Card Key Battery Replacement[Advanced Keyless System]

Pull out the auxiliary key.

Fig 1: Pulling Out Auxiliary Key
Courtesy of MAZDA MOTORS CORP.
Replace the cap using a flathead screwdriver, then rotate and remove the cap.
CAUTION: Do not turn the cap excessively. The cap may be damaged.

Fig 2: Identifying Cap
Courtesy of MAZDA MOTORS CORP.
Insert a flathead screwdriver into the crack and press the battery out.

Fig 3: Inserting Flathead Screwdriver Into Crack
Courtesy of MAZDA MOTORS CORP.
Insert the new battery (CR2025) with the positive pole (+) facing the (+) mark on the cap.
Battery specification

Lithium CR2025 x 1
NOTE:
- The batteries will last about 1 years when used 10 times a day .
  
  Fig 4: Identifying Mark On Cap
  Courtesy of MAZDA MOTORS CORP.
Rotate and close the cap.
Reinsert the auxiliary key.

Fig 5: Identifying Auxiliary Key Holder Cap
Courtesy of MAZDA MOTORS CORP.