Driver's Door Lock Not Working with Key?

after the last attempt of having to opening the boot and jumping in to reach across to put my key in the igition to re-sync, i think now's the time to ask for help. Whenever my keyfob decides to stop working (Checked battery and it's fine) i cannot use the key in the driver's door to open or close it. I took the barrel out and it's connected directly to a white plastic gear. After reading up i'm unsure if it's an issue with the the actual door lock assembly (microswitch) or the driver's door wiring loom. Has anyone come across this before or can point us in the right direction or is there a wiring diagram for the door loom knocking about?