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FA643US is Subaru P/N 86271CA640. parts.subaru.com says that was used in 2015 BRZ models (no 2014s). In other words, it's fairly new
There's a chance that the newer BRZ HUs are also supplying 12V power to that pin on their AM/FM socket. Can you check that with a voltmeter?
If that HU isn't, I think you'll find that you get even better reception (and less drop-outs, and pull in weaker stations) than what you're getting now if you add that wire.
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