Two problems related to wiring have been reported for the 2007 Toyota Prius. The most recently reported issues are listed below.
Driving on a rainy day, abs and vsc lights on dash came on. My car violently fishtailed almost 180 degrees, back and forth 6 times on a curve getting off a freeway (about 45 mph) nearly crashed. I proceeded very slowly to side street. Car shimmied to right making a left turn. Felt like I was driving on ice. Called a tow truck. Dealership found rodent damage to wires to wheel speed sensor. I discovered manufacturers using soy oil on wiring. $1300 repair.
My 2007 Prius started having right headlight failure when I would drive on a rough road it would turn off then back on some 6 months ago. My husband checked the wiring and it came back on. The car had 45000 miles on it at this time. About 3 weeks ago both of them started turning on and off and 2 nights ago while driving home I had to turn them on and off 22 times and they would come back on and then get dim and then turn off. I took it to them at the dealership and they stated the left light was bad and the light and ballast were replaced for the tune of 614 dollars. They did nothing for the right light. I called and opened a case with Toyota who will not pay for ay of it. This should be in a recall!.