How to Change the Battery in Your Mazda Key Fob

Were you about to start a trip and your key fob decided not to work? It happens to the best of us. If you suddenly find yourself needing to change battery in Mazda key fob, this guide will help you with easy, step-by-step instructions.

Whether you’re new to the process or not, we ensure that even first-timers can navigate how to change a Mazda key fob battery. Simply follow along with our article and you will be sure to have your key fob back in action and ready for your next excursion. Let’s start the process.

What You Need for Mazda Key Battery Replacement

When it comes to changing a Mazda key fob battery, you will need a few crucial things to begin with your task:

1. Replacement Battery: A majority of Mazda key fobs use a CR2025 or CR2032 3V lithium battery.
2. Flathead Screwdriver or Thin Tool: A small flathead screwdriver or a tool like a thin blade can help open the key fob.
3. Clean Cloth or Compressed Air Can (Optional): The cloth will help wipe down and remove any fingerprints or debris on the battery and contacts, while the compressed air gently cleans out the contents of the battery compartment.

Identifying the Correct Battery Type (CR 2025)

When choosing the replacement to use when you change battery in Mazda key, you must detect the correct battery replacement. Typically, it is a CR2025 lithium coin battery – a compact, long-lasting battery. However, if you are unsure of the specific type, simply check your vehicle’s manual or the existing battery’s etched markings to confirm it will be compatible before you buy a replacement.

How to Change the Battery on a Mazda Key: Step-by-Step

After selecting your battery and gathering your tools, you are ready to change Mazda key battery. Follow the nine steps below and refer to the diagram for a visual guide.

STEP 1: Locate the Button on the Back of the Key.

On the back of your Mazda key fob, you should see a discreet little button.

STEP 2: Press the Button to Eject the Emergency Key.

Using a fine tool or your fingernail, gently press the little button. This action will help you release the emergency key. Remove the key.

STEP 3: Take a Small Flathead Screwdriver and Insert in the Gap of the Emergency Key Socket.

Now that the key is removed, you will see a gap. Use your available tool as leverage to pry open the cover, working on the side seams, both inside or outside the cover.

STEP 4: Twist to Open the Cover.

Once the external cover is removed, you will see the inner compartment of the key fob.

Step 5: Remove the Battery Cover Exposing the Battery.

Inside the compartment, there will be a cover directly on the battery. Remove this cover and then you will see the coin battery.

STEP 6: The Battery is Removed and Replaced Making Sure the Battery is Placed According to the Terminals.

Remove the battery by using your tool to lift it out of its place. You can choose to do a light cleaning using a cloth or compressed air can on the compartment. Then, remove any protective tape from the new coin battery and then fit the replacement battery in, with the correct terminals in the right places.

STEP 7: Put Back the Battery Cover.

You can now put the battery cover onto the new battery.

STEP 8: Press Back the Key Cover.

Click the Mazda key fob cover back securely into place.

STEP 9: Insert Back the Emergency Key.

To complete the task, return the emergency key to the slot on your Mazda key fob.

The Key is Ready for Use.

Once you have returned all components to the correct places, you now have successfully change battery on Mazda key, and your key fob should be ready for use.

Common Issues and Troubleshooting

Typically, after changing the battery in a Mazda key, it should start working right away. Yet, there may be the odd issue that could bar it from functioning properly. Some of the problems you could encounter include a simply misaligned battery, some debris stuck on the terminals, or internal wear and tear of the fob compartment. Explore our tips below to help restore your Mazda key fob’s functionality with ease.

Testing the Key’s Functionality After Battery Replacement

To determine if your key fob is working again after a change battery in Mazda key, we suggest running a test. This will rule out if it was indeed a depleted battery or another issue at play. Start by going through its functions – press each button for lock and unlock, panic, and if you have it, the remote start feature. If you have no response, check the battery is facing the correct way and whether the fob unit is clicked into place.

Solutions for Potential Key Problems

If you tried the above scenarios but still had no response, then it may come down to a programming or fob component error. If the problem persists, try reprogramming the key fob with the steps below or consult a professional to check for possible mechanical or electrical issues. To give yourself peace of mind if your key fob ever troubles you, you can opt to install Ghost Immobilisers so you can deter any kind of car hacking, key-cloning, or unwanted access to your Mazda.

Maintaining Longevity and Optimal Performance

To help your Mazda key fob extend its longevity, check the battery often and replace it when the signal weakens (noticeable with a dimmed LED light). If you are about to change battery on Mazda 3 key fob, you would have noticed your car giving you prior warning – this is a helpful feature.

Regular Battery Replacement Intervals

You can expect your Mazda key fob battery to last about 1 to 2 years, depending on its usage – although they can last 3-4 years. Keep a lookout for any signs of reduced signal range or delayed response time, which will indicate it’s time for a new battery. By proactively replacing the battery, you will prevent unexpected key fob failures, keeping your car access smooth and hassle-free for consistent performance.

Additional Tips for Key Care and Maintenance

To extend the lifespan of your Mazda key fob, there are a few regular things you can do to help to prolong it’s lifespan:

• Avoid Harsh Environments: Keep the key fob away and out of extreme temperatures and moisture.
• Handle With Care: Avoid unnecessary pressure against the buttons or dropping the key fob.
• Replace Batteries Promptly: As soon as there is a reduced range or delayed response, change the battery.
• Clean Regularly: Wipe off dirt, dust, or debris by using a soft, dry cloth.
• Keep Away From Electronics: Store your Mazda key fob away from devices that may cause signal interference.

Tip: Consider buffering it against damage by storing it in a protective case to safeguard it from scratches and wear, and for added assurance, have a spare car keys set available.

FAQs

Why is my Mazda key fob not working after replacing battery?

If your Mazda key fob isn’t working you replaced the coin battery – it could be a case of the battery not sitting correctly. Try removing and reinserting it, and check that the terminals align properly. If the key fob still doesn’t work, it may need to be reprogrammed or an internal malfunction that requires professional assistance.

How to reset Mazda key fob?

To reset your Mazda key fob, sit in the driver’s seat with all the doors closed. Insert your key into the ignition, turn the key to the “ON” position (without starting the engine), then back to “OFF”– repeat this 2–3 times quickly. Open and close the driver’s side door 3 times within 5 seconds and press any button on the key fob you want to program.

Can I drive my Mazda with dead key fob?

Yes, you can. Even with a dead Mazda key fob, you can use your emergency key to unlock and get into your Mazda. Then, to start the engine, align the key fob on the start button until it turns green, you can then start the car by pressing the brake pedal and then press the start button again.