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Connectors for car audio

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Several types of connectors for car audio systems is used.

Contents

ISO 10487

ISO 10487 connector in car, fits into head unit

ISO 10487 defines a standard for connectors for the head unit to the car's electrical system, consisting of a system of four different connectors typically used in head units for car audio.

Power (A)

The first connector A is always present, is usually black in colour, and contains pins for power-supply, off/on (typically controlled by ignition key), optionally motorised antenna and so on. Pinout viewed from the cable side of the female connector:

A
clip 1) speed signal [2] 3) N/C [4] 5) remote antenna (out) 7) +12 V switched [1]
2) phone mute [3] 4) +12 V battery [1] 6) illumination [5] 8) ground

 [1] On some cars the +12V Ignition and Battery positions are reversed, such as later Volkswagen group cars, Peugeot 106, Vauxhall Astra, Citroën C3.
 [2] Optional, used for speed dependent volume control and possibly navigation.
 [3] Optional. Used for reversing lamp signal on Becker radios with navigation.
 [4] Also used for telephone mute (Becker)
 [5] Optional, vehicle instrument illumination

Loudspeaker (B)

The second connector B is for connecting loudspeakers, and is usually brown in colour. Pinout viewed from the cable side of the female connector:

B
clip 1) right rear (+) 3) right front (+) 5) left front (+) 7) left rear (+)
2) right rear (−) 4) right front (−) 6) left front (−) 8) left rear (−)

Miscellaneous (C)

The connector C is optional. Some times, it appears as one 20-pin connector, often red in colour, or it may be divided into three separate connectors which may be hooked together, in which case C1 is usually yellow, C2 is usually green which C3 is usually blue in colour. The contact spacing is narrower than the other connectors, so the C connector is sometimes referred to as mini-ISO.

C1 (external amplifier)
1) line out left rear 4) line out left front
3) line out common ground 6) +12V switched (out)
2) line out right rear 5) line out right front
C2 (remote control)
7) receive data 10) +12V switched (out)
9) chassis ground 12) remote control ground
8) transmit data 11) remote control in
C3 (CD changer)
13) data in (bus) 16) +12v switched (out) 19) audio left
15) +12v permanent (out) 18) audio ground
14) data out 17) data ground 20) audio right

Navigation (D)

The connector D is only used for satellite navigation systems, and has 10 pins.

Quadlock

From 2000 and onwards, manufacturers, such as BMW, Citroen, Ford, Mercedes Benz, Peugeot, Volkswagen, Rover, Audi, Seat, Opel and Skoda have started using a 40 pin connector instead, called the Quadlock (or Fakra, after the manufacturer). The Quadlock connector consists of a block of 16 flat pins analogous to the two main ISO 10487 connectors. While the physical contact pins are the same as for ISO 10487, the pin allocation is not entirely the same, and the connector housing is not compatible. In addition to the 16 pins, there are two 12 pin minor connectors for optional equipment. Minor connector B has audio output signals. Minor connector C has signals for various audio sources such as CD-changers, MP3 players.

Quadlock A
1) right rear + 5) right rear - 9) I-bus 13) antenna (out)
2) right front + 6) right front - 10) phone mute 14) illumination
3) left front + 7) left front - 11) tel on 15) 12V dir.
4) left rear + 8) left rear - 12) ground 16) 12V acc.

See also

External links

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