OK, I am home now and finally had time to look for the camera connections.At this time I can safely say that there are NO connections for my camera anywhere under the dash.
Here is what I have found however. I suspect I have an aftermarket camera. Lets see what you all think.
The cable to the mirror is routed into the headliner just forward of the drivers sun visor. Pulling on this cable to remove it slightly disclosed the presence of a miniture multi-pin connector. (Checked and reseated this connector to no avail)
Gently pulling on the cable it can be heard to be routed over the window on the driver side, then down the pillar just behind the driver.
It emerges from the pillar at the bottom where it is joined by a ground wire and a 12 volt wire emanating from under the driver seat. (interestingly the 12 volt wire is tapped into an existing wire further supporting the aftermarket theory)
The black cable then disappears through the floor and runs under the chassis. It is next to impossible to follow the route with out a lift.
At the rear of the rv the camera cable can be seen coming down from the camera location and dropping vertically. this can be seen via an access port in the rear storage compartment. the cable then emerges under the chassis and again is hard to follow, but it is unlikely that any control electronics are under the chassis.
I have located a very similar looking mirror mounted monitor online and the wiring diagram for it is attached.
Based on this I beleive that there is no junction box but the cable itself contains all of the necessary connections and the electronics are all in the mirror.
Having said that, my next step is to trouble shoot to decide if the problem is the camera or the monitor.
I have removed the trim piece over the driver window and can feel the cable which is routed into the headliner and then down into the pillar.
Next I need to gain access to that pillar behind the drivers seat. I suspect that the cable from the camera and the power and ground connections are made at a pigtail inside that pillar.
At first glance it looks like I have to remove the padded trim piece that faces rear behind the driver seat.
Before I disturb the trim, I was hoping that someone could confirm that this is indeed where I will find the connections for this camera and offer advice on gaining access to the space in that pillar.
Once I get in there I should be able to connect another video source (it should have a composite video rca connector), switch to av channel 2 or try connecting to another monitor of some kind.
2011 Solera 235S