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Thread: Testbench setup?

  1. #71
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    Don,

    Using a Bluetooth OBD2 dongle and a terminal app on your phone or PC you can send and receive CAN messages. The ELM327 chip in the dongle does the complicated stuff of constructing and deconstructing the CAN packets. Back in 2015, I spent/wasted lots of time looking into this. I've also got a Sparkfun OBDII Uart which I used to log CAN bus traffic.

  2. #72
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    Quote Originally Posted by ibis_white View Post
    Don,

    Using a Bluetooth OBD2 dongle and a terminal app on your phone or PC you can send and receive CAN messages. The ELM327 chip in the dongle does the complicated stuff of constructing and deconstructing the CAN packets. Back in 2015, I spent/wasted lots of time looking into this. I've also got a Sparkfun OBDII Uart which I used to log CAN bus traffic.
    ibis_white: Thanks for the response - I'm very interested to pursue your suggestion, can you provide specific info - please.

    As for your discussion with zenerdiode (also interesting), I was wondering whether a way to defeat the T15 message signal from 05-Access/Start Authorisation module mightn't be to remove this module from the CAN Gateway list. I'm not familiar with Audi vehicles, but I'm assuming that not all Audi models have KESSY. If this is true, then my logic is that perhaps in those models without KESSY, the T15 signal might be generated by the steering wheel module (through the rotary switch that hangs off the back of key barrel). As I said, just an uninformed suggestion.

    Don
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

  3. #73
    Verified VCDS User Zenerdiode's Avatar
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    Quote Originally Posted by DV52 View Post
    If you ever find an easy-to-use CAN message emulator...
    I keep on looking every now and again. I had some links stored about 6 months ago - but can't seem to find them at the mo. Will probably start a new thread when (if) I find them.

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  5. #74
    Verified VCDS User Zenerdiode's Avatar
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    Don, (and ibis_white) I made a big assumption that because we were talking MMI3G - that it was in a later model Audi. Speaking from a B8 (8K) Audi onwards, there's no rotary key barrel. Even if you don't have Audi Advanced Key (KESSY), the key blob is placed in a receptical and 05-Acces/Start Authorisation does the rest from there. 05 is really a phantom module as it is physically located in 46-BCM2.

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  7. #75
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    Interesting thread!

    I can only speak of the Audi A8. The KESSY is part of, as Zenerdiod said, the phantom 05-Acc/Start Auth. modul - which is actually 25-Immobilizer in the A8. A non-KESSY A8 still has modules 05 and 25 but will depend on a key in the ignition.

    As for an easy to use CAN interface to send packets, I've had good success with a tool called CANalyst-II.

    http://www.ebay.co.uk/itm/282097513760?


  8. #76
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    For those who want to understand the data from CAN bus logging this is a great website:
    http://jazdw.net/tp20

    Even dusted off my old Sparkfun logger and had a another go myself.

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  10. #77
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    ibis_white: You are fast becoming my go-to "information mule" of choice (like a drug-mule, but not as financially rewarding and certainly not as clandestine, or illegal) for CAN data protocols!

    Indeed an interesting site - but I have to restock my larder with my preferred alcoholic beverage - can't understand this stuff without a suitable lubricant to aid the synapses to fire!

    thanks for the link

    Don
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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  12. #78
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    i have this :RE









    Last edited by rojas; 03-05-2017 at 04:16 AM.

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  14. #79
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    Quick question -please: I'm contemplating getting the dashboard module (Instrument @ address hex17) on my test bench married - to the immo on one of the fob keys to my Golf mk7 (the real car). I can't find much reading material about this facet of MQB platform vehicles, but I understand (perhaps incorrectly) that the fob key has no internal link to a particular instrument module (it's just a dumb device -in this sense).

    So - my question is: can a mk7 fob key be registered to several instrument modules (immobiliser V)- because I still want the key to work on my real car after it is registered to the instrument module on my test bench?

    Don
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

  15. #80
    Verified VCDS User Zenerdiode's Avatar
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    Quote Originally Posted by DV52 View Post
    ...but I understand (perhaps incorrectly) that the fob key has no internal link to a particular instrument module (it's just a dumb device -in this sense).
    Quite the opposite Don, I'm afraid. The 'Cluster Code' (a series of about 7 bytes) gets written to the key when programming. Since about IMMO3 the chip in your key fob is program once only. It may be repeatedly programmed to the same cluster however, (when eradicating lost fobs for example) as the Cluster Code doesn't change.

    My advice here is to get an identical cluster to the one in your car, learn as much as you can with it, do all of the naughty stuff with the EEPROM, then if you must, have a go with your live cluster in your car. Otherwise, read the 'TT Cluster Black Hole' thread. If you want to play, as well as getting a spare cluster, do some research on what kind of transponder is used in your keys - and buy them separately.

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