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WARNING: This page is about a different car, the 2008 Acura TSX, 2007 Acura TSX, 2006 Acura TSX, 2005 Acura TSX, and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.

Remove the Audio-HVAC Display Module (see AUDIO-HVAC DISPLAY MODULE REMOVAL/INSTALLATION ).
Remove the two mounting screws.
Disconnect the 10P connector (A) from the subdisplay unit (B).

Fig 1: Identifying 10P Connector And Subdisplay Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the subdisplay unit in the reverse order of removal.