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Thread: bmw e39 cannot communicate with any modules except DME

  1. #1
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    bmw e39 cannot communicate with any modules except DME

    i dont have round connector.only inside car,i bridge 1-2 and 7-8 and the same thing. with scanner 1.4 and inpa cable.car 520d turing 2001yearin obd 2 in car there are wiring on 7 annd 8 too
    i only read engine
    i have and vagcom blue interface but cant make to work too
    i tried inpa on other e39 520 and works.also try on my e 38 connect to round connector over adapter and works inpa and scanner.but dont work on this friend touring
    and which pins in round connector i need to bridge to use obd2 connector in e46.i raed them with adapter under bonnet,but it be nice to use it in car.thanks a lot and sorry at too much questions

    i also have problem with ibus on radio dont work,but i connect new wire from lcm to radio and it work.

  2. #2
    geargrinder's Avatar
    geargrinder is offline Having No Trouble Here BMW CCA Member
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    As I said in other thread... but recap here...


    Quote Originally Posted by geargrinder View Post
    Well then I think its clear - the car has a problem not the cable pins or anything else like that.

    The DME (and EGS/AGS if you have automatic transmission) should be on pin 7

    Cluster and ABS, should be on pin 8

    But - for everything else - the diagnostics go THROUGH the cluster as a gateway.

    So: if your cluster is screwed up and you can't talk to it, then you can't get to any of the things 'behind it' either. See below0

    (ignore the 20-pin part of the diagram below - the TXD1 and TXD2 for a post 2000 car both go to OBD on pins 7 & 8.)



    Quote Originally Posted by geargrinder View Post
    You can't just wire the Ibus to the OBD, it needs to go through the cluster for the software to talk properly.

    yes cluster maybe could have some problem. could be the cluster is bad, or, could only be wires or connectors to the cluster. if you can't 'talk' to the cluster then that's the very first thing to fix. the cluster "runs" the I and K buses for all the other modules, so if its broken or not wired correctly they can't talk to each other even if they are perfectly fine. yes trying a spare cluster if you can might help. but if it is a wiring problem in the car then there could be a short someplace else keeping the cluster from being able to communicate. you can also test the I bus and K bus wires and see if they have voltage when the car is turned on but to fully test them is a bit more complicated.
    2003 M3CicM6 TiAg
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    2014 BMW X1 xDrive28i (wifemobile)

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  3. #3
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    That or your pin8 is pushed too far back in the obd connector to make a proper connection.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  4. #4
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    i was loking pin 8 sits normal in socket.i try to replace cluster but i have before facelibt ,so i must find cluster from facelift to try

  5. #5
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    You can disconnect one K-line module at a time to see which module is taking down the communication.

    There is a K-line junction point in the car where all K-line meet. There you can unplug each one by one until communications respond.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  6. #6
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    where is that point?

  7. #7
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    In E46 it is behind the glovebox, inside the junction block.

    Very similar to this https://www.bmwgm5.com/K-Bus_Troubleshooting.htm

    - - - Updated - - -

    But on e39, according to this thread https://www.bimmerforums.com/forum/s...arbox-E39-2000
    it is under the driver's seat carpet.

    In your car, you would be looking for the white/purple wires.

    Have you checked for how much voltage is on pin 8?
    Last edited by 328 Power 04; 08-08-2017 at 04:49 PM.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  8. #8
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    i will check

  9. #9
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    Use a Digital Multimeter to check the voltages on your OBD port. K-Lines (Pins 7 & 8) should show at least 2.5v. I suspect you will have voltage on Pin 7 but not on pin 8. Pin 8 provides the connection via the IKE to other modules of your car. The splice for connections to Pin 8 (x183) is located in a plastic box under the drivers' side footwell of your car. It is anchored to the vehicle frame by one nut and 2 plastic expanding plugs and connections at this splice point are prone to problems due to ingress of moisture and/or corrosion. Unless you have been messing about with coding/programming software, your IKE is unlikely to have been corrupted.

  10. #10
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    ok.thanks a lot a wil try

  11. #11
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    pin 7 8volt
    pin 8 0volt

  12. #12
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    You have a break in pin 8, probably somewhere from the junction under the carpet to the obd port. You will have to chase the wire to find the problem.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  13. #13
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    The break will 99.9% be at connector x183. You can try jumping a wire from the back of the cluster to pin 8, and see if you have full diagnostics from there. The problem is that connector x183 is a splice between the IKE, several ancilliary modules and your OBD port - chances are that if one of the connections have failed, the others are probably on the brink of a similar failure.

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  15. #15
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    thanks

  16. #16
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    Glad that your problem is fixed.

  17. #17
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    thanks wery much

  18. #18
    geargrinder's Avatar
    geargrinder is offline Having No Trouble Here BMW CCA Member
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    nice. nailed it.
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  19. #19
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    on my 725tds 1996 cannot connect with auhilary heater,a looked and there is no wire on socket on webasto on pin 2.can i connect new wire to pin 2 and splice somewere to k line wirings

  20. #20
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    If the problem is the connector x183 how do you fix it? Is there a part number to order or is it a fuse?

  21. #21
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    It is just a splice. You can order parts if you want to do it the hard way or just solder all the wires from the splice together and encapsulate the whole connection in double walled heatshrink tubing.

  22. #22
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    I have this same problem with my 2001 M Roadster. Anyone know if the splice point is in the same location? Thanks

  23. #23
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    Quote Originally Posted by kmassey View Post
    I have this same problem with my 2001 M Roadster. Anyone know if the splice point is in the same location? Thanks
    On your car you should be using the 20-pin port.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  24. #24
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    I have the same issue, no start as well will look for this!


  25. #25
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    issue with not reading past DME

    Quote Originally Posted by kmassey View Post
    I have this same problem with my 2001 M Roadster. Anyone know if the splice point is in the same location? Thanks

    I too have a roadster, 3.0L, with the same problem (the BMW scanner can't read anything past the DME). What happened in your scenario, how did you fix the problem?

    Herb

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