Is there any damage inside the rear ? Since the battery and fuses are located there it might be that some of the fuses have been dislodged - try re-seating them. Also check the battery terminals are secure. Worth a try though possibly unlikely. Other than that it's outside my level of experience.

Did you check that the blue/white wire was not broken under the insulation? Alternatively check voltages on the connections to the diversity unit. If you can get access to the circuit diagram it should be possible to try and figure out if it is a lack of power to the unit. I think the brown should be 12v.

 

Finally found the problem, it was the #59 fuse (5 amp).

When I fixed the wires on the tailgate I think one of them was the blue-white one, but probably due to 4 other wires were damage on the same place there was a shortcut and broke the #59 fuse.

I checked at least 10 fuses related to the central locking and diversity, but none of them was the 59.

Now the remote control is working perfectly, but the Bluetooth still not working, don´t think the bluetooth problem has nothing to do with the tilgate wires, right?