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Remove the dashboard center vent (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ).
Disconnect the 10P connector (A) from the audio-HVAC subdisplay unit (B).

Fig 1: Identifying 10P Connector And Audio-HVAC Subdisplay Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the two screw and audio-HVAC subdisplay unit.
Install the audio-HVAC subdisplay unit in the reverse order of removal.