WARNING: This page is about a different car, the 2015 Subaru XV Crosstrek and 2015 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Except for model without keyless access.
Gasoline engine model
Fig 1: Identifying Keyless Access With Push Button Start System Components
Courtesy of SUBARU OF AMERICA, INC.
HEV model
Fig 2: Identifying Keyless Access With Push Button Start System Components