It sounds like the BCM has gone out, but first let's check the fuse #41 50 amp in the fuse panel under the hood. here is a guide to help check for power and to see if the fuse is any good. Was the car driven in heavy rain? I have seen components get wet and cause issues.
Also, we can try to confirm the failure by doing a CAN scan, you can get a CAN scanner (Controller Area Network) from Amazon for about $32.00. here is a video to show you how:
Let's check all of the fuses as well with the key or power systems on. If codes for the BCM come on you can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Tuesday, January 17th, 2023 AT 1:27 PM