Picked up my 2014 wagon last fall. The backup camera quit working about a month ago, showing the "backup camera not available" message.
I found that the camera fuse, F29 in the auxiliary panel at the right rear side, was blown.
Replacing the fuse resulted in an immediately blown fuse upon powering up the van. This tells us we have a hard short somewhere in that wire.
Picked up a copy of the wiring diagrams to see if I could troubleshoot the issue. The power runs from fuse F29 in the right rear, up to the front of the van, crosses over, and then runs down the left side to the Image Processing Module above the left rear wheel well.
If your van is like mine, and does not have parking/collision sensors, this is apparently a single continuous run of thin blue wire! This might be one of the longest runs in the van. Finding this short would likely require disassembling much of the interior.
I was able to rule out any issues with the wiring between the module/door hinge/camera by unplugging the connectors for these. I would still blow a fuse in all scenarios.
Since I could easily see/access the thin blue wire at the fuse panel and module connector, I decided to just create a new power run that goes under the trim panel at the back doors. This has successfully fixed the issue, camera is working again.
I'm still using the 5A fuse in the panel, and used a 16ga wire, which is much thicker wire & insulation than the original. I don't think it will get pinched under the trim panel, but we're fused so I'm not worried if it should.
Connections at both ends were done with solder and shrink tubing, so this repair should be good for quite some time.
Repair pics show the insulating blanket that I've used for sweat soldering copper plumbing. I didn't want to risk melting any trim panels with solder drips or the heat gun.