Power Mirror and Mirror Defogger Switch Test/Replacement

Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
Disconnect the 13P connector (A) from the power mirror switch (B).

Fig 1: Identifying 13P Connector From Power Mirror Switch
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between the terminals in each switch position according to the table.
Mirror Switch:

Fig 2: Terminals Continuity Reference Chart - Mirror Switch
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Defogger Switch:

Fig 3: Terminals Continuity Reference Chart - Defogger Switch
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the continuity is not as specified, remove the screws and replace the power mirror switch.