Rear wiper problem

Hi guys, my rear wiper has starting to play up, its always been fine before but now if i activate it, it will only move to and fro about 2 inches then it will park itself again, it does not wipe the whole screen like it did before, same if i go to wash it... any ideas gratefully appreciated.

Is it tight on the taper shaft?

i believe so but will double check in the morning, i know i can physically move the wiper from parked position to complete position, don't know if this is normally the case.
typical it breaks in this weather lol

It shouldn't do that - something has given up! Hopefully Its a simple tightening of the arm - I think you may have to take off the wheel bracket to get to it properly.

Hi again, ok so this morning I took the wheel brace off and I took the wiper arm off completely and pressed the wiper button and the bezel moved then I put the arm back on and tried, again the bezel moved but the wiper itself only moved about 2 inches again. Completely confused. Any other idea's...

Yep the arm is broken - if I remember any crack or part missing causes it to slip - I had this on mine - changed the arm - about £15 or less. Problem solved.