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  1. #1
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    A4 B5 Airbag Light On No Comms With Controller

    Need some help please, my A4 2.8q has it's airbag light on and i can't get vcds to communicate with the controller to see what's wrong, i have looked at the plugs under the seats and also in the drivers side kick panel to see if there is anything amiss which there doesn't seem to be. Anything i have missed???

    I have searched the net and it points towards a knackered controller, if i get a used one does it require coding to the car??

    Cheers

    Ian

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  3. #2
    griswold's Avatar
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    Its that time of year again, cold sets mine off in the morning, vcds wont clear it.
    I bought an airbag reset tool that does a clear code or reset the controller.
    Works for my controller error but as you cant connect to it maybe not yours but worth a try.
    Airbag ecu behind climate real pain to get to, just need the same number.
    A4 1.8T Quattro sport
    A6 2.4 Avant SE



  4. #3
    griswold's Avatar
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    A4 1.8T Quattro sport
    A6 2.4 Avant SE



  5. #4
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    thanks for the link, just wondering how that manages to get comms and vcds can't?? i don't suppose for a minute that you are in the south east??

  6. #5
    griswold's Avatar
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    Cardiff, can you connect to other controllers?
    A4 1.8T Quattro sport
    A6 2.4 Avant SE



  7. #6
    "Stick a V8 in it!"

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    What age is your car? I have an ECU here if its the right number.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  8. #7
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    it's a 98 car, and yes all other controllers i can connect to no prbs and no other codes, it does have an aftermarket radio which shouldn't make any difference (not fitted by me)

  9. #8
    griswold's Avatar
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    Airbag ecu removal.
    AudiWorld Tech Articles
    A4 1.8T Quattro sport
    A6 2.4 Avant SE



  10. #9
    "Stick a V8 in it!"

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    The one i have came out of a 98, dont want much for it as i had it on ebay twice and it didnt sell. Its 8D0959655L.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  11. #10
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    Thanks for the offer will need to try and find which one i have in the car, will be back in touch

    cheers

    Ian

  12. #11
    brasiliangringo's Avatar
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    Quote Originally Posted by aragorn View Post
    The one i have came out of a 98, dont want much for it as i had it on ebay twice and it didnt sell. Its 8D0959655L.
    How much do you want for it ?

  13. #12
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    I have one too I think from a PFL S4..

    I really need to keep track of my useful stuff

  14. #13
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    Airbag light still on i have checked the K line voltage on the diagnostic plug and that reads 9.5 volts so pretty much what it should be, i have removed the aftermarket radio which was nicely plumbed in, tried again to get the codes but nothing doing still, anything else i can check before ripping the dash apart to get the controller part no.

    Would i be wasting my time soldering the wires under the seats??

    Thanks

  15. #14
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    As an update I sourced another controller from ebay what a touch only £4.99, after a skin shredding session ( I kid you not!!) i managed to replace the old unit with the new / used one if you get my drift. We now have comms with airbag controller yippee, so cleared the faults and now i am only left with one 01218 side airbag igniter passenger side (n200) 32-00 resistance too high.

    Is the fix for this clean the contacts under the passenger seat or solder the wires togther??

  16. #15
    "Stick a V8 in it!"

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    yeh try unplugging and replugging the under seat connector a few times on the passenger side

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  17. #16
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    Hopefully final update, fingers crossed, been out and pulled the plugs off the passenger seat popped them and and off a few times, then plied them with acf 50 which is a great spray (ain't cheap) that helps stop corrosion, deleted the code and hey presto no airbag light.

    Yesterday when i replaced the controller it's not easy on a pfl car, there is a how to out on the web that shows a fl car and removing the ashtray, on the pfl car removing the ashtray makes no difference. My wrists are well chewed up, i ended up wrapping them in gaffer tape to protect them, the plastic is well sharp where the climate and radio sits.

    I will end up zip tieing the passenger seat but it was too wet and miserable to be bothered today


    So a big thanks to all that helped, and i hope this post helps others in the future.

 

 

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