WARNING: This page is about a different car, the 2005 Honda Civic, 2004 Honda Civic, 2003 Honda Civic, and 2002 Honda Civic. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Multiplex Control System Wiring Diagrams (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Multiplex Control System Wiring Diagrams (2 Of 2)