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Hello everybody

Got a VW passat 2014 TSI 1.8T , after battery replacement nav unit (radio, Bluetooth, camera, navigation, cd, phone etc) stopped working. left a car at the dealer for 2 days, they run diagnostics for 2 days couldn't found a problem. It shows problem code but when they trying to go deeper it shuts down tester or computer (as dealer rep told me). Quote me replacement nav unit about 3850$ , but no guarantee that it will work after replacement, since they still do not have understanding what is going on. does anybody had similar issue ? what is might be besides nav unit? Fuses were checked and they are fine. voltage was checked as well. everything looks fine besides nav system is dead. and they can not confirm that changing nav unit will solve the problem.

Thank you,
 
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