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