I am wondering if my BCM is going out due to the following symptoms. Some of my power windows used to work, but none of them work now. The radio makes a loud squealing noise with ant station with the volume all the way down. The sunroof does not work. The interior lights near the sunroof are not working, the power locks and seats don't work. Any ideas? Thanks.

Sounds like multiple issues.
The radio sounds like the classic Bose speaker amplifier problem (not related to BCM).
Seats/windows/locks are indeed BCM related, but there are multiple modules and actuators that control the pieces.