When I turn on my wipers, they just hum and do not work.

I had that problem. There is a circuit board somewhere near or attached to the motor. It was flexing and causing problems according to temperature and humidity. I found the problem: a solder spot on the circuit board. I Fixed it and it came back. That board is a tight fit causing it to re-crack. Rather than buy one at a dealer, I soldered a piece of thermostat wire across the solder crack. Never had another problem in 10 years.