The Lexus RX is first created in 1997 as a concept Lexus, followed several months later by the debut of the production RX 300. In 2003, the second generation RX debuted in the United States, and the new RX 330 is on sale shortly afterwards. In 2004, the RX line added the first luxury hybrid type, the RX 400h and the RX 330 has been upgraded to the RX 350 for model year 2007. equivalent versions of the models of first and second generation were sold in Japan under the Toyota Harrier until 2008. The new version of the third generation RX 450h 350/RX models created in late 2008.
The second generation Lexus RX inside Harrier was powered by a 3.3-liter V6 ULEV certified 3MZ-FE, producing 230 hp (172 kW) and SAE (238 lbf ft) mated to a 5-speed automatic transmission and was available either before or AWD. height adjustable air suspension was again an option on four-wheel drive models. The new interior RX as real Golden Bird's Eye Maple or walnut wood, a sliding center storage multi-level console, the control dual-zone climate, tilt wheel, eight airbags, including a knee airbag driver . Available options include a 210-watt 11-speaker Mark Levinson Premium Sound System, DVD navigation system with rearview camera, rear seat DVD player with wireless headphones, three panel panoramic sunroof, a new Adaptive Front-lighting System (AFS) with swiveling headlights, Dynamic Laser Cruise Control system, power tilt / telescoping steering wheel and windscreen wipers with rain sensor.
2005 RX330 Lexus thundercloud edition 2005, Lexus introduced the RX 330 "Edition thundercloud" in the U.S. market, where the grille horizontal chrome slats, alloy wheels unique, dark gray and Bird's Eye maple wood trim, two exterior colors, and select other options as standard.  Although the power to the back door was voluntary, at first, was champion in 2005. In 2006, changes in the SAE rating has dropped to an output of 223 hp and the engine is ULEV-II emissions was reached. Sales of second-generation Lexus RX Series Lexus RX continued success. In 2006, the RX series sold over 108,000 units, a luxury car that Lexus RX-seller in the United States.