is your d3 still hooked up or are you back to stock? Disconnect the battery for about 30min and while its disconnected go through all your fuses again, sometimes fuses can look ok but they are bad. Hopefully after the 30min the BCM with be re-set and work normal again. What kind of vehicle is it?
I just don;t see you frying a BCM from a HU install unless you really crossed some wires but even then you would had to of been pulling wires out from somewhere else besides the factory harness for your stereo. Do you have a amp installed anywhere? Did you pop the main fuse by ground out the