TPMS Control Module

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 And Rear Floor CTR Mats (TPMS Control Module)
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 Trunk Cover Clips And Spacers
Courtesy of SUBARU OF AMERICA, INC.
Remove the TPMS CONTROL MODULE.
1. Disconnect the connector.
2. Remove the bolts to remove the TPMS CONTROL MODULE.

Fig 3: Locating TPMS Control Module Bolt And Connector

Courtesy of SUBARU OF AMERICA, INC.