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IT WOULD BE CHEAPER GO TO TARGET, SEARS, RADIO SHACK BUY A GARMON OR TOM TOM GPS FOR $100.00 TO $150.00 JUST PLUG IT IN THE CIGARETTE LIGHTER.YOU READY TO GO THE GPS BUILT IN THE DASH UP IN THE THOUSANDS OF DOLLARS.YOU LOOKING AT $3000.00 TO $4000.00 THATS THE GPS PLUS NAVAGATION SYSTEM.
I have experienced many electical demons with all my British cars. The nav units can and do fail. I had a goofy one this summer and the only way it got fixed was to replace it. The module not the head unit
NAV unit uses a DVD disc. If its a copy, it may or may not work. I suggest you remove the NAV disc, unplug the NAV unit from power for 4-5 minutes, reconnect the NAV and try inserting the disc again to see if it reads. If it still does not read, another NAV disc needs to be inserted to verify its not a "bad" NAV DVD disc issue. If it still cannot read the second disc, the NAV unit is bad. The handbook feature needs the disc inserted in the slot 1 of the CD changer unit.
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