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What system have you got??
Standard - wires direct from head unit.
Hi-Fi and Logic7 they come from the amp in the rear.
Not had a phone kit fitted or anything??
How old is the car?? If it is under warranty I would get it in, nothing really to come loose, sounds more like a bad joint somewhere on the pcb in the nav or one of the output channels gone.
Is the sub under the seat still working??
Fade to front and right to test if you get anything at all.
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