Toyota knew of window switch failures years ahead of recall
According to a variety of sources, documents filed by Toyota with the National Highway Traffic Safety Administration pertaining to the new power window switch recall indicate that the first incident relating to this recall was reported in September 2008 in the US. This early complaint stated that there was heat damage along with an unusual odor coming from the power window switch and after the part was replaced, Toyota returned that component to the supplier to be looked over but no problem was found so the automaker dropped the investigation into that particular case.
Fast forward to May 2010 and Toyota finds that they are receiving more complaints about the “sticky” driver’s side power window switch along with issues of heat damage. Unlike the 2008 complaint, these new complaints in 2010 indicated that there was smoke coming from the switch as well and at that point – Toyota launched a full internal investigation into the problem.
Toyota then spent the next two years trying to figure out what was causing the problem that lead to the overheating and smoking window switches with the solution coming in August of 2012. Toyota found that the manufacturer of the power window switch, Tokai Rika Co, had changed the way that they lubricated the window switch during manufacturing – transferring from a spray-on lubricant to one that squeezes on instead. The problem was that this new squeezed-on lubricant could have been applied unevenly and over time, that leads to the grease no longer being effective. Once the grease has stopped doing its job, the window switch would become “sticky” in its movement. The bigger problem was that when owners took these Toyota and Scion vehicles to dealerships or other mechanics to have the issue checked and repaired, technicians were applying a traditional lubricant to fix the sticking switches and Toyota found that the improper grease could actually lead to a fire in the door panel. Since the cause of the fire risk was found to be caused after production, they ruled that portion of the problem to be "external factors." It should also be noted that the manufacturer of those troublesome window switches changed their methods of lubrication in 2010; effectively putting an end to the problems on new vehicles from there on out.