Disconnect the 10P connector from the key cylinder switch.
Check for continuity between the terminals.
There should be continuity between the No. 8 [No. 7] and No. 5 [No. 10] terminals when the door key cylinder switch is in UNLOCK position.
There should be no continuity between the No. 8 [No. 7] and No. 5 [No. 10] terminals when the door key cylinder switch is in the neutral or LOCK position.
There should be continuity between the No. 9 [No. 6] and No. 5 [No. 10] terminals when the door key cylinder switch is in LOCK position.
There should be no continuity between the No. 9 [No. 6] and No. 5 [No. 10] terminals when the door key cylinder switch is in the neutral or UNLOCK position.