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A4 B5 Airbag Light On No Comms With Controller

Ian2012 Dec 11, 2012

  1. Ian2012

    Ian2012 Active Member

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    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
     
  2. griswold

    griswold Member

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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.
     
  3. griswold

    griswold Member

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  4. Ian2012

    Ian2012 Active Member

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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??
     
  5. griswold

    griswold Member

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    Cardiff, can you connect to other controllers?
     
  6. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    What age is your car? I have an ECU here if its the right number.
     
  7. Ian2012

    Ian2012 Active Member

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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)
     
  8. griswold

    griswold Member

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  9. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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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.
     
  10. Ian2012

    Ian2012 Active Member

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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
     
  11. How much do you want for it ?
     
  12. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    I have one too I think from a PFL S4..

    I really need to keep track of my useful stuff
     
  13. Ian2012

    Ian2012 Active Member

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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
     
  14. Ian2012

    Ian2012 Active Member

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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??
     
  15. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    yeh try unplugging and replugging the under seat connector a few times on the passenger side
     
  16. Ian2012

    Ian2012 Active Member

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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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