This sounds like the BCM is bad but to be sure let's do a CAN scan. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.
Here is a video to show you how:
https://youtu.be/u-4syLc-ifQ
Here is how the door lock works in the door lock wiring diagrams below. Also, I have included how to change out the BCM as well, you can get a preprogrammed unit by searching Google or Ebay. Also let's check the system grounds, this guide can help:
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
Use the wiring diagrams to see the ground locations. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
Images (Click to make bigger)
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Sunday, September 3rd, 2023 AT 11:03 AM