Why are the cluster and dash lights staying on when I shut off ignition?

Yep, that would be a BCM error, so it sounds like the BCM is bad. I would do a CAN scan to be sure. 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 to change the BCM out, you can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Let us know how it goes.