Height Control Switch
WARNING: This page is about a different car, the 2003 Lexus LS 430, 2002 Lexus LS 430, and 2001 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
The height control switch goes on when pressed to "HIGH" side and goes off when pressed to "NORM" side. The ECU detects height control switch condition and raises or lowers vehicle accordingly.