Some Toyota Model Sales Halted Over Seat Problem Toyota has told its dealers to stop selling about 36,000 vehicles of its most popular models because a component on the heated seats does not comply with a federal safety standard for flame retardants, the automaker said on Thursday. The affected models are the 2013 and 2014 Avalon, Avalon hybrid, Camry, Camry hybrid, Sienna and Tacoma, and the 2014 Corolla and Tundra. Toyota has received no reports of fires and is asking the National Highway Traffic Safety Administration not to require a recall of vehicles already sold, and instead rule that the "noncompliance is inconsequential to motor vehicle safety," John Hanson, a spokesman for the automaker, said in an interview. Such requests are not unusual and prompt a lengthy investigation by the traffic safety agency. If the agency rejects the request, Toyota would be required to conduct a recall. Mr. Hanson said the automaker was still calculating the number of the vehicles that had been sold. Under federal safety regulations, when an automaker conducts a recall it must tell dealers to stop selling those vehicles. But Mr. Hanson said it was not unusual for Toyota to tell dealers to stop selling vehicles to make improvements that fall short of a safety recall. Toyota will change the heating component on the unsold vehicles as well those at assembly plants. While about 36,000 vehicles are already at dealerships, Mr. Hanson said an undetermined number were on the way from assembly plants to dealerships. Sales of those will also be stopped. The problem was discovered by the Korean safety agency, a counterpart of the N.H.T.S.A., Mr. Hanson said.