Here is a PM I sent Griswald regarding how I changed my sideview cameras on my Seneca. I suspect many Jayco motorhomes work basically the same way, so this may be of benefit:
Originally Posted by MrJackSprat
Hey Griswald, once you figure out how to disable the side cameras, let us all know. We too find it more of a distraction/selling feature than a real driving aid.
I see in a thread you were wondering how to disable the side view cameras. I also found them mostly useless, here is how I addressed the situation. Although I have a Seneca, I suspect the system operates pretty much the same across the MH spectrum.
I removed the radio/nav from the dash and identified the camera feed. Followed that back and stuffed in the rat's nest of Jayco wiring behind my dash I found a module that had the three camera leads coming into it. Surprisingly, all had a label identifying which camera they were from. In addition to the actual video wires there also were "trigger" wires coming to this module marked "right, left, and rear". I probed them with voltmeter while operating turn signals and placing in reverse. Each generated a positive voltage when energized.
Once wires were identified I then installed a DPST (double-pole, single-throw) switch in my dash and then cut and spliced extra wire leads onto the two turn signal feeds. So the wires come from the chassis, go to the switch, then come out of the switch and connect back to the switching module. You need a double-pole switch to keep the two leads isolated from each other.
So now when I activate the switch (turn it "off") no changing of the view to the side camera. Reverse still functions as it always did. Now I can have the rear camera displayed continuously and signal a lane change without the picture being interrupted. I can watch the merge to make sure nothing gets in the way. But if I do want to see a side view from a camera I can make it happen just by flicking the dash switch back "on".
It really wasn't that difficult in the end and I am very happy I did the mod.