Sedan Model

Disconnect the ground cable from battery.
Remove the rear shelf trim. < Refer to REMOVAL , Rear Shelf Trim. >
Remove the TPMS & keyless control module.
1. Disconnect the connector.
2. Remove the bolt and then remove the TPMS & keyless control module.
  
  Fig 1: Removing TPMS & Keyless Entry Control Module (Sedan Model)
  Courtesy of SUBARU OF AMERICA, INC.