That all depends on if the new BCM needs to be registered/paired with the car and code version matched to what is already in your car.
If your other modules are on code version 1 and this new BCM is on version 2 they will not match and may not be able to work together.
Having all of the modules flashed or reflashed to the same code could make that BCM come alive.
This is why when a new module is installed at the dealer they have to put it on the computer for hours. It goes through every firmware on every device to make sure they are all on the supported code matrix.
I say version 1 and 2 just as an example
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