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WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Remove the roof console (see ROOF CONSOLE INPUT TEST/REPLACEMENT ).
Remove the screws and bracket (A).

Fig 1: Identifying Bracket, Connector And HFL Microphone
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the connector (B) and remove the HFL microphone (C).
Install the HFL microphone in the reverse order of removal.