Without Sensor Cover

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Slide the cover in the direction of the arrow shown in the figure.

Fig 1: Sliding Cover In Direction
Courtesy of MAZDA MOTORS CORP.
Detach tabs while push the cover in the direction of the arrow (1) shown in the figure, then remove the cover in the direction of the arrow (2).

Fig 2: Pushing Cover In Direction
Courtesy of MAZDA MOTORS CORP.
Disconnect the auto-dimming rearview mirror connector.

Fig 3: Disconnecting Auto-Dimming Rearview Mirror Connector
Courtesy of MAZDA MOTORS CORP.
Loosen the screw.

Fig 4: Loosening Screw With Torque Specifications
Courtesy of MAZDA MOTORS CORP.
Remove the auto-dimming rearview mirror in the direction of the arrow shown in the figure.

Fig 5: Removing Auto-Dimming Rearview Mirror
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.