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Just finished swapping over the radio and this is very simple. I like the Scion radio much more.
For those who may try this in the future, the BRZ and FRS both turn on the amp via pin 9, but the BRZ also requires power to the power antenna via pin 8. The FRS radio only sends power to pin 9, so you must send power to pin 8 by either splicing the main harness or you can purchase a reverse harness and splice the wire leading to pin 8 to the wire to pin 9.
I imagine in almost all normal situations you'd want the amp and power antenna on at all times, so if you decide to swap back to the stock radio, everything should continue to work.
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