Advanced Key Disassembly/Assembly

WARNING: This page is about a different car, the 2010 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Pull out the auxiliary key.

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

Fig 2: Inserting Tape-Wrapped Flathead Screwdriver Into Notch
Courtesy of MAZDA MOTORS CORP.
Remove the battery.

Fig 3: Removing Battery
Courtesy of MAZDA MOTORS CORP.
NOTE:
- If the O-ring has come off, put it back in place before installing the battery.
  
  Fig 4: Identifying O-Ring
  Courtesy of MAZDA MOTORS CORP.
Install the new battery (CR1620) with the negative pole facing down.

Fig 5: Installing Battery (CR1620) With Negative Pole Facing Down
Courtesy of MAZDA MOTORS CORP.
Align the upper and lower covers and close the transmitter.

Fig 6: Aligning Upper And Lower Covers And Close Transmitter
Courtesy of MAZDA MOTORS CORP.
Insert the auxiliary key.

Fig 7: Inserting Auxiliary Key
Courtesy of MAZDA MOTORS CORP.