WARNING: This page is about a different car, the 2001 Subaru Outback, 2001 Subaru Legacy, 2001 Subaru Impreza, and 2001 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power Seats Wiring Diagram (Legacy & Outback)
Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Heated Seat System Wiring Diagram (Forester)
Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Heated Seat System Wiring Diagram (Legacy & Outback)