Tourer - Rear Window locked shut

What started with a task to replace the rear wiper motor has developed into a major problem for me. When I first closed the rear window, the lug did not engage with the hole in the moving plate on the motor assembly. I then found I could not open the window and established that the locking mechanism for the window had activated and was not disengaging when the key was pressed. Think I would take the motor back out again, I find one screw that can only be reached with the window open (I now have a chicken/egg situation). Thinking that I could detach the locking mechanism from the wiper motor assembly, I found I could still not remove the assembly from the car. Now the real issue is that I notice that the wires the provide the feed/signal for the locking mechanism had come out of the plastic holder and I do not know what order they should be – this item may the cause of the failure to unlock in the first place. I have two immediate questions;
1. Which wire goes where (see photo)?
2. Is this locking mechanism easily replaced (if I could get it out) ?