Washer Function
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.
When the ignition is on and the rear wiper and washer switch is turned to WASH1 position, only the washer motor operates, and with the switch at WASH2 position, the wiper motor also operates following the washer motor operation. See WIRING DIAGRAMS .