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If post #9
used a used latch then likely the same problem (dry of grease) still exists. The door physically being opened to let the trunk then work says the latch there IS the issue, the ground is not completing. A quick check would be to sort out the ground wire color there and ground it by itself at the latch connector to see if the latch then works.
The power pathway there is pin #30
of BCM > trunk or hatch latch > front door latch > to ground.
For what it is worth, if the wire is broken say in the door hinge area due to constantly flexing around, well, that can do it too.
Last edited by amc49; 01-15-2019 at 08:43 AM.