All Doors LOCK/UNLOCK Functions do not Operate Via Master Switch, Driver Side Door Key Cylinder: Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
The main body ECU RH (cowl side junction block RH) receives switch signals from the multiplex network master switch, and driver side door key cylinder switch signals from the front door lock (driver side) The main body ECU RH (cowl side junction block RH) activates the door lock motor on each door according to these signals