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.
Fig 1: Inspecting Door Lock Switch & Circuit Symptom Chart (1 Of 2)
Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Inspecting Door Lock Switch & Circuit Symptom Chart (2 Of 2)