cut off the non-standard output and wind the necessary wires to it. But we do not recommend using this option, because eventually the wires will begin to unwind, so the “collective farm” procedure will have to be repeated. In addition, the cost of adapters is not so high to use this method.
Pinout of a standard Euro connector
What does a car owner need to know about the pinout of the Euro connector? Let's look at the notation using output 10478 as an example.
Upper power connector "A"
As already reported, this output is intended for connecting power supplies to the electrical circuit of the vehicle.
And although the device is equipped with eight contacts, all of them can not be used to connect the head unit. But these contacts would not exist if they did not perform certain functions. The first three outputs, as well as the sixth, are rarely used, especially for connecting budget device options. Typically, their use is due to the need to connect additional functionality, and we are talking about more advanced car radios. Please note that contact colors may vary.
If we talk about additional options, we mean:
- ANT output. This pin is used if the vehicle is equipped with a retractable antenna.
- Remote function, thanks to which external amplifiers can be connected to the head unit. This will increase the number of connected speakers. This is relevant for music lovers and owners of vehicles with a large interior, which, with proper installation of the speakers, will increase the sound quality.
- Illumination function. This option is for automatic change brightness and color parameters of the head unit display. If the car is moving at high speed, then the screen brightness will decrease so that the system does not distract the driver from driving the car. When the vehicle stops, the radio will return to the initial settings.
- Mute function. Today, many head units have this option. But this option can be activated either by clicking on the corresponding button or automatically. In particular, if an impulse from mobile device, the system will automatically lower the volume so that the driver can talk on the phone without being distracted from driving.
Connectors for radios from different brands The fourth contact is responsible for powering the vehicle's audio system. The wire from it must be connected to and powered from the battery, but a fuse must also be used for this. This method of connecting the wiring will protect the battery from discharge, since activation of the head unit is possible after the key is turned in the ignition.
The fifth contact is for connecting the antenna wire. As for the seventh contact, it is important because it is responsible for powering the volatile memory of the head unit. That is, if it accidentally turns off, it will reset all . It’s unlikely that anyone will like losing all the parameters after setting it up.
It is necessary that each of the power cables be protected by a fuse for safety purposes. If malfunctions sometimes occur in the operation of the audio system, it is advisable to install a capacitor between the seventh and eighth outputs. As for the capacitor capacity, this parameter must be selected individually. The capacitor performs a filtering function, that is, the element is designed to smooth out various fluctuations in the on-board network.
Bottom speaker connector "B"
As mentioned earlier, speakers are connected to output B.
As for the pinout of contacts, their designation is as follows:
| 1 | Plus for rear right speaker | Indicated in lilac color |
| 2 | Minus for him | Lilac-black |
| 3 | Positive output for the right front speaker | Indicated in gray |
| 4 | Minus for the same speaker | Indicated by gray and black colors |
| 5 | Positive output for front left speaker | White contact |
| 6 | Negative output for the same column | Black and white color |
| 7 | Positive contact for rear left column | Indicated in green |
| 8 | Minus output for her | Black-green |
Most head units are designed to work with four speakers; eight wires are used for this, two for each speaker. Note that the quality of the audio track determines correct connection plus and minus. If the flattening is mixed up, nothing will happen, but the car radio will function abnormally, and the sound quality will not be as good.
If you are the owner of a car with a radio that only plays cassettes, do not rush to buy a new audio system with a USB output. Today you can find such a device as a cassette adapter for a car radio. It looks like a cable cassette and is simply inserted into the connector. The cable connector is connected to mobile phone or player, and you can listen to music in digital format.
Video “Analysis of the Euro chip of a car radio”
Power connector:1 - B+ or BAT or K30 or Bup+ or B/Up or B-UP or MEM +12 = Battery powered.
2 - GND or GROUND or K31 or simply Minus is indicated = Common wire (Ground).
3 - A+ or ACC or KL 15 or S-K or S-kont or SAFE or SWA = Power is supplied from the ignition switch.
4 - N/C or n/c or N/A = No contact. (Physically the output is there but not connected anywhere).
5 - ILL or LAMP or Sun symbol or 15b or Lume or iLLUM or K1.58b = Panel illumination. +12 volts are supplied to the contact when the side lights are turned on. Some radios have two wires, -iLL+ and iLL-. The negative wire is galvanically isolated from ground.
6 - Ant or ANT+ or AutoAnt or P.ANT = After turning on the radio, +12 volts are supplied from this contact to control the retractable antenna (Mercedes) or to the active one for others (not always).
7 - MUTE or Mut or mu or Image of a crossed out speaker or TEL or TEL MUTE = Input to mute the sound when receiving a telephone call.
8 - GALA or GAL = Speed sensor input. Automatic adjustment sound level (increase) with increasing vehicle speed (a more modern sound compression function is used in PIONEER DEH 945R radio tape recorders; the radio tape recorder has a measuring microphone).
Speaker connector:
1 - R = Right speaker.
2 - L = Left speaker.
3 - FR+, FR- or RF+, RF- = Front speaker - right (plus or minus, respectively).
4 - FL+, FL- or LF+, LF- = Front speaker - left (plus or minus, respectively).
5 - RR+, RR- = Rear speaker - right (plus or minus, respectively).
6 - LR+, LR- or RL+, RL- = Rear speaker - left (plus or minus, respectively).
7 - GND SP = Speaker common.
Other contacts:
1 - Amp = External amplifier power-on control pin
2 - DATA IN = Data input
3 - DATA OUT = Data output
4 - Line Out = Line Out
5 - CL = ???
6 - REM or REMOTE CONTROL = Control voltage (Subwoofer, Amplifier)
7 - ACP+, ACP- = Bus lines (Ford)
8 - CAN-L = CAN bus line
9 - CAN-H = CAN bus line
10-K-BUS = Bidirectional serial bus (K-line)
11-SHIELD = Shielded wire braid connection.
12-AUDIO COM or R COM, L COM = Input or output common (ground) preamplifiers
13-ATX+ = ???
14-ATX-MUT = ???
15-CD-IN L+, CD-IN L-, CD-IN R+, CD-IN R- = Balanced linear audio signal inputs from the changer
16-SW+B = Switches power supply to +B battery.
17-NAVI = ???
18-SEC IN = Second input
19-DIMMER = Change display brightness
20-ALARM = Connecting alarm contacts for the radio to perform car security functions (PIONEER radios)
21-ASC IN and ASC OUT = ???
22-SDA, SCL, MRQ = Interchange buses with vehicle display.
23-SDV or SDVC = ???
24-SWC = ???
25-LINE OUT, LINE IN = Line output and input, respectively.
26-TIS = ???
27-D2B+, D2B- = Optical audio link
28-BRAKE = Connects to the handbrake. If you put it on ground, you can watch the video while moving.
FORD FX3000 MADE IN KOREA BY INTERCONTI A94 SX 18 C 8122 AA
FORD SOUND 2000 
FORD 2006 RDS (Portugal)FORD 4500 (made in Brazil)FORD 5000 RDS (Portugal) part no. 96AP-18K876-CC FORD 7000 RDS (Portugal) part no. 95GB-18K876-BA 
FORD 5000 RDS EON (Portugal) part no. 98AP-18K876-BC 
FORD 3000, FORD 4000 (Type of connector) 
FORD 5000, FORD 6000, FORD 7000 (Type of connector) 
FORD 6000 CD 
FORD 6000CD (7S7T) 
FORD Mondeo, Galaxy, Mazda, Ford CD MP3 
FORD 2006 R (VW SHARAN, FORD GALAXY)
95VW-18K876-JB FDZ7R2WM059374 Made In Portugal 
FORD Windstar 
FORD 1998 - 1999 model year. 
FORD 2007 RDS. 
FORD E-STR 22DPS710
A91SX-18K876-EA (INTERCONTI) 
FORD 2007 RDS 94FP-18K876-HA (Without internal bass amplifier)
FORD 2007 SOUND2 RDS VWZ7Z3 (Without internal bass amplifier) 
FORD 2500 (4S61-18K876-BA) FORD 3500 (4S61-18K876-BA)
FORD 4500 (2S61-18C815-AF) FORD 4500 (4S61-18C815-AA)
FORD 6006E CD RDS EON (1S7F-18C815-AD) VISTEON 
FORD 6000 MNE MP3 
FORD 5000C 
FORD F57F-18C852-BE (made in Mexico) 
FORD YL1F-18C870-JA (made in Mexico) 
FORD Radio Navigation System BP1422 (Germany)
FORD 2028 (89GB-19B160-AA) Made In Japan
PRODUCED BY SONY CORPORATION
The radio does not have its own power amplifiers 
FORD 2008 RDS Made in Portugal 
FORD 1L2F-18C868-BB Made in MEXICO 
In most cars, the radio was installed either by the dealership or by the previous owner. If you are unlucky and your car does not have the necessary wiring, then this article is for you. Let's consider connecting the radio from scratch, or after incorrect installation.
Before we start connecting, we will need to purchase (find at home or in the garage):
- two copper wires with a cross section of 2.5-4 sq. mm
- fuse with holder rated 15-20 amperes
- connector for radio connection
If the radio is new, then the connector for connection should be included in the delivery package, but if your head unit was purchased second-hand (inherited, given by friends), then do not worry, you can buy it at any car audio store or at the car market for a nominal fee.
ISO 10487 connector
The figure shows an ISO 10487 connector for connecting a car radio. As you can see, the connector consists of two identical blocks. One block is for power supply and control of the car radio, the other is outputs for the speaker system. The pads differ from each other only in color and number of wires (rarely). The pinout of the connector is shown in the figure below, and the description and color of the wires are on the plate.
ISO 10487 connector pinout
ISO Audio - connector for connecting a car's speaker system
ISO Power - connector for connecting power and control wires
ISO Audio
ISO Power
If everything is more or less clear with the connection of the audio block, then it is better to consider the connection of the radio power supply in more detail. For the most easy connection The radio will only need three contacts on the power supply: 4, 7, 8.
- The 4th contact is a permanent plus, it is also the memory of the radio. This contact is responsible for operating the device’s memory and saving settings.
- 7th contact - power supply to the radio. Must be connected to the wire that receives power in the ACC position of the ignition switch. Unfortunately, on domestic cars there is no such position of the lock, so the 7th contact is connected either directly to the battery (like the 4th) or to the wire on which 12 volts appears when the ignition is turned on.
- Pin 8 is the negative power supply wire of the device. It is advisable to connect directly to the battery negative.
It is recommended to connect the 4th and 8th contacts of the power supply directly to the plus and minus of the battery, respectively, preferably with a copper wire with a cross-section of 2.5-4 sq. mm. A fuse of 15-20 must be installed on the positive wire at a distance of 10-20 cm from the battery terminal, this will avoid damage to the head unit when there is a jump in the car’s on-board network. The 7th pin is usually connected together with the 4th to the battery directly or to any wire from the ignition switch on which +12 appears.
At this point, you can finish connecting the radio if you do not need to control the backlight and additional devices. If you need the function of controlling the backlight of the radio (increasing or decreasing the brightness depending on turning the side lights on/off), then you need to connect the 6th pin of the power supply to the wire going either to the cigarette lighter backlight or to the side lights. If you need to turn on an external antenna or amplifier, an external equalizer or CD changer, monitor or other device together with the radio, you must use the 5th pin. The blue wire of the power supply connects to the control wire required device and it will only be activated when the radio is turned on.
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