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Probably related to factory amps? or stacker in the boot?
My Max doesnt have it anymore, my Cefiro has a the same harnesses including the one you circled, dunno what its for though, my Ceffy picks up weird CB signals, airport chatter, etc.
Track down a wiring diagram for both stock 89-94 Maxima and that head unit, see what you can find.
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1994 HJ30 Maxima_Titanium Edition VG30E, Auto [233'000KM] Daily -> Epic Future Project ------------------------------------------------------
1988 CA31 Cefiro_Sport Cruising / Almost ready  RB20DET, 5 Spd Manual [92'000KM] HD Clutch, Nismo mech. 2 way
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