VW radio ISO plug connections

Cause of many askings about the original pin assignment of the VW radio plug i created this info page.
This assignment is suitable for VW Lupo, Polo, Golf 4, Bora, Passat 3B/G and other models of these years.

The following picture shows the top view of the ISO plug and the numbering of the pins. These numbers are also imprinted on the plug (where i inserted the numbers).

The assignment:

Pin numberCable colorAssignment
1blue/whiteGALA signal (speed)
2green/whiteMute (for telephone)
3gray/whiteDiagnostic (K-Line)
4yellow/red (or brown/red)Ignition positive
5red/whiteSAFE positive (only for OEM stereo)
6gray/blueLight positive
7red/whiteMemory (backup)

Some cables may not be available. It differs from extra equipment.
The first part of the cable color is the main color, the second part the thinner line on the cable.

The SAFE pin is a second memory cable. Be careful if you connect a new radio.
Also note that your new car radio does not connect to the K-Line pin. Otherwise you will get some serious errors in your car.

Note that aftermarket stereo may have some different assignment, especially memory and ignition cables. Some manufacturers give the option to swap these 2 cables.

Here are 2 extra pictures from the back.

Detail view 1
Detail view 2

I can not guarantee the correctness, but i gave my best.

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2 Responses

  1. georg römer says:

    hallo guten tag, ich habe einen cd player, kein cd wechsler fuer vw golf 4. beta 5 autoradio. die kabel sind durgetrennt, es sind 8 kabel braun, grau ,schwarz, weiss, blau, gruen, gelb, rot. wie werden die auf den mini isostecker mit 5 pins belegt anordnung der farben wollte ich wissen. die belegung anschluss cd autoradio ist 13-16-19-15-16-14-17-20. auf welche zahl kommt jetzt zb. rot auf 13, schwarz auf 16. welches kabel vom cd player auf welche zahl das wäre meine frage. bitte fuer gute tipps bin ich dankbar. m..f.g

    • Rene says:


      Pin 13 – braun
      Pin 14 – grau
      Pin 15 – blau
      Pin 16 – schwarz
      Pin 17 – gelb
      Pin 18 – grün
      Pin 19 – weiß
      Pin 20 – rot

      Angaben ohne Gewähr!

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