Dm2652lbx will only run if interior light switch is on or dining slide and bathroom lught are both on. same for gas only or auto position

The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground at G401 with the switch in the ON position.
The following lamps may be manually turned ON by placing the interior lamp switch in the ON position, or by opening a door while the switch is in the AUTO position.
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The dome lamp

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The liftgate lamps

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Courtesy/map lights

You can't turn them on manually ?
This could be a BCM problem , this best left to a ASE certified repair shop or the dealer .

Most likely the problem is a leaking drain pipe in the wall, perhaps because of a failed joint. The reason it's not going down the wall to the floor of the dining room is because there is a top plate on the wall. Most likely the water is running down the bathroom wall, then out over the dining room drywall ceiling. It is finding the lowest spot in the area to accumulate and is soaking into the drywall. Since it is drain water, it is dirty and is picking up additional contaminates from the wall and causing the brown stain. It may or may not be soft, depending on how much water accumulates at one time, but it is slowly breaking down the ceiling where the stain is.
That said, are you sure it's a leak, or are you assuming that since you see the stain on the ceiling. I say this because mice, like many other rodents, usually pick one location to use as their bathroom. If you have mice in the ceiling and this is where they do their thing, you will get the same type of indication.

It's very likely that you left the interior switch in the on position. There are usually 3 positions the switch can be in "OFF, ON , and AUTO. The switch should be in "AUTO" so that the interior light will turn off when you close the door.

There is a slide switch on the overhead console. It has 3 positions, on, off and auto. Slide it to the auto position and, if the switch is working, that should solve your problem.

The N611 will flash 3 times as an AC heater fault. If your AC heaters are ohming out properly (48 ohms of resistance), then you have a bad power board. If the AC heaters are not showing around 48 ohms of resistance, replace the AC heater. It's going to be one of the two. Here is an article on it:

Norcold Fault Codes AC HE or On light flashing 3 times What to do

Could be the front electronic module. The module has a timer that holds the lights on for about 60 seconds after you exit the van.

i have a dine auto-exposure macro- light, not the same model but its batteries are accessed by adjusting the control unit from an angled position to straight. Then the front of the control can slide up/off and you can access the four A4 batteries. Hope this solves your problem.

Interior lights: the dimmer delivers from 0 to 80% of the total power to the controlled bulb. There is a little switch included. If you try to slide the dimmer over the upper position, you hear a small click. This is the "full" position. This switch controls the int.lights too if your doors closed and you need the lights.
Ext.lights: vehicles equipped with DRL (Canadian Cars) and "AUTO-Headlamp" switch have also a dimmer how is controlled by the daylight. This one delivers 80% power continuously till it's dark enough to switch in full mode.

What sort of light is it , dimmer switches normally only work on Incandescent type lights not flourescent type.

Otherwise it sounds as if the dimmer function is faulty.