Thread: Wiper Problems

That pulse control board is an item that commonly fails. From your description, its possible that the combo signal /wiper / cruise switch could be it. When my board went bad it was just the delay that was affected, but your situation may require more detective work because it sounds like the whole system loses power momentarily. I'd be curious what they did at the shop that made it go away. Its possible they re-did some solder joints on the board and now they came back loose. The aftermarket replacements are re-designed with a thicker board. But the location of the component is such that moist air can kinda get to it, so theres no wonder they go bad so often.

Pulse board is underneath the wiper motor, its mounted to the bottom of the wiper transmission assembly and that has to come all the way out before you can see the board or even unplug it, really. Pretty tight squeeze getting the assembly out of the cowl, I have had to bend metal a little in a spot to get it out. Fairly simple operation though, easier if your car has a two-piece cowl. I went back together with one of those, off an 02 model. Finding the problem was easier for me because I had a parts car and trial and error was no issue. Glad too, because the combo switch is a bigger job. I swapped the whole wiper assembly and that fixed it. My symptom was it would cycle only once on delay, then they stay up but didn't cycle again until switched on again. If you search, theres a writeup here someplace. Remove wipers, cowl, wiper motor shield, wiper trans ass'y in that order and go from there.

Sounds like somebody has been messing around with wiring or fuses in that other car, I'd pull the hush panel and look for funny business around the wiring to the steering column.