Manual Lock Operation
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 door lock control switch of the driver or front passenger side is pressed to the LOCK side, through communication control of the door ECU, the current flows from TERMINAL A+ of the door ECU to the door lock motor to TERMINAL A- of the door ECU to GROUND, and locks the door. See WIRING DIAGRAMS .