1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Key fob will not lock or unlock

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by m.c., Dec 13, 2012.

  1. m.c.
    Offline

    m.c. New Member

    Joined:
    Dec 29, 2010
    Messages:
    6
    Likes Received:
    0
    A4 Cabriolet, B6, 52 reg.

    The other day my fob stoped locking or unlocking the car, now i have to open with the key.
    The central locking works from the buttons on the door once in the car and the lights blink when locking / unlocking with the key.
    I have had the fob checked for a signal and was told it is ok.
    I tried to rematch the key to the car following the methods on the forum but no change.
    Any other ideas of what could be causing the problem, Cheers.
    #1
  2. Jp-tqs
    Offline

    Jp-tqs Member

    Joined:
    Feb 9, 2010
    Messages:
    160
    Likes Received:
    1
    Tried replacing the battery? Low battery could be strong enough for a signal but not enough power to activate central lacking?
    #2
  3. Artimus
    Offline

    Artimus Short Back

    Joined:
    May 9, 2012
    Messages:
    1,878
    Likes Received:
    10
    I tested an option in VCDS that when you set the car to Transport Mode, it disabled the remote locking, along with 1 or 2 other things. Exit Transport Mode returned it to normal. You haven't had it on VAGcom recently have you?
    #3
  4. stu_m
    Offline

    stu_m Active Member

    Joined:
    Oct 25, 2009
    Messages:
    1,442
    Likes Received:
    1
    lock the car and leave it until the hazard light goes out

    then press unlock on the fob if the hazard lights up it is getting the signal but not unlocking the doors

    mine did this and I had to disconnect the battery for a few minutes then reconnect and all was well
    #4
  5. leonwilliams
    Offline

    leonwilliams New Member

    Joined:
    Dec 27, 2012
    Messages:
    10
    Likes Received:
    0
    Hi i had same problem with my fsi lights flashing but no sound . i put spare key in ignition. other in door pressed open 4 times . then again. works fine now.
    #5
  6. Jay85
    Offline

    Jay85 New Member

    Joined:
    Sep 16, 2006
    Messages:
    27
    Likes Received:
    0
    Mines intermittent. Ocassionally doesnt work. Fuses? Not sure whether central locking is fused?
    #6
  7. Artimus
    Offline

    Artimus Short Back

    Joined:
    May 9, 2012
    Messages:
    1,878
    Likes Received:
    10
    mine miss fired once last week! hasn't done it since and I pit it down to either a lowish car battery (now charged) or the receiver didn't pick up the signal. :shrug:
    #7
  8. docurley
    Offline

    docurley Moderator Staff Member Moderator

    Joined:
    Dec 12, 2003
    Messages:
    3,859
    Likes Received:
    1
    Just put key in ignition turn on (dont start) press lock and open button and all should be good if the battery is not dead.
    #8
  9. demus
    Offline

    demus Member

    Joined:
    Sep 9, 2009
    Messages:
    213
    Likes Received:
    1
    Mine has done this a couple of times, tried all the usual things of holding lock / unlock, in door, in the ignition etc... nothing worked.
    For some reason the car loses the code and it all needs re-coding, Audi charge about £40 to re-program it....
    #9
  10. pbarlow0032
    Offline

    pbarlow0032 Member

    Joined:
    Oct 18, 2012
    Messages:
    151
    Likes Received:
    0
    I've got the same problem with my spare, Demus can you just get this done at any Audi main dealer? I keep putting off sorting this, but I need to do it before I need it!
    #10
  11. demus
    Offline

    demus Member

    Joined:
    Sep 9, 2009
    Messages:
    213
    Likes Received:
    1
    I'm guessing you can yes, I'm not sure if the buttons on my key are anything to do with it, it used to work from a hell of a distance, now you have to be in spitting distance.. batteries all ok.. It seems to do it if when walking to the car, I press unlock, it doesn't unlock due to the crap range, then press a couple of times more, it all gets out of sync and goes tits up.
    I only have the one key and keep telling myself I really should get a spare, still haven't got one!!

    Only takes about half an hour for the stealer to do.. if anything like mine they will also tell you that there are numerous fault codes stored, they have obviously read them, but won't tell me without another wad of cash, twats...
    Got VCDS and no codes were stored !! (Oh, and that it was allegedly running rough ??)
    Anyway rant over, check on here, there are some clever guys with the full VCDS and could probably do it for you cheaper than the stealer, sorry I mean main dealer...
    #11
  12. stu_m
    Offline

    stu_m Active Member

    Joined:
    Oct 25, 2009
    Messages:
    1,442
    Likes Received:
    1
    you dont need it recoding at the dealer it will more then likely be the fob thats working loose and loosing contact with the battery

    Open the fob and bend the battery pins out slightly loads of us had the same problems on here and did this and all has been fine since

    do a search
    #12
  13. demus
    Offline

    demus Member

    Joined:
    Sep 9, 2009
    Messages:
    213
    Likes Received:
    1
    That didn't work with my bugger unfortunately... I did wonder if the antenna in the car was ok, don't suppose anyone knows where it is ??
    #13
  14. Artimus
    Offline

    Artimus Short Back

    Joined:
    May 9, 2012
    Messages:
    1,878
    Likes Received:
    10
    The receiver is by the centre speaker on the dash, where the flashing red LED resides
    #14
  15. Inertiauk
    Offline

    Inertiauk Member

    Joined:
    Mar 23, 2011
    Messages:
    535
    Likes Received:
    0
    audi have been pulling your pants down its really easy to do you just need 2 keys (1 doesn't have to be a remote key)





    1) Take the key you DO NOT want to program and put it in the ignition. Turn it one click forward.
    2) Close and lock the drivers door with the second key.
    3) On the second key (the one in the drivers door) press the 'UNLOCK' button ONCE only. The lights will flash on the car, but the doors will remain locked
    4) With the second key still in the drivers door, unlock then lock the door again.
    5) Pull the key from the slot and test remote functions.
    6) Open drivers door, remove key from ignition.
    #15
  16. demus
    Offline

    demus Member

    Joined:
    Sep 9, 2009
    Messages:
    213
    Likes Received:
    1
    #16
  17. gen.heinz guderian
    Offline

    gen.heinz guderian Active Member Regional Rep

    Joined:
    Jun 24, 2011
    Messages:
    1,358
    Likes Received:
    5
    you will need SKC to code new key to car with vcds , you may have it on small tab with your handbook/key.
    #17
  18. Inertiauk
    Offline

    Inertiauk Member

    Joined:
    Mar 23, 2011
    Messages:
    535
    Likes Received:
    0
    the second key needs to be coded to the cars immobiliser system which does need to be done by a specialist. However there is a way around it if you don't have a second key.

    get a plain key and have the blade cut, sit in the drivers seat with the window down and the 'cut but not immobiliser programmed' key in the door outside.

    Put your original key in the ignition and turn to position 1.

    either have a friend help or reach our through the open window and lock the car using the 'cut but not immobiliser programmed' key.

    press unlock, lock, unlock on your original key, then remove it from the ignition. Remove the key from the door and test your fob, it should be working.

    Hope this helps.
    #18
  19. pbarlow0032
    Offline

    pbarlow0032 Member

    Joined:
    Oct 18, 2012
    Messages:
    151
    Likes Received:
    0
    My spare key doesn't work as a remote but does open and lock the car in the door lock, and does start the car. I put a new battery in the spare key when I bought the car (a few months ago). Should the process InertiaUK mentions above work? I might have another fiddle with the battery pins (cheers STU_m).
    #19
  20. pbarlow0032
    Offline

    pbarlow0032 Member

    Joined:
    Oct 18, 2012
    Messages:
    151
    Likes Received:
    0
    Right, tried pulling the pins out a bit, battery is definitely making contact. Tried battery both ways up too just in case. Nothing at all happens when I press the unlock/lock button. No lights flashing etc, no locks unlocking! If I read the earlier posts correctly, it should still make the alarm lights blink evn if it isn't opening properly?
    #20
  21. stu_m
    Offline

    stu_m Active Member

    Joined:
    Oct 25, 2009
    Messages:
    1,442
    Likes Received:
    1
  22. Inertiauk
    Offline

    Inertiauk Member

    Joined:
    Mar 23, 2011
    Messages:
    535
    Likes Received:
    0
    You have 2 keys for the car, sync it as in the first post I made above .
    #22
  23. Stu!!!
    Offline

    Stu!!! Member

    Joined:
    Feb 10, 2011
    Messages:
    60
    Likes Received:
    0
    I've had the same problem twice now, without knowing the exact reason it stops working, in my situation, its been related to the antenna / receiver for the fob.

    If you go into the boot, and simply try pressing the key fob in a few random places, hopefully, it will receive the signal and all will be well again - mine just works as per norm now :)
    #23
  24. pbarlow0032
    Offline

    pbarlow0032 Member

    Joined:
    Oct 18, 2012
    Messages:
    151
    Likes Received:
    0
    Inertia, I tried doing exactly what you describe in your first post, but when I press the unlock button on the (non working) key, there is no light flash. Am I missing something obvious?
    #24
  25. BlackQuat
    Offline

    BlackQuat Active Member

    Joined:
    Nov 24, 2009
    Messages:
    1,790
    Likes Received:
    2
    I recently had this. Took the car battery off, put it back on. All good.
    #25
  26. glenandem
    Offline

    glenandem Member

    Joined:
    Sep 23, 2012
    Messages:
    561
    Likes Received:
    0
    same here with my spare key,tried new batts and all different ways of coding and never get flashing lights?
    #26
  27. Stu!!!
    Offline

    Stu!!! Member

    Joined:
    Feb 10, 2011
    Messages:
    60
    Likes Received:
    0
    The booster / Antenna for the fob / signal is in the boot, if you move the fob around the boot whilst pressing either lock or unlock etc, it will pick up a signal again.

    This has worked everytime... resyncing, disconnecting battery etc just didnt work ...
    #27
  28. stu_m
    Offline

    stu_m Active Member

    Joined:
    Oct 25, 2009
    Messages:
    1,442
    Likes Received:
    1
    Could peoples problem be broken wires between the boot and main body?
    #28
  29. leonwilliams
    Offline

    leonwilliams New Member

    Joined:
    Dec 27, 2012
    Messages:
    10
    Likes Received:
    0
    Hi thats a strange one if it works in the boot but not outside the car could be a reciever problem, like i said earlier mines just stopped working both fobs..lights where flashing no sound i got in car turned ignition on and it stopped..i checked the forums and it just said open drivers window, put one ket in ignition turn but dont start other key in door press open 4 times lights should flash, then do it again and that should be it..i had to use key when it went on one i was like wtf....but its fine now both keys work

    can you not get someone with vag-com in your area to check for error codes
    #29

Share This Page