Rear Seat Warmer Control Unit Removal/Installation

WARNING: This page is about a different car, the 2018 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Fold the rear seat back.
Partially peel back the trunk covering.
Disconnect the connectors.

Fig 1: Rear Seat Warmer Control Unit, Connectors, Guide And Bolts With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Remove the bolt.
While detaching the guide from the body, remove the rear seat warmer control unit.
Install in the reverse order of removal.