Air bag light on, interior, bed light not working and A/C not blowing cold air?

It sounds like the BCM has gone out, but to be sure we should check all fuses first here is a guide to help with the fuse locations in the images below. Please check the fuses with the key on.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If all fuses are okay, I would run a CAN scan to see if the BCM code comes up, 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 in case you need it as well, you can get a preprogrammed unit by searching Google or Ebay. 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.