There was a new twist in the toyota testimony reviving an old debate about what may be causing the run away car problem. toyota points blame at floor mats and gas pedals. but as dawn tongish reports, investigators are looking into whether every day electronic signals coming from cell phones and traffic lights could be the problem. >>... reporter: jonathan chair of the uta electrical engineering department says on board components like the car's own electronics may be interfering with the engines or brakes. >> as the systems become complex, sometimes it becomes difficult to test the system under all possible situations to determine if there might be a weak point in the system. >>