I need some help with this please. I have search but have been unable to find any posts in regards to this particular issue.

2004 v6 prado with remote locking and drivers door is the only door with a key barrel

The rear door won't lock at all with the key remotely or via key in drivers door

I can lock it manually with the lock/latch in the middle of the rear door and upon locking it I can then unlock it via the remote key and key in door.

I have attempted to reset the remote lock as found in PP but to no avail

I pulled the rear door trim off ( and yes I broke the clips) and was able to find that there was not switched power on any of the 6 wires at the plug going into the lock when the lock button was pressed. Despite this 2 wires have constant power, 2 have constant eart and and the 2 large wires have power when the unlock button is pressed. Not sure on the theory of operation or what is ment to have power and when but some help would be appreciated

Jamie