“How do I deal with the CAN-BUS?” “How can I make the instrument cluster work in an e39 with an engine swap?” I get asked this question more often than you can imagine, Posts, PMs, e-mails, texts, Facebook messages (and I’m not even on Facebook
). I don't browse this forum very often or have time to respond in depth to every inquiry. The basics have been posted by me and others, but now I am going to put it all in one place. All inquires will be directed here.
First off, I take absolutely no credit for figuring this out, Schitzo figured out how to make this work by some form of magic long ago.
In the modern era, the IKE can be recoded easily with NCS Expert and/or PA Soft, which I prefer for this particular application because it is so easy and very hard to do incorrectly (also it is way easier to show how do this in PA Soft than it is with NCS Expert).
If you can’t get NCS Expert to work and especially if you can’t get PA Soft to work, you really shouldn’t be trying to do the recoding. The same thing goes if you can’t read the WDS wiring diagrams or add a wire to a BMW connector.
This thread is how to do the coding and make the cluster work, not how to wire the entire car.
The e39 has a lot of modules, which are all just small computers. They will eventually drive you nuts if you have one of these cars long enough, but one advantage is that they allow BMW to use the same parts for cars in different markets with different options.
What you need to do is to tell the instrument cluster that the coolant temperature signal and the tach signal are old-fashioned analog signals. The good news is that in some e39s this is true, so the cluster has to be able to accommodate analog signals for these gauges.
Below is the screen from PASoft where you do this:
As you can see, the yellow area shows
UNCHECKED boxes for “Engine speed via CAN” and “Coolant temp via CAN”. Once these boxes are
UNCHECKED, the instrument cluster stops looking for these signals by the CAN BUS and starts looking for them as analog signals – it is that easy.
If you need to get rid of the automatic transmission gear indicator, then check the "Manual" option under "Gearbox". The "Engine" area is where you can make adjustments to the how the tach signal is being output from the LS computer (you can change that in the GM computer as well, but that is outside the scope of this post).
You can also use PASoft or NCS Expert to change the maintenance indicator (the area labeled "Service Intervals"), turn off the DSC light and lots of other things, but that is outside the scope of this thread.
Now that the cluster is re-coded, you need to do some wiring, so that the instrument cluster can get the analog signals that it is now looking for. The tach signal wire will usually be in place but check it, here is the WDS wiring diagram:
Make sure that the wire #3 on connector x10114 goes to the tach signal and it will work (verify the wiring diagram for your level of instrument cluster just to be safe).
Here is the coolant temp WDS wiring diagram:
For the coolant temp signal, one wire will usually be missing, so make sure that they are both there by adding a wire to the connector at the missing pins #18 and #19 on connector x10114 are connected to your BMW coolant temp sensor (again verify the wiring diagram for your level of instrument cluster just to be safe).
There you have it.
I ask people please not to clutter this thread with a bunch of junk and to keep it focused so that it is of use to other people. 
Happy swapping! 
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