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    Quote Originally Posted by af1 View Post
    so i cant use a modified vag com lead (mine is serial) on my 1997 e36? I have to use an ads interface?
    From what I understand, a VAGcom cable will work unmodified with easyDIS on older cars. You might have a problem with INPA communicating.
     
     

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    Nice job!!! Looking forward to getting a car to test inpa on!
     
     

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    Quote Originally Posted by af1 View Post
    so i cant use a modified vag com lead (mine is serial) on my 1997 e36? I have to use an ads interface?

    if you want to access everything with INPA and its got a 20 pin round socket with pin 15 present? nope ya can't its gotta be an ADS interface....

    you may or may not be able to access the engine module and some other modules with your present setup but not all,

    your car is ADS not fully OBD compliant if it has pin 15 present....
    330i sport a big chunk of berlin...

     
     

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    Sorry for all the conflicting advice. With a vagcom lead you should be able to read the DME on the later E36's. I know this as I have done it.

    Ian
     
     

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    Quote Originally Posted by Ian S View Post
    Sorry for all the conflicting advice. With a vagcom lead you should be able to read the DME on the later E36's. I know this as I have done it.

    Ian
    This.

    All E36 94-99 with unmodifled VAGCOM cable plus 16 to 20 pin adaptor you can access

    DME yes
    ZKE yes
    PDC yes
    HVAC yes
    KOMBI No
    ABS/ASC No IanS- Yes 1996 EVO
    Cabrio module Can't remember
    Airbag Can't remember
    RAD No
    OBC Never tried
    EGS Never tried

    Not tried any other modules.
    Last edited by joylove; 15-06-2011 at 12:01.
     
     

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    Thanks for that. For clarity I thought it was 1996 on and it varied model to model? I've read the ABS on my 1996 Evo.

    Ian
     
     

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    Quote Originally Posted by Ian S View Post
    Thanks for that. For clarity I thought it was 1996 on and it varied model to model? I've read the ABS on my 1996 Evo.

    Ian
    Shorting OBD2.7&8 won't harm an E36. OBD2.8 goes nowhere in the 16 to 20 pin adaptor. For E46/E39 ~2002+ without the 20 pin socket OBD2.7&8 must be shorted. Up until perhaps 2008 when OBD2.8 is used for a 1 wire ethernet port of some sort.

    For E36 in Europe nothing changed after 1996 for the diagnostic interface. As they got to about 09/1999 The Z3 and compact were still in production and so that was their time to sellotape on the additional OBD2 commands support that the Yanks had since 1996.

    Furthermore, all models and all years continue to support D2 for the INPA language. D2 persists as the INPA language until at least 2008. All the adaptor needs to do is convert D2 to a 12V one wire interface and put it on the right pin in the car.

    Basically the OBD2 is a second way of talking to a few modules with about 80% less available commands. It does not replace D2, it sits alongside. This is still true today.


    Do D2 and OBD2 commands go down the same wire to the DME for EU 1999+ cars? Electrically there is no reason why not. It is the same 12V idle/0V active, 1 wire interface. You send a command in D2, you get a response in D2. You send a command in OBD2, you get a response in OBD2. Only the baud rates might vary from 9600 to 10.4kbaud.

    According to the BMW technical diagrams, and I don't have a US car to test, there is a second line, TxD2 on pin 17 for DME and EGS only, that can talk OBD2 and D2 at the same time.

    However if you look at the schematic for the car, TxD is still connected to the DME/EGS.

    And so if you have a 1999+ Z3 or Compact you might or might not need to short OBD1.20 and OBD1.17 so you can talk D2 down TxD2. Most 16-20pin adaptors have this mod already from the factory (yellow wire).



    Hope this is mostly right, not had much coffee. I can't test what OBD1.17 does because I don't have acess to an OBD2 E36. If I did I'd try talking to the DME using OBD1.20 and if it didn't respond, then I'd short OBD1.17 and OBD1.20.

    If I were BMW, I'd probably have a totally seperate OBD2 interface on the DME and EGS modules. The TxD and RxD stuff was designed and working and in the field. Adding a second line to carry OBD2 would be the way I would go. This would be TxD2. It could run at 10.4kbaud.
    Last edited by joylove; 15-06-2011 at 11:06.
     
     

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  12. Re: BMW INPA E36 OBD OBD2 and ADS interfaces explained 
    #38
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    Well, I have a very expensive genuine vcds (vagcom) lead and a cheaper old serial one... I will try and get easydis from somewhere and give it a bash, if its no worky then ill buy the ads interface

    Sent from my HTC Desire using Tapatalk
     
     

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    Quote Originally Posted by af1 View Post
    Well, I have a very expensive genuine vcds (vagcom) lead and a cheaper old serial one... I will try and get easydis from somewhere and give it a bash, if its no worky then ill buy the ads interface

    Sent from my HTC Desire using Tapatalk
    Any DIS will need you to run virtual machines and software ethernet-USB bridges. I'd start with INPA. Much much easier to get going. I wrote a guide on installing it in this forum.
     
     

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    but then ill be needing an ads interface?
     
     

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