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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 04-04-2013, 01:47 PM
Pat7762 Pat7762 is offline
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Mein Auto: 05 BMW x3 3.0 + 93 325is
Communicating with modules???

I have tried an autologic, carsoft, an old Launch, and Autel MaxiDAS with no luck. The car is a 93 325is using only the 20 pin of course because its pre obd2. Can anyone explain to me or point me in the right direction on how the modules communicate? I was told it is a primitive bus system. I was also told that if I have a bad module that it will bring down the whole bus system, and was told to start unplugging the modules till the system came back online but I haven't had any success. I don't have any lights on right now but I would like to take a look at some parameters. Any help would be greatly appreciated.
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  #2  
Old 04-04-2013, 03:26 PM
Pat7762 Pat7762 is offline
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I tried hooking up the autel to my buddy's 95 325is and his worked so I checked his pin 20 pin and his showed 3.9volts mine had a ground that was on and off like Morris code. So I guess I do have a module that is grounding the communication line. Now I guess I need to unplug more module.
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  #3  
Old 04-04-2013, 07:38 PM
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Mein Auto: '96 328is Cosmos
Quote:
Originally Posted by Pat7762 View Post
I tried hooking up the autel to my buddy's 95 325is and his worked so I checked his pin 20 pin and his showed 3.9volts mine had a ground that was on and off like Morris code. So I guess I do have a module that is grounding the communication line. Now I guess I need to unplug more module.
Morris code?

Do you mean Morse code?

That aside, what is the issue you are experiencing ?

I've a feeling that you are going into far too much detail for what ever the problem is.

Like Chad, I am far too lazy to double check Swype.
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Old 04-04-2013, 10:17 PM
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Mein Auto: '96 328iC, '04 325Ci
Quote:
Originally Posted by Pat7762 View Post
I tried hooking up the autel to my buddy's 95 325is and his worked so I checked his pin 20 pin and his showed 3.9volts mine had a ground that was on and off like Morris code. So I guess I do have a module that is grounding the communication line. Now I guess I need to unplug more module.
The digital system in your E36 is a CAN BUS network. Pin 20 is the data line and it wouldn't be out of the ordinary to see it toggling between 0 volts and 4-5volts. The "Morse Code" you are seeing are the serial digital words on the data bus. It is possible that you have a module that is ignoring its address and not releasing control of the bus, but you want to unplug the modules one at a time and then plug them back in if it doesn't let your analyzer connect. If you unplug all of them the toggling will go away because all you'll be connected to is wire.....
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Last edited by dc_wright; 04-04-2013 at 10:18 PM.
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  #5  
Old 04-05-2013, 12:42 AM
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The 20 pin, under-hood diagnostic connector on the OP's '93 carries the 12V, open collector, active low D-bus. This 1.3 MB PDF has some information about troubleshooting it, starting on page 13.

Last edited by johnf; 04-05-2013 at 12:53 AM.
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  #6  
Old 04-05-2013, 02:03 AM
Pat7762 Pat7762 is offline
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Mein Auto: 05 BMW x3 3.0 + 93 325is
Thanks guys!! Any known Problematic modules?
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  #7  
Old 04-05-2013, 11:49 AM
Pat7762 Pat7762 is offline
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Originally Posted by johnf View Post
The 20 pin, under-hood diagnostic connector on the OP's '93 carries the 12V, open collector, active low D-bus. This 1.3 MB PDF has some information about troubleshooting it, starting on page 13.
Do you know if the 95 e36 would still use the d-bus system?
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  #8  
Old 04-05-2013, 11:53 AM
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Yes, the E36 used the D-bus with the 20-pin connector for its entire run.
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  #9  
Old 04-07-2013, 06:13 AM
Pat7762 Pat7762 is offline
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Mein Auto: 05 BMW x3 3.0 + 93 325is
Found the problem, it was the IHKA. I unplugged it and my bus was back online. Now I need to find a used one. Thanks for all the replys, the PDF info was really helpful!
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  #10  
Old 04-07-2013, 06:48 PM
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what's an ihka??



df
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  #11  
Old 04-08-2013, 12:03 AM
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IHKA = Integrierte Heiz- und Klimaautomatic = combined, automatic heater and air conditioner

An HVAC for them that like buttons and digital displays with a mind of their own. (Just kidding.)

Last edited by johnf; 04-08-2013 at 12:26 AM.
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  #12  
Old 04-08-2013, 03:19 PM
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ah....gotcha. thanks for the translation.




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