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PC9 404 - Wires dont match up?

Discussion in 'In-Car Entertainment' started by Allen, Sep 9, 2010.

  1. Allen
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    Allen Member

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    [Sep 9, 2010]
    Dont know if i ordered the right one but the wires dont match fitting after market head unit?

    As you can see...

    [​IMG]



    Any ideas?
    #1
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  3. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Sep 9, 2010]
    You only need to use 3 of the wires, earth, perm live and switched live. The others aren't used.
    #2
  4. Allen
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    Allen Member

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    [Sep 9, 2010]
    Cheers, but which is which?

    The pins dont match where the wire go though
    #3
  5. b1gdave83
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    b1gdave83 Member

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    [Sep 9, 2010]
    Multimeter will sort that problem out
    #4
  6. Allen
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    Allen Member

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    [Sep 9, 2010]
    I've tried them in different combos but still now power?...
    #5
  7. Allen
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    Allen Member

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    [Sep 9, 2010]
    Think got it sussed apart from the switch live. Which is that?
    #6
  8. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Sep 9, 2010]
    On the Audi loom:
    Pin 8 - Earth
    Pin 7 Perm live
    Pin 4 switched live

    Standard ISO layout
    Pin 8 - Earth
    Pin 7 switched live
    Pin 4 perm live

    So the adapter should swap 4 & 7 as Audi wire them back to front.
    However if your Audi is 2000+ then you won't have a switched live on the Audi loom as Audi changed to CANBUS to control this function. So you either pair it with perm live and rely on switching the HU on/off manually or you need to wire one in from the fusebox. The fuse you need is Radio S-Kont.
    #7
  9. Allen
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    Allen Member

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    [Sep 10, 2010]
    Great. Thanks.

    Next issue is rear speakers are not working?
    #8
  10. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Sep 10, 2010]
    Rear speakers are separately amped. You need to use the other part of the PC9-404 adapter to link the rear RCA's on the HU to the 20 pin mini ISO connector on the Audi loom, then connect the flying lead on the same adapter to the power antenna lead on the new HU
    #9
  11. Allen
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    Allen Member

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    [Sep 10, 2010]
    All done!! And rear speakers working.

    Just have to turn off by HU and not ignition which is no big deal. Might put switch live in at some point.

    Thanks again for you help
    #10

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