Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
The door key lock and unlock switch is built in the door lock motor. When the key is turned to the lock side, terminal 5 of the switch is grounded and when the key is turned to the unlock side, terminal 6 of the switch is grounded.
Door key lock and unlock switch can be checked using DTC check. Refer MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICS .