Federal safety officials are investigating a Mercedes-Benz sport utility vehicle after getting three complaints that the driver's side seat warmers can overheat, the National Highway Traffic Safety Administration told the Associated Press (AP).

The investigation involves ML320 SUVs from the 2003 model year, NHTSA reportedly said - in one case, a driver allegedly sustained second-degree burns and the safety agency also said the seat covers also may burn.

AP said NHTSA also is investigating several Chrysler minivans after owners reported that the headlights may flicker and go off while the vehicles are moving.

The investigation involves Dodge Caravan and Grand Caravan, Plymouth Voyager and Chrysler Town and Country minivans from the 2001 and 2002 model years, the report said.

Chrysler spokesman Max Gates told the Associated Press that there are around 744,000 minivans from those model years on the road and added that the company is working with NHTSA investigators.

NHTSA investigations can lead to vehicle recalls, AP noted.