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How to Change the Battery in a Mazda Key Fob

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How to Change the Battery in a Mazda Key Fob 

If you've noticed your Mazda key fob taking multiple presses to respond, the battery is likely running low. Knowing how to change the battery in a Mazda key fob is a simple, quick DIY skill that will get you back to using your advanced keyless entry system without a trip to the service center. 

This guide walks you through the exact process so you can swap out the battery yourself. 

What You'll Need Before You Start 

Before you open up your Mazda key fob, you'll need to gather a few simple tools: 

  • A replacement battery: Most Mazda key fobs use a CR2025 coin-style battery, though some models may use a CR2032. (Check your owner's manual to confirm). 
  • A small flathead screwdriver: Essential for prying the housing apart. 
  • A small piece of tape: Wrap this around the metal tip of your flathead screwdriver to prevent scratching or gouging the key fob's casing. 
  • A clean, flat workspace: Having a clear table prevents tiny internal pieces from rolling away. 

How to Open Your Mazda Key Fob 

  1. Remove the auxiliary key: Turn the key fob over to find the small slide release button on the back. Push it and pull the metal emergency key out of the fob. 
  1. Locate the prying slots: Look inside the slot where the metal key was just stored. You will see a small notch on either side of the inner casing. 
  1. Pry the case open: Insert your tape-wrapped flathead screwdriver into one of these notches. Gently twist the screwdriver to begin splitting the two halves of the key fob apart. Repeat this on the other side if needed, working slowly until the cover pops open. 

Replacing the Battery  

With the case open, locate the battery compartment. Note the orientation of the existing battery before removing it; this is crucial as it ensures you'll place the new battery in the correct direction. Using your fingertips or a small tool, gently lift the old battery out, taking care not to touch any electronic circuitry inside the fob. Place the new battery into the compartment with the positive (+) side facing upwards, ensuring it sits securely within the designated holder. 

Then, align the two halves of the main key fob case and press them firmly together until you hear them click shut. Finally, slide your metal auxiliary key back into its slot. 

Pro Tip: Avoid using metal tweezers to pry out the old battery or slide the new one in. Metal tools can touch the internal circuitry and cause a short circuit, potentially damaging the transmitter. Your fingers or a small plastic tool is much safer. 

Testing Your Key Fob After the Swap 

With everything clicked back into place, stand near your Mazda and press the lock or unlock button. Your vehicle should respond instantly. If your model features a push-button start, jump inside and start the engine; the low-key battery warning indicator on your dashboard should now be gone. 

If the fob still isn't responding, open it back up to ensure the battery wasn't put in upside down. 

When to Visit a Professional 

While replacing a Mazda key fob battery is typically a five-minute job, sometimes key fob issues run deeper than a dead battery. If a fresh battery doesn't restore your key's remote functions, the transmitter may need to be reprogrammed or replaced altogether. 

If you need a replacement battery, a brand-new fob, or any other certified Mazda maintenance, the team at Brown & Wood Automotive is here to help. Stop by our Greenville dealership or visit us online at brown-wood.net to schedule a service appointment today! 

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