Mazda 3 key battery
BM/BN
2013–2019- Smart keyCR2025
How to change a smart key battery
- Slide the release catch and pull out the emergency key blade.
- Wrap the tip of a small flat screwdriver in tape or a cloth, put it in the slot the blade leaves and twist gently to part the case. Keep it off the circuit board and contacts.
- Note which way up the old cell sits before you lift it out. It varies by key, so don't assume + is up.
- Fit a new CR2025 the same way up, holding it by the edges. Leave any grease on the contacts.
- Clip the case back together and test the buttons at the car. Most keys work straight away with no reprogramming.
- Keep new and old cells away from children. A swallowed button battery can cause serious injury within two hours.
North American models
BP
2019–2024- Smart keyCR2032
BM
2014–2018- Smart keyCR2032
For locksmiths · BM/BN
- KeysSmart key
- Tools confirmed9
- Transponder chipSubscribers
- Programming procedureSubscribers
Questions
Mazda 3 key battery questions
BM/BN (2013–2019): CR2025 in the smart key.