Well I've checked the wiring harness and the ACC, as well as I have taken the vehicle in quite a few times. The drive is working and clean. but my Navi just has a mind of its own. it randomly restarts and some of the restarts make it ask for the pin # like when the unit looses power. I have checked the power + and - for good connection and it is. Dealers cant find anything wrong, neither can I. it also like to download updates like when the unit first gets power. it lingers on the boot screen sometimes and sometimes just never boots. Any Help would be greatly appreciated. I'm halfway tempted to retrofit a after market nav into its place, but im not sure what to do about the climate control and a few other features integrated into the nav system.