I just installed my new appradio 3 and it will not go into app mode or let me really change anything in settings menu and i keep getting warning when I click on app mode and the parking brake....im wondering if its because me parking brake wire is not wired to anything?

Yeah sounds like it. I had mine setup on a toggle switch

Yeah sounds like it. I had mine setup on a toggle switch

yea i did the toggle  switch last night and now it works