I have the same car with 6NH. I also am using the Cruzer Fit 16GB.
I took the USB drive out of the socket in the center compartment and now its not recognizing the drive when I plugged it back. There is a tick in front of the Aug-in input but the USB is grayed out.
It happened once before but sorted itself out the next time I started the car. Tried everything this time but no luck!
Have you come across this problem before? Thanks for your time.