after a long time of looking for the problem as to why my rear wiper would only work when it wanted to
on my xantia S2 Estate.
if you remove the motor unit and then remove the blue relay prize off the housing of the relay and turn the PCB board on the
bottom upwards and look at it with a magnifying glass jiggling the board back and forth may well reveal broken solder joints
where the relay pins connect to the board, solder the joints again and put it all back together.
I had a spare relay from the scrappy which was broken like this and so was the one in the car, I soldered one of them put it in
the car and the wiper works beautifully now I also think it had something to do with the connections on the rear door lock mechanism as this is not sticking anymore like it use to. I couldn't find the fix on here so I thought I'd post it anyway.
regards Nigel.