Shifts into 4WD on its own

There is a transfer case control module under the drivers seat that may have got wet or has gone out. here is the location in the diagrams below but we should start by checking the fuses. here is a guide and the fuse locations below:

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

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Question: If I buy a new TCCM will it need to be programmed? What about a used from the same year?

It must be plug and play because the instructions on how to replace it does not mention the reprogramming. Check out the diagrams (below). Please let us know what happens.