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When I took out my factory NBT2 from my 2015 228i xDrive, the GPS Arial on the head unit had nothing connected to it.
It seems like the GPS Signal comes from the Ethernet connection on the ATM module. Have you tried disabling these parameters? They were set to Aktiv on mine. Perhaps it will allow you to fail over to the main antenna on the head unit instead.
ADAS_GPS Nicht_Aktiv
GPS_FROM_NAVI Nicht_Akitv
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