WARNING: This page is about a different car, the 2003 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
AUTO A/C MODEL
Fig 1: Identifying Control Unit Components (Auto A/C Model)
Courtesy of SUBARU OF AMERICA, INC.
MANUAL A/C MODEL
Fig 2: Identifying Control Unit Components (Manual A/C Model)