With Forward Sensing Camera (FSC)

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the sensor cover. (See SENSOR COVER REMOVAL/INSTALLATION .)
Disconnect the auto-dimming mirror connector.

Fig 1: Disconnecting Auto-Dimming Mirror Connector
Courtesy of MAZDA MOTORS CORP.
Remove the screw.

Fig 2: Removing Screw
Courtesy of MAZDA MOTORS CORP.
Remove the auto-dimming mirror in the direction of the arrow shown in the figure.

Fig 3: Removing Auto-Dimming Mirror
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.