How to Replace Toyota Key Fob Battery & Test It Like a Pro

Ever found yourself locked out of your car because the key fob battery decided to call it quits at the worst possible moment? Frustrating, right? But don’t worry, you’re not alone in this struggle. Many of us have faced the dreaded dead key fob situation.

Imagine having the power to swiftly replace the battery in your Toyota key fob all by yourself, saving time and money on trips to the dealership. Sounds like a game-changer, doesn’t it? In this article, you’ll discover simple steps to breathe new life into your key fob and regain that sense of control over your vehicle access.

Gather necessary tools

When replacing the battery in your Toyota key fob, it’s important to have the right tools at hand. Here’s what you’ll need:

  • Replacement Battery: Ensure you have the correct type and size of battery for your Toyota key fob. Check the owner’s manual for specifications.
  • Small Screwdriver: You’ll likely need a small screwdriver to open the key fob casing. A precision Phillips-head screwdriver is commonly used for this task.
  • Flat Surface: Find a clean and flat surface to work on to prevent any small components from rolling away or getting lost.
  • Replacement Key Fob Battery Instructions: It’s helpful to have the replacement battery instructions nearby for guidance on the correct installation.

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With these tools ready, you’ll be well-equipped to proceed with replacing the battery in your Toyota key fob.

Identify key fob type

To begin the battery replacement process for your Toyota key fob, the first step is to identify the type of key fob you have. Here’s how you can do it:

  • Look for Model Number: Check the backside or inside the key fob for a model number or any identifying information. This will help you determine the specific type of key fob you are working with.
  • Consult Owner’s Manual: Your Toyota vehicle’s owner’s manual may also contain information about the key fob type. Take a look to see if there are any details or diagrams that can help you identify your key fob.
  • Online Research: If you are unable to find the information on the key fob itself or in the manual, consider doing a quick online search using the model number or any other markings you find on the key fob. This can often lead you to resources that identify the type of key fob you have.

By successfully identifying your Toyota key fob type, you’ll be better equipped to proceed with the battery replacement process.

Open the key fob

To replace the battery in your Toyota key fob, you first need to open it up. Here’s how you can do it:

  • Look for a small notch or a slot on the key fob.
  • Use a flathead screwdriver or a coin to gently pry open the key fob along the designated area.
  • Be careful not to apply too much pressure to avoid damaging the key fob casing.
  • Once you hear a click, the key fob should start to open up, revealing the inside components.

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Remember, opening the key fob is the first step towards replacing the battery successfully.

Replace the battery

When it’s time to replace the battery in your Toyota key fob, follow these simple steps:

  • Step 1: Locate the battery compartment on your key fob. It’s usually on the back cover.
  • Step 2: Open the key fob by looking for a notch or slot. Use a flathead screwdriver or coin to gently pry it open.
  • Step 3: Be cautious while opening the key fob to avoid damaging the casing.
  • Step 4: Listen for a click to indicate successful opening. This will reveal the internal components.
  • Step 5: Once open, remove the old battery carefully.
  • Step 6: Insert the new battery with the correct side facing up.
  • Step 7: Close the key fob by aligning the cover and pressing firmly until you hear a click.

Taking these steps will ensure that your Toyota key fob is ready to go with a new battery.

Test the key fob

When it comes to testing the key fob after replacing the battery, it’s crucial to ensure that everything is working as it should. Here are the steps you should follow:

  • Press the buttons: Test all the buttons on the key fob to make sure they are working properly. This includes the lock, unlock, trunk release, and panic buttons.
  • Check the range: Walk a few steps away from your vehicle and test the range of the key fob. Make sure it works from a reasonable distance.
  • Verify functionality: Ensure that the key fob successfully locks and unlocks your car. Test it multiple times to confirm consistent functionality.
  • Reprogram if necessary: If you notice any issues with the key fob’s performance after battery replacement, you may need to reprogram it. Check your owner’s manual for instructions on how to do this.

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Testing your key fob is the final step in ensuring that your Toyota key fob is in good working condition after replacing the battery.


That’s it! You’ve now learned how to easily replace the battery in your Toyota key fob. Remember to test all the functions to ensure everything is working smoothly. Keeping your key fob in top condition is essential for hassle-free usage. Enjoy the convenience of your fully functional key fob!

Frequently Asked Questions

How do I test if my key fob is working after replacing the battery?

After replacing the battery in your Toyota key fob, test it by pressing all buttons to check if they respond properly. Also, ensure the key fob has its original range of operation.

What should I do if my key fob stops working after changing the battery?

If your key fob stops working after a battery change, try reprogramming it following the manufacturer’s instructions. Contact a professional if issues persist.

Why is it important to test the key fob after battery replacement?

Testing the key fob post-battery replacement ensures all functions like locking, unlocking, and alarm activation are working correctly, avoiding inconvenience and potential security risks.

Can I replace the battery in my Toyota key fob myself?

Yes, most Toyota key fobs allow for easy battery replacement. Refer to the vehicle’s manual or the manufacturer’s instructions for the correct battery type and replacement procedure.

Battery industry professional with 5+ years of experience. Bachelor of Science in Electrical Engineering from Georgia Tech. Specializes in power systems and renewable energy.

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