I think horn is unrelated. You can hear it start to blow and the fuse pops. Yes statement 3 was in error, I was recovering from surgery and had someone else check the under dash fuses that told me they were good. I am mobile enough to do things for myself. That is when I found the problem. BCM is installed and programmed, everything works as advertised and the BCM will communicate with the scan tool now. I was just confessing my blunder since ya'll took the time to post and help.