Brake Light problems of the 2015 Honda Odyssey

I purchased this vehicle (2013 Chevrolet cruze) in 2016 and it had mileage of 3,500 miles. Less than a month of ownership an alert showed and sounded in the dash lights that the rear driver's side door was open when it wasn't and this was while in a park position and while in motion on any road. The alert was almost constant so I brought it to a repair shop which replaced the latch in the door 3 separate times and the problem still occurred. Eventually I asked to just have the latch disconnected in the door because no one could fix it and stop the alert and sounds from going off. So now I have a $300 latch disconnected inside the door because that wouldn't fix the problem plus I have to manually lock and unlock that door if I need to use it when all of the other 3 doors can be electronically locked/unlocked with the fob or the lock/unlock button in the car. Now a new problem that is currently going on is the rear brake light in the back windshield is very dim while in a park position or while in motion driving on any road. It still works but is not as bright as it used to be. It's a light bar that sits in the back window acting as a 3rd brake light and it does not contain light bulbs. Also, I've had a couple of other alerts show up in the dash for a day or more while in a park position or in motion driving on any road and then they go away after a few days. I suspect this vehicle has an electrical problem and I can't afford to have it diagnosed.