Is your 2020 Mazda CX-5 key fob acting up? Perhaps the buttons are unresponsive, or the indicator light isn’t flashing when you press them. These are common signs that your key fob battery is likely running low and needs replacing. Don’t worry, changing the battery in your Mazda CX-5 key fob is a straightforward task you can easily do yourself, saving you time and a trip to the dealership. This guide will walk you through the process step-by-step, ensuring you get back on the road quickly and without hassle.
Recognizing the signs of a dying key fob battery is the first step. For 2020 Mazda CX-5 models, keep an eye out for these indicators:
- Faint or No Indicator Light: When you press a button on your key fob, you should typically see an operation indicator light flash. If this light is weak or doesn’t appear at all, the battery is likely the culprit.
- Reduced Operating Range: You might notice that you need to be closer to your Mazda CX-5 than usual for the key fob to lock or unlock the doors. This decrease in range signals weakening battery power.
- Dashboard Warning Light: In some 2020 Mazda CX-5 models with a Type A instrument cluster, a KEY indicator light (green) will flash for about 30 seconds after switching off the engine. This is another visual cue indicating a low key fob battery.
Before you start, it’s important to identify which type of key fob you have, as the battery replacement procedure varies slightly between Type A and Type B. Refer to your owner’s manual if you are unsure, or simply compare your key fob to the images below to determine your type.
Identifying Your Mazda CX-5 Key Fob Type
While both types serve the same function, the internal mechanisms differ slightly. Knowing your key fob type will ensure you follow the correct battery replacement steps.
(Type A)
This type typically features an auxiliary key that slides out from the fob.
(Type B)
Type B fobs often have a removable lower cover section.
Once you’ve identified your key fob type, gather the necessary tools and a new battery.
What You’ll Need for a 2020 Mazda CX-5 Key Fob Battery Replacement
For both Type A and Type B key fobs, you’ll need:
- A new battery: For Type A, use a CR2025 battery or equivalent. For Type B, use a CR2032 battery or equivalent. These batteries are widely available at most drugstores, supermarkets, and online retailers.
- A small flathead screwdriver: Ideally, wrap the tip with tape to prevent scratches on your key fob casing.
- Cellophane or equivalent tape: For insulating the old battery terminals before disposal.
Now, let’s get to the step-by-step guides for each key fob type.
Step-by-Step Guide: Replacing the Battery in a Type A Key Fob
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Remove the Auxiliary Key: Press the small knob or button on your key fob and slide out the auxiliary key.
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Pry Open the Cover (Initial Opening): Take your tape-wrapped flathead screwdriver and gently twist it in the direction indicated by the arrow in the image. This will slightly open the cover.
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Slide and Separate the Cover: Insert the tape-wrapped flathead screwdriver into the gap you’ve created and slide it in the direction of the arrow to further separate the cover.
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Remove the Cover Completely: Twist the flathead screwdriver again in the direction of the arrow to fully detach and remove the key fob cover.
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Remove the Battery Cap and Old Battery: Carefully remove the small battery cap. Then, take out the old battery. Pay attention to the rubber ring around the battery compartment; ensure it’s not scratched or damaged. If it comes loose, reattach it before inserting the new battery.
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Insert the New Battery: Place the new CR2025 battery into the compartment with the positive (+) pole facing upwards. Cover the battery with the battery cap.
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Close the Key Fob Cover: Carefully snap the key fob cover back into place, ensuring it is securely closed.
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Reinsert the Auxiliary Key: Slide the auxiliary key back into the key fob until it clicks into its locked position.
Step-by-Step Guide: Replacing the Battery in a Type B Key Fob
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Remove the Lower Cover: Press the knob on the side of the key fob and remove the lower cover in the direction of the arrow.
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Unlock the Upper Cover: Press in the tab as shown in the image to unlock the upper cover.
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Slide and Separate the Upper Cover: Insert your tape-wrapped flathead screwdriver into the gap and slide it in the direction indicated by the arrow to start separating the upper cover.
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Remove the Upper Cover Completely: Twist the flathead screwdriver gently in the direction of the arrow to fully remove the upper cover.
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Remove the Cap: Use your tape-wrapped flathead screwdriver to carefully remove the battery cap.
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Remove the Old Battery: Use the tape-wrapped flathead screwdriver to gently pry out and remove the old battery.
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Insert the New Battery: Place the new CR2032 battery into the transmitter with the positive (+) pole facing upwards.
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Install the Cap: Place the battery cap back into its position.
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Install the Upper Cover: Snap the upper cover back onto the key fob, ensuring it’s securely in place.
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Install the Lower Cover: Insert the tabs of the lower cover into the slots on the transmitter and push it into place to reinstall the lower cover.
Important Cautions and Tips for Key Fob Battery Replacement
- Battery Type: Always replace with the correct battery type (CR2025 for Type A, CR2032 for Type B) or an equivalent. Using a different type could damage your key fob.
- Correct Installation: Ensure the battery is installed with the positive (+) pole facing upwards as indicated. Incorrect installation can lead to battery leakage and damage.
- Handle with Care: When replacing the battery, avoid touching the internal circuitry and electrical terminals. Be careful not to bend the terminals or allow dirt to get inside the transmitter, as this could cause damage.
- Battery Disposal: Used batteries should be disposed of properly. Insulate the positive and negative terminals with tape, never disassemble, throw into fire or water, or deform/crush them. Check your local regulations for battery disposal.
- Professional Recommendation: While DIY replacement is possible, Mazda recommends having the battery replaced at an Authorized Mazda Dealer to prevent any potential damage to your key fob. If you are uncomfortable with these steps, it’s always best to seek professional assistance.
Conclusion
Replacing the battery in your 2020 Mazda CX-5 key fob is a simple maintenance task that can save you from being stranded. By following these step-by-step instructions and taking the necessary precautions, you can easily restore your key fob’s functionality and ensure you continue to enjoy the convenience of your Mazda CX-5’s keyless entry system. If you encounter any difficulties or are unsure about any step, don’t hesitate to contact your local Mazda dealer for assistance.
