All have a 4-speed automatic transmission, traction control, antilock 4-wheel disc brakes, front head-and-torso side airbags, load-leveling suspension, and General Motors' OnStar assistance system. The Deville continues to impress with its impeccable road manners and luxurious comfort., , Front seat passengers are coddled in sumptuous leather seats with 10-way power adjustment and four-position headrests. Cadillac prides itself on being at the forefront of automotive technology, and the DeVille is no exception.