Nice job!!! Looking forward to getting a car to test inpa on!
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....
All E36 94-99 with unmodifled VAGCOM cable plus 16 to 20 pin adaptor you can access
ABS/ASC No IanS- Yes 1996 EVO
Cabrio module Can't remember
Airbag Can't remember
OBC Never tried
EGS Never tried
Not tried any other modules.
Last edited by joylove; 15-06-2011 at 12:01.
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.
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
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but then ill be needing an ads interface?
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