Hi,
I looked through the power distribution schematics and there is nothing that just shuts off the interior. Do me a favor. Take a look through the schematics and let me know if you notice anything that correlates with what is not working. It's odd because I was thinking the ignition two relay may have been the issue, but you said the truck runs, and that powers not only several interior components but also the engine controls. I can't seem to find a break where things that are presently working break away from the non-working components.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
Also, let me know where you saw smoke. Could you tell what it was coming from?
Let me know.
Joe
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Friday, May 7th, 2021 AT 8:55 PM