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Fog Light Wiring

Discussion in 'A4/S4 forum(B5 Chassis)' started by ScottD3, Oct 29, 2011.

  1. ScottD3
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    ScottD3 I want your faulty electronics

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    I've been trying to wire in the facelift rear fog lights and having issues.

    I followed this wiring diagram
    [​IMG]

    There is some differences between this foglight control module and mine.
    I a couple of pins missing and a couple of extra pins. Missing pins 15, 17 and one other is missing. Pin 4 is not listed but its on my control unit.
    I worked out which cable does what on the switches and where they go on the control unit, its all pretty much match the colour.
    The problem I got is with the 3-4 thicker cables from the control unit.
    Connected them up as per the diagram but nothing happens. It just drains my battery (which is now flat :().

    Has any one got the wiring diagram for the UK/EU models or know how to do this?
    #1
  2. olds_kool
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    olds_kool Active Member

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    here's how mine was wired for rear only

    control unit connections

    pin 1 white/yellow stripe (thin) not used
    pin 2 grey/white stripe (thick)
    goes to grey/white stripe (thick) of o.e rear fog harness and grey/white stripe (thin) pin 2 rear fog switch
    pin 3 white/yellow stripe (thin) goes to white/yellow stripe (thin) pin 6 rear fog switch
    pin 4 grey (thin) not used
    pin 5 white/green stripe (thick) not used
    pin 6 brown (thick) earth
    pin 7 no wire fitted
    pin 8 grey/green stripe (thick) goes to grey/green stripe o.e rear fog loom and grey/green (thin) pin 4 rear fog switch
    pin 9 black/red stripe (thin) i connected to grey/green stripe of o.e front fog loom but any 12v switched should do???
    pin 10 no connection
    pin 11 no connection
    pin 12 no connection
    pin 13 no wire fitted
    pin 14 yellow/black stripe (thick) not used
    pin 15 no wire fitted


    rear fog switch connections


    pin 1 grey/blue stripe (thin) to grey/blue stripe (thin) o.e rear fog loom (illumination)
    pin 2 to pin 2 control unit above
    pin 3 brown (thin) to brown (thin) o.e rear fog loom (earth)
    pin 4 to pin 8 control unit above
    pin 5 not used
    pin 6 to pin 3 control unit
    Last edited: Oct 30, 2011
    #2
  3. ScottD3
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    ScottD3 I want your faulty electronics

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    Thanks Kev.

    I'll have play tomorrow.
    #3
  4. ScottD3
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    ScottD3 I want your faulty electronics

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    Thanks kev.
    It works a treat now.
    No ideas what the yanks was going on about with their wiring diagram.
    Its all in and ready for the MOT tomorrow.
    #4
  5. Geeman
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    Geeman Low Life

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    You got the fronts working...?
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  6. ScottD3
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    ScottD3 I want your faulty electronics

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    Don't have fronts :(
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  7. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    I threw my fronts away. Pointless things, utilised solely by chavvy idiots, and block airflow to my intercooler.
    #7
  8. Geeman
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    Geeman Low Life

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    Is there a 'foglight delete' part for S4's then?
    #8
  9. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    On craigs S4 we binned the fogs and just left the round hole in the grille open.

    i think someone sells fogless grilles from some foreign clime, but i dont know any more.
    #9

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