Power Door Lock Switch: Description and Operation

Door Unlock Detection Switch Circuit
The door unlock detection switch is built into the door lock motor assembly. The switch is OFF when the door lock knob is in Lock Position, and is ON When the Knob is in Unlock position.
Furthermore, the door unlock detection switch circuit has terminal +B connected inside the theft deterrent ECU, when the door unlock detection switch is OFF, battery positive voltage is applied to the terminal of the door unlock detection switch circuit of the wireless door lock ECU.

Door Key Lock and Unlock Switch Circuit (Unlock Side)
The switch that is operated by key built into the door key cylinder. When the key is turned to the lock side, the lock terminal of the switch is grounded, and when the key is turned to the unlock side the unlock terminal is grounded.
Furthermore, the door key lock and unlock switch circuit has terminal +B connected inside the theft deterrent ECU, when either the lock or unlock terminal of the key lock and unlock switch are grounded, battery positive voltage is applied to the door key lock and unlock switch circuit of the wireless door lock ECU.

Door Key Lock and Unlock Switch Circuit (Lock Side)
Transistor inside the wireless door lock ECU coming ON causes the theft deterrent ECU to output a signal to lock all the doors.