Check Each Connection
WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
If there are no problems in the inspections of 1 and 2 above, use "< Ref. to NAVIGATION in SYSTEM WIRING DIAGRAM . >" of the navigation device to perform inspection.