As I was planning my 8.4 radio conversion, I stumbled upon this thread and knowing how much a pain it is to try to hook a gooseneck trailer up to my 2016 Ram 2500 crew cab, I decided to tackle this upgrade at the same time. My initial plan was to make a harness by buying the OEM tailgate back up camera harness (Part# 68189124AB) stripping it down just to the camera connector and then extending it across the top of the header and down the passenger side "A" pillar. How to strip it down can can be found on other posts on the forum, but basically all you need from the harness is the white camera connector.
Once I got the extended harness to the "A" pillar I removed the ground from it and spliced it into the ground of the header wiring harness going up the passenger side "A" pillar. The ground circuit there was Z911 and that is the ground that was called for by the CHMSL camera schematic.
I then proceeded to route the 5 remaining wires in the harness behind the glove box using then same route that I used for the conversion harness. I took the three video wires and pinned them into slots 24,25,26 of the C-1 radio connector. I know that all other posts say to put them into 21,22,23 but the schematic for my 2016 specifically said 24,25,26.
I then routed the remaining 2 wires (power and Lin Bus) across to the driver side where I thought I was going to splice them into connector I220. At that point I realized that I220 was actually not located inside the cab. I felt defeated lol. I knew I could get the correct Lin Bus CBC3 at the BCM but I didn't know how in the heck I was going to get to it and splice it and I didn't have a source for the F923 power circuit. I retreated and gave up for a few days, bought a few more days on tech authority and went looking for a new location for the Lin Bus CBC3 and the F923 power.
After a few hours of looking at schematics I came across connector I440 that is located in the "C" pilllar on the drivers side right above the seat belt. Low and behold it had both the F923 power and Lin Bus CBC3 in it and better yet they were not pinned coming out the other side of the connector. I realized I could pin two wires into this connector and run it up to the camera to finish my installation. Now only to find the terminals. I had dug through Yazaki catalogs, and eventually found that I needed terminal number 7116-4110-02. Both the power and Lin Bus required a 2.8mm terminal and not a 1.5mm terminal. I searched the internet and could not find anyone that would sell me this terminal in a small quantity. I relented and went to the dealer hoping they may have a couple or have a repair kit…. No dice. I had relented to the fact that I may have to splice the wires which I really didn't want to do. As a drove home from the dealer, it struck me that I had the remnants of my header wiring harness that I pulled out of the truck when I did my 8.4 conversion. I knew it was a yazaki connector. Sure enough a cross reference of the two connectors showed that they used common terminals. I depinned two of the wires, ran them from the I440 connector up to the chmsl, tore apart my harness at the chmsl, and spliced these two wires in. I then pinned the Lin Bus CBC3 wire into slot 5 of the I440 connector and the F923 power into slot 6.
Success finally…. Off to the dealer to get code "LPD" flashed so that the cargo cam button would show up on my 2016 RA4. No luck, that code is not available for my VIN. Once again, defeat. I called Chrysler and tried to plead my case, no dice. Only thing left to do, jailbreak. I decided to go with customtronix as they can just make the button appear on the screen for the 2016s. It was a really clean solution to me. Looked completely factory. The only thing that was wrong is that they expected the cargo cam inputs to be in slots 21,22,23 of the radio C-1 connector and mine was in 24,25,26. Right now it thinks it's the front cam, but I will get that fixed soon.
So in summary, this is the way I pinned my setup to make it all work correctly.
Camera Pin --> Terminated To
1 Z911 Ground --> Spliced to ground of passenger side A pillar harness (Z911)
2 Lin Bus CBC3 --> I440 pin 5
3 F923 Power --> I440 pin 6
4 Camera Shield --> Radio C-1 pin 23
5 Camera Return --> Radio C-1 pin 22
6 Camera Signal --> Radio C-1 pin 21
I have some pictures of the I440 connector that I will post as soon as I figure out how to. Hope this long winded post helps someone else out.