Testimonial: "Thanks its the first time posting on here. Can you please advise where I can get that illustration as its very blurry"
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check for power at the wiper motor if you have power when the switch is activated if you have power there the motor needs to be replaced. if you have no power change the fuse and check again for power when the wiper switch it activated there is a relay that will cut out if the wiper is frozen to the window but unlikely that this will be your problem 9 times out of 10 the motor is gone.
Some wiper arms are simply a push fit onto the drive shafts and some have a nut securing them on under a cover which has to be lifted up first. Try lifting up any plastic covers on the base of the arm at the windshield. If it looks like there is no cover then the arms are held on by the force of the springs and by a taper on the drive shafts and if you lift the arms off the windshield and gently rock them as you pull them away from the vehicle they will release..Just make sure that before you refit the arms that you run the wiper motor and allow it to self park as I have seen wiper arms remove paint when they have been dragged off the windscreen and over the paintwork and the wiper motor is easily powerful enough to cause real damage..
Locate the motor, check if it is getting voltage when you turn it on, by probing the connectors. Another possiblity besides the motor is the motor control which control its speed. Newer cars usually have an electronic package located by the motor housing. It has a thermal fuse, that sometimes look like a resistor, that blows. and it looks like part of the circuit. Soldering tool is required to replace that. You can also check the motor by hot wiring it, but make sure it is disconnected, and isolated before performing the test. Otherwise you could fry up some electronic device.
Nut came loose and now has stripped the cone shaped wiper blade driver. replace the cone and replace the wiper in the correct plase and tighten the nut down. If the wiper does not work make sure the wiper blade is not stripped as well.