I added an external aftermarket sub to my system (shaker 500)


Wired up sub and hooked Head unit back up


Following conditions existed after startup


1. Error on start
" Navigation Fault

A system Fault has been detected that may cause the Navigation to perrform abnormally. Please contact your Dealership. "



2. Could not change time
3. Nav did not work and placed map in Detroit (at Ford HQ)




Fix
The antenna for the GPS system was disconnected. Re-connected and system functioned properly

 

THANKS CRAIG