1999 Lexus LS 400 Owners Manual - Page 319

STARTING AND DRIVING "NORMAL" mode - For driving on roads with a normal surface. "HIGH" mode - For driving on rough roads which are unsurfaced or continually bumpy. The damping effect is set slightly firmer in "HIGH" mode. So you may feel the vibration of the vehicle compared to in "NORMAL" mode. However, this does not mean a malfunction in the system. We recommend you use a "NORMAL" mode in normal driving. To change the mode, push the selector switch. "NORMAL" mode The vehicle height remains at normal height at all driving speeds. "HIGH" mode The vehicle height switches between the following two vehicle heights according to the driving conditions: Vehicle height Normal High Driving condition Medium and high speed driving Low speed driving 303