Designed through early 1996, in September 1997 a revised LS 400 was introduced for the 1998 model year. Changes were a five-speed automatic transmission, increased engine output to , with variable valve timing (VVT-i), and an added of torque. Acceleration times and fuel economy were improved as a result. The suspension and steering also received minor tweaks to improve feel and handling. Stylistically, the vehicle sported a new front fascia, side mirrors, and updated wheels; a rear window diversity antenna replaced the conventional power mast. The cabin received upgrades, including a trip computer, HomeLink, retractable rear headrests, reading lamps, and ultraviolet-tinted glass, while the climate control gained a micron filtration feature with a smog sensor. In August 1997, the first production laser adaptive cruise control on a Toyota vehicle was introduced on the Celsior version (Japan only) It controlled speed only through throttle control and downshifting, but did not apply the brakes. Because of laser technology limitations, it deactivated in bad weather. A CD-ROM-based GPS automotive navigation system became an option in the U.S. Added safety features included front side airbags, vehicle stability control and in 2000, brake assist. Introduced low beam HID headlamps. The headlights were also equipped with a programmable delay feature for proximity illumination. In February 2000, the limited "Platinum Series" LS 400 was introduced at the Chicago Auto Show in partnership with American Express. The edition featured most luxury options as standard, along with separate exterior colors, wheels, badging, and two years' no-fee use of an American Express Platinum Card. The third-generation Lexus LS 430 (UCF30) debuted at the North American International Auto Show in January 2000 as a 2001 model, introducing a new body design with a host of new interior and technological features. The interior design was inspired by the guest room of the luxury hotel (Imperial Hotel, Four Seasons Hotel, The Ritz-Carlton) and the seat was inspired by the first class seat of British Airways and Japan Airlines. It was the first US market Lexus with adaptive cruise control (called Dynamic Laser Cruise Control). It employed a lidar sensor and (unlike the laser ACC introduced in 1997 on the Celsior) was able to activate brakes for deceleration. However, because of laser technology limitations, it would deactivate in bad weather. The sedan was equipped with a new 4.3-liter "3UZ-FE" engine generating and of torque.