Originally Posted by onehundred80

With four plugs and umpteen wires I would imagine that there would be more than one wire with a lock signal in it.
I have basically run out of ideas and as the OP cannot spend too much time on it and maybe not have the tools or inclination to do the job anyway I see this thread going on till Xmas.
Looking at the module is a must I think to prove or disprove the fault lays there. I leave the problem to you.