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everything works except for the display. chances are the nav computer either gone south, or has chaffing wires somewhere...
go the left side of the trunk, where the nav computer is, have the car running, and stick your hand behind the nav computer, and try to wiggle wiggle the wires, without disconnecting them from the module. if you start getting flickering on the screen, something is wrong with the wires, you need to pull the nav comp out, unplug the cables and closely inspect them for loose, chaffing, bend, broken wires...
keep us posted
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