CENTRALIZED CLOSE CORSA 2003

Hello, my corsa presents the following failure:
When the doors are closed with the key the system does the system but the right back door does not close and I have to close it manually, the strange thing is that sometimes it works and other times not, I have checked fuses I have reviewed the driver's door thinking that there is the fault, but it remains the same, I am still the same, I need to disassemble the door that does not work but I have not done it since I do not think the problem is not there Where is the famous module, if anyone knows the fault would be grateful.

Disable the rear door and look at the wire that affirms the vcentralized closure that is squeezed with a screw, that normally releases or the wire breaks and you have to re -approve it, but according

It is correct only to regulate that pernito and already, it usually happens above all in the corsa