F150online Forums - Windshield wipers won't work.

I have an'02 F 150.A couple weeks ago my windshield wipers got stuck and would not work.I was parked and got out to shake them to see if they would come loose.When I opened the door the alarm for the keys in the ignition went off even though the keys were in my pocket.I put the keys in and turned the switch a couple times and the alarm went off and my wipers started working again.Last weekend the wipers got stuck while operating at low speed and worked a couple seconds on high speed and then not at all.They still don't work.We checked for blown fuses and cleaned the switch and still nothing.Any ideas would be greatly apprieciated.Thanks