How to Replace Battery in Lexus Key Fob: Step-by-Step Guide

Ever found yourself locked out of your Lexus because the key fob battery died at the worst possible moment? Frustrating, right? But fret not, because in this article, you’ll discover the simple steps to change the battery in your Lexus key fob. No more last-minute panic or unexpected locksmith bills – you’ve got this covered!

Imagine having the power to swap out your key fob battery in minutes, saving you time, money, and the hassle of being stranded. With just a few easy-to-follow instructions, you’ll be back in control of your vehicle access in no time. Say goodbye to the stress of a dead key fob and hello to convenience at your fingertips.

Step 1: Gather the Necessary Tools

To begin changing the battery in your Lexus key fob, you’ll need to gather a few essential tools. Here’s what you should have on hand:

  • New key fob battery (refer to your vehicle’s manual for the correct type)
  • Small flat-head screwdriver or a coin for opening the key fob
  • Tweezers for handling the battery
  • Clean cloth to keep your work area tidy

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Now that you have everything you need, you’re ready to move on to the next step in replacing your Lexus key fob battery.

Step 2: Identify the Battery Type

When it comes to identifying the battery type in your Lexus key fob, you’ll typically encounter two common types:

  • CR1632: A flat, round lithium battery often found in newer Lexus key fobs.
  • CR2025: Another flat, round lithium battery commonly used in older Lexus key fobs.
  • Refer to your Lexus key fob manual: It usually specifies the compatible battery model.
  • Inspect the current battery: The existing battery should have its type imprinted on it (e.g., CR1632 or CR2025).

Step 3: Open the Key Fob

Now that you know the battery type and have the replacement ready, it’s time to open your Lexus key fob. Here’s how to do it:

  • Look for a small button or switch on the key fob.
  • Press or slide it to release the key fob cover.
  • Once the cover is released, gently lift it off to access the battery compartment.

Remember, each key fob model may have a slightly different opening mechanism. If you’re unsure, refer to your key fob manual for specific instructions on how to open it securely without damaging it.

Step 4: Replace the Battery

Now that you’ve successfully opened the Lexus key fob, it’s time to replace the battery. Here’s how you can do it easily:

  • Gently remove the old battery: Carefully take out the existing battery from the compartment, making sure not to damage the key fob components.
  • Insert the new battery: Place the new CR1632 or CR2025 battery (depending on your key fob model) into the compartment with the correct side facing up.
  • Ensure proper positioning: Double-check that the battery is securely placed and sitting correctly in the compartment.
  • Close the key fob: Carefully align the cover back in place and press gently to snap it shut. Make sure it’s securely fastened to avoid any issues.

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Remember, changing the battery in your Lexus key fob is a straightforward process that you can easily do at home with the right battery type and a gentle touch.

Step 5: Test the Key Fob

Now that you’ve replaced the battery, testing the key fob is the final step to ensure everything works smoothly. Here’s how you can do it:

  • Press the buttons: Test all the buttons on the key fob to check if they are responsive.
  • Remote functions: Try unlocking and locking your car with the key fob to verify the remote functions.
  • Distance test: Walk a few steps away from your car and test the key fob’s range by pressing the buttons.

If everything is working correctly, congratulations! You’ve successfully changed the battery in your Lexus key fob. Enjoy the convenience of a fully functional key fob for your vehicle.


You’ve learned the essential steps to replace the battery in your Lexus key fob and the importance of testing it afterward. By following these instructions, you can ensure that your key fob functions properly, allowing you to conveniently lock and unlock your car. Remember to test the button responsiveness, remote functions, and range to guarantee that your key fob is in top condition. With these simple steps, you can maintain a fully operational key fob for your Lexus vehicle.

Frequently Asked Questions

How do I know if my Lexus key fob battery needs replacing?

To determine if your Lexus key fob battery needs replacing, look out for warning signs such as weak signal strength, unresponsive buttons, or the need to repeatedly press buttons to unlock or lock the car.

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What battery type is suitable for a Lexus key fob?

For a Lexus key fob, you typically need a CR2032 battery. It’s recommended to use a high-quality and reliable brand to ensure optimal performance.

How do I replace the battery in my Lexus key fob?

To replace the battery in your Lexus key fob, carefully open the fob using a screwdriver or a flat tool, remove the old battery, and insert the new CR2032 battery with the correct polarity (+/-).

What should I do after replacing the battery in my Lexus key fob?

After replacing the battery, test the key fob by checking the button responsiveness, ensuring the remote functions (locking, unlocking) work correctly, and testing the key fob’s range to ensure proper functionality.

How often should I replace the battery in my Lexus key fob?

It is recommended to replace the battery in your Lexus key fob every 1-2 years or when you notice signs of a weak battery to prevent any inconvenience due to a dead key fob.

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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