that's odd because My Mark 8 did that this morning but I'm not sure if its because there may have been ice around the armature. The odd thing is that it would intermittently work if I played around with the switch. The really odd thing is that if I hit the windshield spray button and it didn't work, I'd play with the multi-switch, then all of a sudden (with everthing off) the wipers would start going through the motion as if I sprayed wiper fluid!