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Thread: Spare Key

  1. #11
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    Re: Spare Key

    It doesn't look familiar but then again I wasnt taking much notice. I'll have a look tomorrow. It will be in the skip!

  2. #12
    SEC Member Stradale493's Avatar
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    Re: Spare Key

    I think the yellow plastic boxes are the earlier "code" immobiliser from 155 era cars so may not be useable with a "code2" era ECU. There is also a later blue box that I think is CF3 era ECUs.
    The immobiliser code boxes pair with the ECU the first time the ECU is powered up and once an ECU has paired with a code box it can't be used with a different code box (unless you can reset the ECU back to factory fresh "virgin" - which I'm trying next).
    The code box stores the list of valid keys and when you turn on the ignition the ECU asks the code box if a valid key is present, if the code box says "yes" and the ECU recognises the code box as the one it is paired with it then allows the engine to start.
    As I understand it the two ways of adding keys are;
    1. Use the 5 digit car security code (on a credit card) and software like AlfaOBD to add a new pre-prepared key to the list stored in the code box (needs OBD port wired to both ECU and immobiliser box - dealer method) or
    2. Extract the list of valid keys from the code box memory chip and burn a new blank transponder to match a valid key already in the list (needs eeprom reader and specialised transponder coding hardware & software - locksmith method).
    I'm a mechanical engineer, not electronics so this is a bit out of my comfort zone but I'm getting there.

  3. #13

    Re: Spare Key

    Graham, had a look at my code box today, Green Label, made in Australia!!! Don't know if that adds to the scheme of things.

    Robin

  4. #14
    SEC Member Stradale493's Avatar
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    Re: Spare Key

    Did a bit more tinkering on my "green label" immobiliser box today - i used the data dumped from the box memory to burn a new pre-coded transponder and it looks like it works without any need to add it to the stored key table.
    As I'd previously manually added a new transponder the "add new key" process wiped all the old transponder key records (the box didn't come with any keys) so there was only 1 valid key stored.
    The software appears to have produced an exact duplicate of the key that was already stored in the key table and both key transponders appear to work, but I can't be sure until I can get this immobiliser box paired with an ECU and get a "OK to start engine" message from the ECU.

  5. #15

    Re: Spare Key

    Graham, are we close to a 'Eureka' moment.

    Robin

  6. #16
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    Re: Spare Key

    Blimey! It's all beyond me , but it sounds promising.

  7. #17

    Re: Spare Key

    John, I'm with you on this, in fact I'm about 6 fathoms down.

  8. #18
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    Re: Spare Key

    Well for you and me Robin that is WAY over our heads!��

  9. #19
    SEC Member Stradale493's Avatar
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    Re: Spare Key

    I'm reasonably confident I could produce a working transponder chip for the green labelled box if I was emailed a dump from the memory chip. Also a good probability I can extract the 5 digit security code if needed. Only way to confirm it would be to try one.
    I may pick up another off eBay to prove my technique.
    Still trying to translate that knowledge to the white label box which looks like it stores the codes in the same location but uses a different algorithm (or substitution cipher) to translate it into the actual pin code

  10. #20

    Re: Spare Key

    Graham, are you talking about the chip in the key here, and how do you create a 'xxxx' via email? It all sounds very complex, and that I would need very technical assistance to achieve success !!

    Robin
    Last edited by Longtimefan; 17-06-2020 at 10:07. Reason: To fend of Norm !!!!

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