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I would bet on the liftgate module (LGM) It controls all that stuff back there,wiper,defrost,gate ajar light,gate lock and unlock ect. Might try wiggleing the wiring boot where the wires go from the body to the gate,if it changes anything,bet on a broken wire inside that boot.
If not the LGM is my first thought.
The lift gate activates a contact. This contact must be integrated in the frame of the lift gate. The contact does not switch.
Either it has to be adjusted (mechanical in right position) or it is defective, then you have to replace it.
Regards Mike (Germany)
sounds like the cold temps cause the metal door to warp which causes an increased distance to the sensor that tells the computer the lift gate is open. The lift gate sensors should be adjusted to be closer together.
open the gate above the latch is a small 4x8 panel pop it open with a small flat head screw driver you will see two plugs one with two green wires and one with purple +black wires unplug the plug with purple + black the other is the power lock may need a a T 27 bit to undo the latch to get to the plug easier