Transponder bypass

Discussion in 'Tech/Mech General' started by haganap, Feb 12, 2011.

  1. haganap

    haganap Funster Life Member

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    What a shockingly bad day :Sad:

    Went out to the van to continue to pack it for skiing when the immobiliser light would not go out. This has happened 3 times in 3 years. However, on the previous occasions, it managed to rectify it self but on this occasion I actually had to call the AA. He came out tried this and that to no avail. Finally he unplugged it from the transponder box and plugged it back in and away it went. Fine, great , right smashing. Drove off to get gas, stopped on garage forecourt and it done exactly the same again, different AA man this time, and I unplugged it my self from the transponder box to no avail. However, when he went to make a phone call, I again unplugged and plugged back in and bingo, right as rain. it now continues in much the same fashion, working fine. However I just know it wont last.

    DOes anyone know if this can be bypassed? if so is it a simple job, and yes I know about the insurance issue but to be honest, no point having a van that you cant use.
     
  2. SandJ

    SandJ Read Only Funster

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    Paul

    Try a Pm to Geo, he should know

    Steve
     
  3. pappajohn

    pappajohn Funster Life Member

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    the immobiliser is part of the ECU Paul.

    i beleive it can be bypassed but needs to be connected to a diagnostic computer to rewrite the software.
     
  4. haganap

    haganap Funster Life Member

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    so what do you think is the best option John?

    Key assist say they can come and re programme the transponder and keys for £230 +vat? I don't really see how this would resolve the issue? surely it wil give it the same problem in the future
     
  5. pappajohn

    pappajohn Funster Life Member

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    dont know/heard of anyone with this problem so i really cant advise you Paul.

    £230 sounds a lot for a few minutes work with a computer module though !

    i assume you tried with all keys/fobs ?
     
  6. haganap

    haganap Funster Life Member

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    yeah, exactly what I thought really.

    Tried all keys, now just been out for a while must of started and stopped 30 times with out an issue, just a blip or a major problem who knows, think Im going ot run with it.

    However possibly of no relevance or not who knows?
    The diagnostic for this fault is described as static in the key & or/transponder. I kissed Nikki went to kiss me earlier and we nearly knocked each other out with static ? weird co-incidence or not?:Eek!:
     
  7. Heyupluv

    Heyupluv Read Only Funster

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    haganap
    If its the new Fiat multi jet 130 like mine....This has happened to me twice this year, both times it has been when the battery has gone flat with it being stood for a long-ish period and not been used, and I have had to open the cab door with the key to get in, so maybe there is not enough power to disable the immobiliser.. because the battery has been so flat.......what I have found after been on a long run of about 40 miles and put some charge back into the battery.....or charged the battery up again then locked and unlocked using the key fob again all is back to normal...I hope that is the same as yours and is of some help.......:thumb:

    Mel:Wink:
     
  8. jhorsf

    jhorsf Read Only Funster

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    Paul you have pm
     
  9. haganap

    haganap Funster Life Member

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    Thank's for that Mel.
    Its the 2006 last of the 2.8s although it is said that what you are saying could cause the problem. However mine has been on hook up on my drive and I moved it 3 times in the last couple of weeks without an issue. There just seems no rhyme or reason for it :Sad: if there was I could narrow it down. And frominternet searches, it appears that its not an uncommon problem. Also when people have paid ridiculous ammounts to main dealers to have it rectified it has come back again. Which seems that they are not really being fixed. I mean mine has done this 4 times in the 3 years Ive owned it.
     
  10. haganap

    haganap Funster Life Member

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    Thanks for the pm John (jhors) I have actually seen that thread earlier in the day. Again it just seems that no one actually knows when you read the forums. One of those things that like in my case, it goes a year or 6 months before it happens again and people give up bothering to fix it. :Smile:
     
  11. jhorsf

    jhorsf Read Only Funster

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    Paul I have read that Eddie at vanbitz has a lot of experience with this problem of immobilisers on Fiats may be worth an email or bell?I have always found this company very helpful
     
  12. haganap

    haganap Funster Life Member

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    saw that thread as well John :BigGrin: advice seems to be do nothing...:Smile: so fingers appear crossed.:Mellow:
     
  13. Gooney

    Gooney Funster

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    Given that the immobiliser is part of the ECU it might be worth having your vehicle hooked up to the Diagnostic computer for an historic check. I was having an annoying warning lamp coming up on the dash that according to the manual was listed as 'other faults', I took it in and within minutes it traced the fault to a damaged oil pressure switch connector. My point is you could have spent weeks probing around in the dark for an intermittent fault but it's just possible the diagnostics may pick it up immediately.
     
  14. haganap

    haganap Funster Life Member

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    It was plugged in and came back without a fault sadly. In a way I wish it said there was one so I would know what to get fixed. something about, the transponder is saying to the key "what's your number" the key saying "my number is this" the transponder then saying, "nope your a liar" as if someone was putting a different set of Ducato keys in, and therefore it would not show up as a fault, because in fact, it is doing exactly what it should do by refusing access :Sad: can you see the predicament?
     
  15. hilldweller

    hilldweller Funster Life Member

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    No it's not.
     
  16. Gooney

    Gooney Funster

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    See Papajohn quote Brian
     
  17. dazzer

    dazzer Read Only Funster

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    We had a similar fault with our Iveco van a few years ago. Our garage told us to get a spare key made (just the key bit without the transponder bit attached) and tape the original key to the black transponder reciever at the back of the ignition barrel.

    Did it and never had a problem again :thumb:

    Also gives you a spare hidden key if you ever need one but does do away with the security side of the system :Wink:
     
  18. haganap

    haganap Funster Life Member

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    thats an interesting solution Dazzer. So, you had a spare key made without the transponder, and taped the original to the box? did you have to take off the bit that is connected to the ignition barrel? the little loop thing? the job of that is to send the message to the box to give the box the keys number.
    What you are saying actually makes a little bit of sense, but im not sure how it could work.
     
  19. dazzer

    dazzer Read Only Funster

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    Hi.
    All we did was tape the whole key to the box at the back of the ignition switch. The new key we had cut is just a plain steel key with no transponder in it.

    The garage told us that if the battery is a bit low or the weather is cold the sensors loose efficiency and sometimes have trouble reading the signal. Moving the transponder next to the receiver eliminates the problem of distance from the ignition switch to the sensor.

    Not sure if its right or not but we have never had a problem since and the spare hidden key has been a godsend on more than one occasion!!! :Wink:
     
  20. haganap

    haganap Funster Life Member

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    Thanks Dazzer, that makes a lot of sense actually. The only thing is that I have two keys. I was wondering if I could use one to tape as you say and carry on using the other.

    Spoke to someone else today who suggested this fix to. :thumb:
    seems ok again at the moment and as said that is the worry as you never know if or when its going to happen again :Angry:
     

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