Disconnect the 10P connector (A) from the actuator (B).
Check for continuity between the terminals.
There should be continuity between the No. 8 [No. 7] and No. 10 [No. 5] terminals when the door lock knob switch in the UNLOCK position and no continuity when the switch is in the LOCK position.
[ ]: RHD model
If the continuity is not specified, replace the door lock actuator.