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I don't think the DOME light fuse in the relay box in the engine bay is the problem.
The wiring diagram (page 76 of BRZ wiring manual) shows it feeds off a signal from the main ecu to the door switch to the dome light for the door mode. IF the fuse was a problem at all then it would not work in direct on mode either.
I would be tracing down the door switch and lastly the main ecu signal. Possibly even the wiring in the dome light if there was any disassembly such as installing a homelink dimming mirror.
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