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.
Fig 1: Handsfreelink System (Without Navigation) - Circuit Diagram (5 Of 6)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Handsfreelink System (Without Navigation) - Circuit Diagram (6 Of 6)