Keyless Receiver Removal/Installation

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the following parts:
(1)Trunk board (See TRUNK BOARD REMOVAL/INSTALLATION .) (2)Bass-box (with Bose®) (See BASS-BOX REMOVAL/INSTALLATION .) (3)Sub-trunk (See SUB-TRUNK REMOVAL/INSTALLATION .) (4)Trunk end trim (See TRUNK END TRIM REMOVAL/INSTALLATION .)
Pull back the trunk side trim (RH) to a position which allows for the removal of the keyless receiver. (See TRUNK SIDE TRIM REMOVAL/INSTALLATION .)
Disconnect the connector.

Fig 1: Locating Keyless Receiver Connector
Courtesy of MAZDA MOTORS CORP.
Remove the bolts.
Remove the keyless receiver.
Install in the reverse order of removal.