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Not sure if you figured this out, but I'm currently having the same problem.
2013 FR-S. Running perfectly fine. Flipped all harnesses to 2013 BRZ, including the ECU and all computer components, Key Immoblizer, everything. Turned the key and I'm getting no crank at all. However I can lock and unlock the door. Hooked up Techstream and I'm getting B1572 code as well. Sounds like a syncing issue. None of the engine components are bad as I flipped back to the FR-S setup and it's back to running perfectly fine.
So it sounds like a device syncing issue, however as far as I know all the components came from the same donor car. If it's a matter of the immoblizer not talking to the ECU then that could be the case...but when I attempt to start the car, I get the green key light as well as the red flashing light still, so the code from Techstream does make sense.
Guess I'll have to invest in the Key-Pass software unless anyone else has some other ideas.
Thanks in advance.
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