Central locking problem HELP

[cornish6544]

My central locking didn't work when i first bought the car 2 years ago but was easily fixed by a second hand central locking box. Now it seems it has gone again only this time a new box hasn't worked. I first realized this after i had finished soundproofing the doors and when i finished for the day i locked the car. When i came back to it in the morning i opened the rear right door to get something out the back and the alarm started going off however the drivers door remained locked so i thought i have maybe done something while soundproofing the drivers door.

The connection to the central locking box located under the passenger footwell has corrosion in the box and on the end of the connectors of the wiring so i got a replacement box and new connectors on the end of the wiring yet still nothing.

There seems to be a wire that runs inside the door that isn't getting power but i don't know if this has anything to do with central locking. I will add picture of it below.

It has always been abit temperamental like if you slightly moved the box the car would unlock or wouldn't work again till you moved it again yet now i cant get anything out of it.

Have checked every fuse as i didn't know which one it could be and nothing wrong with any of them.

This is a pain as I've spent a day trying to sort this out and got nowhere does anyone have any ideas? The drivers door is the only one that locks and unlocks. The picture below is a wire i found plugged in but doesn't seem to be getting any power.

[Linx]

Have you checked the fuses?

 

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[cornish6544]

yes checked under drivers footwell and under bonnet all are fine

[johned]

Bad or broken connection test with a volymeter.