Hi team,
For those of you who are experiencing software glitches or other Nav system malidies, doing a master RESET on the system may eradicate this problem. Open the hood and the main fuse/relay box. Now locate the fuse that is labeled: RAD 20A This is the main fuse that allows the nav system's memory to operate. Like your windows laptop, there are also temporary files and history logs stored in the system's cache and hard-drive.
Pulling the main fuse and leaving it out for a MINIMUM of four hours will delete these broken, corrupted files and restore the firmware back to it's factory default settings like when the truck was new! ...remember: it needs four hrs minimum for these bad file to be deleted. You can still drive the truck, you just won't have use of the head unit for that period of time! 'Best to you',
rig