One problem related to wiring has been reported for the 2006 Toyota Matrix. The most recently reported issues are listed below.
On October 3, 2008, while driving my 2006 Toyota Matrix I had to accelerate rapidly to merge onto a busy street. I immediately smelled a odor coming from my vents of burning wiring. My check engine light came on. I pulled over and made some calls to service stations and the Toyota dealership. Was advised to take it to the dealer. Did. After investigating the issue for several days they decided my ecm was bad and replaced it. With the recent Toyota recalls, I finally decided yesterday that I should check into if I am involved. My vehicle is Toyota certified and they do have record of the ecm failure to my vehicle. I also wanted to report it to you folks, just in case it is in fact the computers that are faulty. It is unknown to me whether the replacement computer they put in my car is a 2006, or what year ecm it is. My ecm failed immediately after rapid acceleration and my vehicle is not on the recall list.