Power Mirror and Mirror Defogger Switch Test/Replacement

Remove the driver's door switch trim (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
Disconnect the 10P connector from the power mirror switch.

Fig 1: Disconnecting 10P Connector From Power Mirror Switch
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the three screws and the power mirror switch.
Check for continuity between the terminals in each switch position according to Fig 2 and Fig 3 .

Fig 2: Checking Continuity Between Terminals In Each Switch Position (Mirror Switch)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Checking Continuity Between Terminals In Each Switch Position (Defogger Switch)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the continuity is not as specified, replace the switch.