Ignition Key Switch

Remove the steering column lower cover, then disconnect the 13-P connector from the main wire harness. See Fig 1 .
There should be continuity between the BLU/WHT and BLK terminals when the ignition switch is turned from "II" to "O" position. There should be no continuity when the ignition key is removed.

Fig 1: Locating & Identifying 13-P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.