I just recently installed a Pioneer AVIC-w6400NEX in my 2018 Ford F-150.  I replaced the small 4.2 screen.  I used a PAC RPK4-FD2201 install kit.  Everything is working fine except my backup camera.   It’s just a dark screen.  I have went through the settings on the 6400.  I’m positive I have them set correctly.  When I installed the PAC kit,  their harness had a red/white wire coming off of the harness.  Their legend for the wire said 12v+ Programmable Output.  I did not hook this wire up because I wasn’t sure of it’s purpose and if it should be hooked up to a solid red wire. Here’s a link to their PAC’s install directions.  Any help would be greatly appreciated if you think this is why my camera is not working.   I’m not sure where the backup camera gets it’s power from.  Thanks!

-Bill

Radio purple/white goes to purple/white on interface for reverse camera.

I do have the purple/white to purple/white.  I don’t have the red/white connected to anything. I’ve watched some videos where they splice in a red acc wire so the camera is constantly on while the vehicle is running.  

-Bill

Red acc to camera power allows the radio to go into rearview camera while driving. Like you wanna see what's behind you or when towing something.