Ignition Key-In Switch

Remove the dashboard lower cover and knee bolster.
Disconnect the 8-P connector from the main wire harness. See Fig 1 .
There should be continuity between the No. 2 and No. 7 terminals when the ignition key is inserted into the ignition key cylinder. There should be no continuity with the ignition key removed.

Fig 1: Locating & Identifying 8-P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.