WARNING: This page is about a different car, the 2008 Acura TSX, 2007 Acura TSX, and 2006 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Navigation System - Circuit Diagram (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Navigation System - Circuit Diagram (2 Of 2)