Advanced Key Battery Replacement [Advanced Keyless Entry And Push Button Start System]

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Pull out the auxiliary key.

Fig 1: Pulling Out Auxiliary Key
Courtesy of MAZDA MOTORS CORP.
Insert a flathead screwdriver into the notch in the transmitter and rotate it in the direction shown in the figure to open the transmitter.

Fig 2: Opening Transmitter
Courtesy of MAZDA MOTORS CORP.
Remove the battery.

Fig 3: Locating Battery
Courtesy of MAZDA MOTORS CORP.
Install the new battery (CR2025) with the positive pole facing down.

Fig 4: Locating Battery

Courtesy of MAZDA MOTORS CORP.

Align the upper and lower covers and close the transmitter.
Insert the auxiliary key.

Fig 5: Inserting Auxiliary Key

Courtesy of MAZDA MOTORS CORP.