Opel Meriva B 1.4 Turbo 2010 - Tailgate Unresponsive to Remote Control

Hello,
I have a problem with the tailgate.
Does not open with remote control.
When I click on the key all 4 doors close / open and the tailgate does not.
For now, I checked the fuses (those on the driver's left leg - 6, 7) look functional.
Friends say that it may be a frayed cable in the bundle in the upper left side of the boot lid, however: I can open the fuel filler flap with the key, the washers and the rear wiper are working.
When I want to check this beam - I don't know how to open the tailgate. In the middle in the door I have no hole, just what, it is visible the place where the lock clamps the staple (at the lower frame).
There is no lock in the trunk lid, only the button under the strip in the middle of the tailgate.
Thank you for your help,

Get to the car from the inside to the trunk, remove the upholstery and open mechanically. Only then and then determine the cause. They prompt you about a damaged beam in the flap.