Keyless Control Module Removal/Installation: 5HB

Disconnect the negative battery cable.
Disconnect the keyless control module connector (under driver's side dash).
Remove the bolt to remove the keyless control module and the bracket as a module.

Fig 1: Removing/Installing Keyless Entry Control Module (5HB)
Courtesy of MAZDA MOTORS CORP.
Remove the screw.
Push the stopper using a small driver, and remove the bracket.

Fig 2: Removing/Installing Keyless Entry Control Module Bracket (5HB)
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.