Truck thinks door is ajar, but none are! How to diagnose, drains battery

[Mayhemqx4]

Hey guys, I bought/traded for a 2001.5 infiniti qx4, very nice and clean car, literally just had a used engine and transmission put into it by the previous owner who I know, the truck has an issue where the battery seems to drain very fast though, within a day it will be dead. I notice the door ajar light is on though, even though all doors and trunk are closed. I even walked around the car openning one door at a time and manually pressing all the door sensors to closed and the light never went off, the truck does not have one of these sensors as far as I can see though, so maybe its something back there.

I also noticed the interior light doesnt come on when you open a door, but I figure that must have something to do with the door ajar light, the car also has an aftermarket "middle" light about the back seats, it an LED bar manually operated by a switch, but I just keep it off, im not sure if anything or what was in that spot from the factory, but id imagine its the front overhead console that should be lighting up...

If I could get a little help diagnosing this Id appreciate it alot, it seems to be the only problem with this beautiful truck. I have downloaded the FSM for the year and model, but honestly cant understand much of the language or diagrams, there just beyond my knowledge

Thanks so much!

[fueler]

I'd download FSM off this website and use wiring diagrams!

LED bar on ceiling with switch, scares me.. Problem may be right there.

You cannot diagnose this without wiring diagram, i'd also bypass the door switches one by one but I'd start with the custom wiring in ceiling.