More likely some corruption in a region rather than a system file. The SL and LA [lane assist] indicators are read from map data. The JV images are read from the JCV file. Both the map IMG and JCV files are of course stored in the file system which is also a region itself [it's probably rgn83 in your device] however if both those files were faulty they wouldn't work in simulation either.

Try dumping rgn140 and open it in "mod2xxx" to see what is enabled there. I think your Navigator V is similar in firmware to 2xxx and 34/35xx devices so should have that region populated. [Only registered and activated users can see links. ]