Circuit Description
WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
The key unlock warning switch goes on when the ignition key is inserted in the key cylinder and goes off when the ignition key is removed. The ECU operates the key confinement prevention function while the key unlock warning switch is on. See Fig 1.