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I only ask because I had a similar issue (mine was horns, not wipers, but both run through the TIPM where they have relays sitting). My horns would just go off, whenever, wherever. I thought it was the TIPM, when it was nothing more than rust/corrosion buildup. I cleaned all the ground connections around the battery box with a wire brush and dremel, and reconnected with white grease. Replaced both horns (cause those factory ones were just not worthy of being reinstalled) but utilized the factory bracket for the new horns. Cleaned the bracket to metal, matte black paint, rescuffed the connection points, and installed with white grease. And haven't had a single issue since. I hope your issue is as easily resolved as mine was. But it is at least worth looking at...
