Everytime I hit a bump my dash dings that rear door is open then goes away , hit another bump and dings rear door is open , where is the signal coming from on the rear door thanks

 

I believe that is within the latch mechanism itself inside the door. The mechanism is a single unit that is the latch, power lock motor, and sensor. Driver side part #15816390, pass side #15816391.

Might just try spraying some electrical cleaner in it from the edge of the door though and see if maybe that fixes it. Could also be a wire breaking off (just the insulation holding) in a connector as well which might be at the latch or maybe the BCM (deep behind the headlight switch) or another connector in between.

This site gives good diagrams and part numbers. https://nemigaparts.com/cat_spares/e...n/16/tn16-061/