With DPMS: Notes

Remove the door panel (seeFRONT DOOR PANEL REMOVAL/INSTALLATION ).
Disconnect the 12P connector (A) from the power mirror actuator (B).

Fig 1: Disconnecting 12P Connector From Power Mirror Actuator
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check actuator operation by connecting power and ground according to Fig 2 .

Fig 2: Checking Actuator Operation By Connecting Power And Ground Chart
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the mirror fails to work properly, replace the mirror actuator.