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Prius 2001 power steering

The power steering in my 01 Prius doesn’t work at all.I replacing the steering rack and the control module with used ones and that didn’t help at all.I got a 1521 trouble code,motor curcuit malfuction and a 1552`PIG power source circuit.I am thinking I should replace the module, if I do will the new module be compatable with the original steering rack? Thank you very much for your time.nick