Sedan Model

WARNING: This page is about a different car, the 2012 Subaru Outback and 2012 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the ground cable from battery.
Remove the trunk lid trim. Refer to TRUNK ROOM TRIM .
Remove the rear finisher light assembly.
1. Disconnect the connector.
2. Remove the nuts and bolts and remove the rear finisher light assembly.
  
  Fig 1: Locating Rear Finisher Light Assembly Nuts And Bolts
  Courtesy of SUBARU OF AMERICA, INC.