Check Key Switch Circuit
WARNING: This page is about a different car, the 2016 Subaru Outback and 2016 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
When the body integrated unit (except for C0 and C5 models) or the immobilizer control module (C0 and C5 models) is replaced, registration of the immobilizer system is required. For details, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.