Updated: 11:26 a.,. ET to add GM switch probe and 8:05 p.m. to add Toyota response.  The government has expanded a probe of power window switches that can start fires to include 1.4 million 2007-2009 Toyota models, the Associated Press reports, and upgraded it to an engineering analysis that could lead to a recall.  A preliminary probe was opened in February initially involving more than 800,000 2007 Camrys and RAV4s. Now, according to documents on the National Highway Traffic Safety Administration website, the engineering analysis covers:  The vehicles were built from September of 2006 through August of 2008, NHTSA said, and all use the same power window switch in the driver's door. The switches can overheat and cause fires, NHTSA said, and it and Toyota have 161 complaints of fires and reports of nine injuries.  A Toyota spokesman, Brian Lyons, that Toyota is cooperating with NHTSA in the investigation.  NHTSA also said over the weekend that it is upgrading a similar power window switch probe of 342,000 2006-2007 Chevrolet TrailBlazer to a full engineering analysis.  NHTSA and GM have received 242 complaints, including 28 fires, but no injuries. Some happened while the truck was moving, others while it was off and unattended. The Trailblazer was discontinued after 2009 model.  GM has said any TrailBlazer owner who smells smoke or whose power windows stop working should contact the dealer.  The government said that it also will evaluate other GM vehicles with the same underpinnings -- including Buick Rainier, GMC Envoy and Saab 9-7X -- but GM has said in the past they have different door configurations.
NHTSA adds 600,000 more Camrys and other models, upgrades investigation of power window fire risk to higher level.