General Motors is recalling another 230,000 midsize SUVs due to a risk of fire substantial enough that the company is advising owners to park the vehicles outside--as in not in a garage--until repairs can be made.

The recall follows an earlier action by GM last August that covered about 250,000 vehicles, including the Chevrolet Trailblazer and GMC Envoy. Similar recalls around the same problem have impacted several other manufacturers, including Toyota, and have so far involved more than 1 million vehicles sold in North America alone.

The focus of the investigation and incidents is a master power door and window module located in the driver's door. Moisture has been found to leak into the door and corrode electrical connections. The module can then short circuit and overheat, which in turn has led to some fires. There may have been as many as 58 fires associated with the problem.

GM's original recall involved 249,260 midsize sport-utility vehicles sold in 20 states and the District of Columbia. The new recall covers an additional 193,000 of the SUVs sold in the U.S. and another 38,000 sold in Canada, Mexico and other parts of the world.

Toyota last year ordered a recall of 7.5 million vehicles worldwide over a similar problem, with 2.5 million of the vehicles sold in the U.S.

Vehicles covered by the recall include: The 2006 Chevrolet Trailblazer EXT and GMC Envoy XL; The 2006 and 2007 Chevrolet Trailblazer, GMC Envoy and Buick Rainier; Also involved are the 2006 and 2007 Saab 9-7X and Isuzu Ascender.

GM says it will notify owners, and either apply a moisture protection coating on the switch module or replace the component with the moisture protection added. Repairs will be made at no cost to owners even if the vehicle is out of warranty.