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I pressed it nothing happens , I pull it off and there is nothing connected to it, can see a cable behind routing through the empty trunk panel space .
It is an emergency trunk release.
If the power fails pulling on the tab will pull on the cable which will release the trunk latch.
If the cable has worked its way out of the tab
you may be able to put it back.
If not a service center or mobile technician will be able to fix it for you.