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Some cars have ABS modules that are coded to the car, so that replacement also requires recoding. I've had two go bad on me; one was replaced/recoded with a used unit, the other was sent out to a repair facility. Both results are currently working flawlessly.
These days the ABS module does a whole lot more than just keep the brakes from locking up in an emergency. It is part of the traction control system, on some vehicles it performs a "limited slip differential" imitation, and on some vehicles it keeps the front brake pads clean, dry and close to the rotor via regular very light application of pressure. In short the little buggers are quite busy indeed.
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