WARNING: This page is about a different car, the 2008 Acura TSX, 2007 Acura TSX, 2006 Acura TSX, 2005 Acura TSX, and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.
'04-06 models
Fig 1: Immobilizer System Circuit Diagram ('04-06 Models)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
'07-08 models
Fig 2: Immobilizer System Circuit Diagram ('07-08 Models)