Ignition Key Switch

Remove the steering column lower cover, then disconnect the 6-pin connector from the dash joint box. See Fig 1.
There should be continuity between the BLU/WHT and BLK terminals when the ignition key is inserted into the ignition key cylinder. There should be no continuity when the ignition key is removed.

Fig 1: Identifying Key Switch & 6-Pin Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.