Key Lock-in Prevention Function does not Work Properly: Description
WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
The transponder key ECU uses the unlock warning switch to detect when the key is in the ignition key cylinder, and transmits the detection as a signal to the theft warning ECU. When the door is locked with the ignition switch OFF and the key in the ignition key cylinder, the theft warning ECU transmits the LOCK signal. Then the UNLOCK signal is sent to the multiplex network door ECU front LH and RH. After those operations, the multiplex network front door ECU LH and RH drive the door lock motor.