C5 wipers

[nzvette]

Hi , the typical is happening with my c5 wipers , they are coming on and off as they please , I’ve tried all the usual forum fixit things , like the udders under the wiper motor and they are clear , I’ve pulled the wiper motor out and it’s dry inside , not vision of any water being in there . So what I did was unplug the window washer motor and bam haven’t had any problems since , can anyone tell me why this happens.