my MFD was working perfectly (2005 LX470) until I hooked up a trailer brake controller. Now my back up camera,, NAV and Grom Vline are not working. When I start the vehicle the navigation welcome message does not display. When I put the car in reverse the MFD screen is just black. When I hit the map, destination button on the side of the MFD they don't beep. I have removed the brake controller, checked the fuses, I ran the system diagnosis and the nav shows okay. Any thoughts would be appreciated. Thanks