How to Replace the Battery in Your Mazda Key Fob Battery Replacement
A key fob is an electronic device that remotely locks/unlocks and starts your Mazda vehicle. The small battery inside typically needs to be replaced every 1-2 years when it loses charge. Symptoms like reduced range mean it’s time for a new CR2032 coin cell battery. This straightforward DIY battery swap only takes 10-15 minutes.
Symptoms Your Mazda Key Fob Battery Needs Replacement
- Reduced range/key fob not working from a typical 20-foot distance
- Buttons become intermittent and sometimes don’t activate
- The dashboard warning light indicates low keyless entry key fob battery
Once you notice these issues, it means the CR2032 battery is running low and should be promptly swapped out. As the voltage drops, so does the key fob’s transmitting capability. Replacing the battery early on can prevent full failure down the road.
What You’ll Need to Replace the Battery
- New CR2032 3V lithium coin cell battery (exact type per your manual)
- Small Phillips head screwdriver
- Clean towel or lint-free cloth
Purchase an authentic CR2032 replacement battery made for key fob use. Avoid cheaper generic brands not designed for constant transmitting. An official Mazda part will run $5-10 on average. Also, have your screwdriver and cloth ready before starting.
Safely Removing the Old Mazda Key Fob Battery
Carefully pry open the plastic key fob casing using your fingers or a small flathead screwdriver. There may be small screws or tabs securing the case. Once inside, identify the battery, noting the + positive side facing up in most Mazda remotes.
To remove, follow these steps:
- Use the screwdriver to gently pry the battery free from its securing clip.
- Remove the old CR2032 battery, making sure not to bend or touch the electrical board contacts.
- Use your cloth to clean away any grease or dirt buildup on the plastic surrounding contacts.
| Don’t | Do |
|---|---|
| Pull forcefully on the battery | Gently rock the battery loose |
| Touch circuit board contacts | Clean surrounding contacts |
| Force an incorrectly size battery | Double check CR2032 |
Installing the New CR2032 Battery
After cleaning the key fob battery compartment interior, get ready to insert the fresh CR2032 battery. The positive + side must face upward in most Mazda keyless entry remotes. If unsure, check your car manual or the inside of the key casing.
Hold the battery only by the outer edges and gently set it into position, aligned with the electrical clips. You may need to press an edge downward to snap it underneath the securing bracket. Do not touch the center’s metallic electrical contacts.
Syncing/Pairing Key Fob with Vehicle
Once the new battery is correctly installed and secured, most Mazdas will automatically synchronize without additional steps. But certain models require manual pairing or resetting:
- Stand next to the vehicle door and press any button (unlock/trunk/panic), holding down for 3+ seconds. The door should lock/unlock.
- Rapidly press and release lock/unlock 4-5 times steadily. Hazard lights will flash when synced.
- Hold down 2 outer buttons until hazards flash; programming is complete.
Consult your exact Mazda owner’s manual if unsure of the proper key fob synchronization process after a battery change. Call the dealership if still not working.
Disposing of Old Batteries Properly
Old lithium coin cell batteries still contain harmful chemicals and metals. Follow local regulations to find a battery recycling center rather than tossing in normal waste. Many stores have collection bins onsite.