WARNING: This page is about a different car, the 2004 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Schematic - Key Interlock Does Not Lock Or Release
Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Key Interlock Does Not Lock Or Release Inspection Chart (1 Of 2)
Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Key Interlock Does Not Lock Or Release Inspection Chart (2 Of 2)