HiAll

My rear window wiper has failed and was wodering what the commonest causes might be?

I doesn't get used alot but the Mrs used it the other day and it rained.

The blade arm stalled whilst on the window and would not budge.

I have removed it so that the tail gate can open and close.

With a little persuasion the arm wold move abit but when trying again it would stall back on the window.

Would the fault be in the motor or switching?

Thanks