Wiper/Washer Switch
WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
The wiper/washer switch is part of the combination switch. See COMBINATION SWITCH under REMOVAL & INSTALLATION under STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT.