TPMS Module

WARNING: This page is about a different car, the 2014 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the ground cable from battery.
Remove the mat - rear floor CTR (a) and the mats - rear floor (b) of right and left sides.

Fig 1: Identifying Rear Floor Mat
Courtesy of SUBARU OF AMERICA, INC.
Remove the clips and remove the cover - trunk (a) and right and left spacers - rear front side (b).

Fig 2: Identifying Cover - Trunk Components
Courtesy of SUBARU OF AMERICA, INC.
Remove the TPMS module assembly.
1. Disconnect the connector.
2. Remove the bolts, then remove the TPMS module assembly.
  
  Fig 3: Locating TPMS Module
  Courtesy of SUBARU OF AMERICA, INC.