WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Audio System Component Location (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Identifying Audio System Component Location (2 Of 2)