Connectors for car audio

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Several types of connectors for car audio systems are used.

ISO 10487[edit]

ISO 10487 connector in car, fits into head unit





Power (A)[edit]


  • Pin 2 is optional; used for phone mute
  • Pin 6 is optional; used for vehicle instrument illumination

Loudspeaker (B)[edit]


Miscellaneous (C)[edit]

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
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)
15) +12v permanent (out) 18) audio ground
14) data out 17) data ground 20) audio right


Navigation (D)[edit]



From 2000 and onwards, manufacturers, such as BMW, Citroen, Ford, Mercedes Benz, Peugeot, Volkswagen, Rover, Audi, Seat, Opel and Škoda have sometimes 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, the pin allocation is not entirely the same, and the connector housing is not compatible. In addition to the 16 pins, like ISO 10487, there are minor connectors for optional equipment. They fit within the frame of the main connector, and has coding so that they cannot be interchanged. Minor connector B has 12 pins for audio output signals. Minor connector C has 12 pins for various audio sources such as CD-changers, MP3 players.

Quadlock A
1) right rear + 5) right rear - 9) I-bus (BMW) 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 battery

See also[edit]

External links[edit]