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Whether you open the trunk with the key cylinder or with the remote, it turns the same pivot to pull the rod that releases the latch. Unfortunately, over time the lock cylinder pivot starts to corrode- being aluminum, it gets white and powdery- and it will stick. So then either the hatch will not open at all, or it will open and stick with the rod pulled, and not allow it to latch again. You would need to get a new lock cylinder assembly and the pivot that attaches to the backside of it.