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I was also interested to know the model numbers on the original radio that you removed from your 2013 FR-S.
Pioneer model CVH-2238ZT is Toyota model PT546-00140. Number printed on front is AXCP-Q14U T10015.
There was a TSB for the earliest BRZ HUs to improve GPS reception. It consisted of a software upgrade, and a new bracket and GPS antenna that moved that antenna further to the right (still above the HU). But your FA632US should already have that update.
Where is your GPS antenna? Can you post some pictures?
You could try unplugging the power cable from the HU for a minute to reset it. Then turn your key to ACC while you're parked somewhere with an unobstructed view of the sky, and give the HU 5-10 minutes to reacquire the GPS satellites.
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