fix
I don't know if you or anone else is still having this problem, but mine messed up and started doing the same thing about 2 weeks ago. To me, it didn't make any sense for it to be the switch because it wasn't intermitant. Most of the time a variable switch will only go dead in all positions, or one or two...Also, I knew from older style wipers (Mustangs, Thunderbirds and LTD's) the high setting is both windings of the motor, if the motor was bad, the high setting would work at half speed. My radio didn't start right up on Monday and I just dicided to see if i could hear anything. I heard a click inside the dash when I turned the wipers on. Inbetween the Steering Column and the heater controls and just above the annoying door chime is the control box. I broke this loose from the dash(as it was much easier than trying to take the screws out) and brought it in the house to inspect. The cover is easily removed and a printed circuit board is inside. There are several Resisters and Diods on the board as well as the Relay. I examined the resisters and diodes first due to the smell that came from the box, but all of the componets physically looked fine and from that smell, normally there will be physical signs of burning on the componet. I flipped the board over to examine the traces to see if it was something i missed. One of the solder joints was gone from the relay. I just simply re-soldered the connection and now they work like a charm. This board has simple componets. I will try to get a schematic of this board and post it at a later date.