Wipers not. Working on bmw x5 e53 possibly could be anything
But I've checked the entire system by spraying contacts, had to open the relay sprayed it with lubricant oil gave a little bit of a tap to make sure its not stuck.
Then removed wiper switch checked in the inside for any corrosion.
I have also ordered a new motor with set of new link arms as this could be an issue with pulse board before the motor or motor itself for reliability I've ordered a new set whist the old one will be repaired.