@Wayne Cooper
This is correct.
2013-15 RAx radios ONLY SUPPORTED both camera inputs officially on a SW version 17.11.x
Earlier versions only allowed one or the other and if you had both from the factory, you got the BuCam on mirror and Cargo Cam on radio.
** There was a 'fix' to swap the camera video inputs around for the 17.11.x version (& buCam Reroute harness to the radio from mirror) ... But later updates to v18.x. reverted it for some people to previous setup (1 input only).
------ v16.x.x (with both cams) -----
Cargo Cam on pins 31,32,33
BuCam in Mirror
------ v17.11.x (with both cams) -----
BuCam on pins 31,32,33
CargoCam on pins 24,25,26
----- v18.43.x (OTA update... Allowed both for some. Not for others!?!) ----
BuCam on pins 31,32,33
CargoCam on pins 24,25,26
----- v18.45.x (1 input only) ----
BuCam on pins 31,32,33
>> or <<
CargoCam on 31,32,33
If you have both, enabled you get this (what FCA expects officially)
Cargo Cam on pins 31,32,33
BuCam in Mirror
** You can swap the inputs between 31,32,33 & 24,25,26 to get the BuCam on the radio (but you must disable cargo cam).
Your other option is to install a 2016-2018 ram 8.4 radio that supports both inputs (currently)
---- see also ----
INFO - 2013-2017 8.4AN FW Notes (RA4/VP4 NA).
And especially....
Post 51 from the DIY BuCam Install thread.
.
M² Mods.