WARNING: This page is about a different car, the 2019 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.
Inspect the following items regarding the vehicle's state.
Courtesy of SUBARU OF AMERICA, INC.
CONDITION OF IGNITION POWER SUPPLY
Courtesy of SUBARU OF AMERICA, INC.
Symptoms
NOTE:
The items vary depending on destinations and equipment.