How to Replace a Lexus Key Battery: Complete Step-by-Step Guide

Ever found yourself stuck outside your Lexus, frantically pressing the key fob with no response? Frustrating, right? That’s where knowing how to change the battery in your Lexus key can save the day. Imagine the convenience of never being locked out due to a dead battery again. In this article, you’ll discover a simple solution to this common issue.

Overview of Lexus Key Battery

To begin, let’s dive into the key component that keeps your Lexus key fob running smoothly – the battery. The battery powers the key fob, enabling you to lock, unlock, and start your vehicle with ease.

When your Lexus key fob battery runs low or dies, it can leave you stranded and unable to access your car. Knowing how to change the battery is essential to avoid this inconvenience.

Signs of a Low Battery

How do you know if your Lexus key fob battery needs replacing? Look out for these signs:

  • Diminished range when using the key fob.
  • Unresponsive buttons on the key fob.
  • Repeated need to press buttons for them to work.

Types of Batteries

Lexus key fobs may require different types of batteries depending on the model. Common types include CR1632, CR1616, and CR2032. Refer to your owner’s manual or consult a dealership to ensure you purchase the correct battery.

Changing the Battery

Ready to tackle the task of changing your Lexus key fob battery? Follow these simple steps:

  1. Locate the key fob’s battery compartment.
  2. Use a small tool to open the compartment.
  3. Carefully remove the old battery.
  4. Insert the new battery with the correct orientation.
  5. Close the compartment securely.

Proactive Maintenance

Regularly checking and replacing your Lexus key fob battery before it dies is a simple yet effective way to prevent being locked out of your vehicle unexpectedly.

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Now that you have a better understanding of the key role the battery plays in your Lexus key fob, you’re better equipped to ensure your vehicle remains accessible and functional at all times.

Identifying the Type of Battery Your Lexus Key Fob Needs

When it comes to replacing the battery in your Lexus key fob, one crucial step is identifying the correct type that your specific model requires. Here’s how you can determine the correct battery type for your Lexus key fob:

  • Check the Owner’s Manual: This is the quickest way to find out the specific battery type recommended for your Lexus key fob. The manual typically provides detailed information on the key fob and its required battery.
  • Inspect the Current Battery: If you have trouble locating the manual, you can open the key fob and remove the existing battery. Note down the battery type engraved on it for reference when purchasing a new one.
  • Online Resources: Lexus owners’ forums or the official Lexus website may also offer information on key fob batteries. You can search for your Lexus model to find the recommended battery type.

Remember, using the correct battery type is essential to ensure proper functioning of your Lexus key fob. By following these steps, you’ll be well on your way to selecting the right replacement battery for your key fob.

Tools Required for Changing the Lexus Key Battery

When changing the battery in your Lexus key, you’ll need a few essential tools to ensure a smooth process. Here are the items you should have on hand:

  • Small Flat-Head Screwdriver or Key Blade: You’ll need this tool to pry open the key fob casing.
  • Replacement Battery: Make sure to have the correct type of battery for your Lexus key fob. Refer to your owner’s manual or online resources for the specific battery model.
  • Tweezers or Small Pliers: These tools can be handy for safely removing the old battery from the key fob.

Having these tools ready before you start the battery replacement will help you complete the task efficiently. Remember, using the right tools can make the process much simpler and minimize the risk of damaging the key fob.

Step-by-Step Guide to Removing the Old Battery

When it comes to changing the battery in your Lexus key fob, the first step is removing the old battery. Here’s a simple guide to help you through this process:

  • Locate the Battery Compartment: Identify the small groove or slot on your key fob that allows you to access the battery.
  • Use the Key Blade or Screwdriver: Insert the key blade or a small flat-head screwdriver into the slot and gently twist to open the key fob casing.
  • Remove the Old Battery: Once the casing is open, you’ll see the old battery. Use tweezers or small pliers to carefully remove the old battery from its place.
  • Dispose of the Old Battery Properly: Be mindful of environmental concerns and dispose of the old battery in accordance with local recycling guidelines.
  • Inspect the Battery Compartment: Before proceeding, take a moment to check for any dust or debris inside the battery compartment.
  • Prepare for the New Battery: Ensure you have the correct replacement battery ready for installation.
  • Your key fob is now ready for a fresh battery with these simple steps to remove the old one.

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Installing the New Battery in Your Lexus Key

So, you’ve successfully removed the old battery from your Lexus key fob. Now, it’s time to install a fresh one and get your key back to full functionality. Here’s how to do it:

  • Choose the Correct Battery: Before anything else, make sure you have the correct replacement battery for your Lexus key fob. Double-check the type and size to avoid any compatibility issues.
  • Inserting the New Battery: Carefully place the new battery into the compartment, ensuring it’s oriented the right way. Follow the marks or instructions inside the key fob for proper positioning.
  • Closing the Casing: Firmly close the key fob casing, ensuring it snaps into place securely. A properly closed casing is essential to protect the battery and ensure the key functions correctly.
  • Testing the Key: Test your Lexus key fob to ensure the new battery is working. Check if the buttons respond as they should and that the key is communicating with your vehicle.
  • Final Checks: Once the new battery is installed and tested, make a final inspection. Ensure there are no loose parts, and the key fob is in good condition for regular use.

By following these steps, you can efficiently and effectively replace the battery in your Lexus key fob, ensuring continued reliable use.

Testing the Key Fob After Battery Replacement

Now that you have successfully replaced the battery in your Lexus key fob, it’s crucial to ensure that everything is functioning properly. Testing the key fob after the battery replacement is a simple but essential step to guarantee its effectiveness. Here’s how to do it:

  • Check Remote Functions: Test all the buttons on your key fob, including unlocking, locking, and opening the trunk. Confirm that each button responds correctly.
  • Proximity Key: Make sure the proximity function works by approaching your vehicle with the key fob. The doors should automatically unlock when you are in proximity.
  • Remote Start (if applicable): If your Lexus has a remote start feature, test it to see if the engine starts smoothly.
  • Key Detection: Try starting your car to ensure that the key is being detected properly and that the ignition activates without any issues.

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Remember, testing the key fob after a battery replacement is crucial to avoid any unforeseen problems. It ensures that your key fob is in good working condition, providing you with reliable access to your vehicle.


Make sure to follow the simple steps outlined in this guide to successfully change the battery in your Lexus key fob. Testing the key fob after battery replacement is key to ensuring it functions properly. By checking all the remote features and verifying key detection, you’ll have peace of mind knowing your key is ready for seamless use. Remember, taking care of your key fob can save you from unexpected hassles in the future. So, take a few minutes to replace the battery correctly and enjoy hassle-free access to your Lexus.

Frequently Asked Questions

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

If your Lexus key fob is not working consistently, it might signal a low battery. Look out for delayed responses or the need to be very close to the car for it to work.

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

To replace the battery, use a small flathead screwdriver to carefully pry open the key fob case. Remove the old battery and replace it with a new CR2032 battery, ensuring the correct polarity. Carefully close the case, making sure it snaps back into place securely.

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

Testing the key fob post-replacement ensures all functions work correctly, such as unlocking and locking the doors remotely, starting the vehicle (if applicable), and enabling the proximity key features. Proper testing prevents inconvenience and guarantees smooth key fob operation.

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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