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WARNING: This page is about a different car, the 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Eject all the CDs before removing the audio unit and CD changer to prevent damaging the CD player's loading mechanism.

Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).
Disconnect the connector from the USB adapter unit.
Remove the bolts and the USB adapter unit (A) from the bracket (B).

Fig 1: Bolts And USB Adapter Unit From Bracket With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the USB adapter unit in the reverse order of removal.