I bought truck with AVIC-D3 installed. I have msg on screen that says improper detection of parking brake. Cannot access some of menu options. Nav menu, clock settings,etc. Any help?

Your parking brake wire is just grounded, which doesn't work for AVIC's to allow them to watch video, the mute wire also needs to A ) be moved, and B ) also need to be grounded

go here

http://avic411.com/index.php?/topic/3926-avic-d3-bypass-with-picture/