I turned on my rear windshield wipers for my 2003 BMW X5, and they stopped working in the middle of a swipe. It has been getting stuck and lurching forward and then stopping and lurching forward for sometime now. Ive heard that a jam protection could come on if that happens? I checked like 10 minutes later on just battery power, but they didnt work. What else could it be, and what can i do at home to save some money.