How to Test Lexus RX350 Key Fob After Battery Replacement

Ever found yourself stranded with a dead key fob battery? Frustrating, right? Imagine being able to easily replace it yourself in a few simple steps. That’s where this article comes in – to help you tackle the task of changing the key battery for your Lexus RX350 effortlessly.

You’re busy, and a malfunctioning key fob is the last thing you need. In just a few minutes, you’ll learn how to swap out the battery like a pro, saving you time and hassle. Say goodbye to expensive dealership visits or waiting around for assistance – take control of the situation and get back on the road in no time.

Step 1: Gather the Necessary Tools

To start the key battery replacement process smoothly, you’ll need a few essential tools. Here’s what you should gather before diving into the task:

  • Replacement key fob battery
  • Small flathead screwdriver or a coin
  • Tweezers or small pliers

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Having these tools at hand will make the battery replacement process much easier and quicker for you.

Step 2: Locate the Key Fob Battery Compartment

When replacing the key fob battery for your Lexus RX350, the next crucial step is finding the battery compartment. Here’s how you can locate it efficiently:

  • Search for a small slot on the side or back of your key fob.
  • Slide the small flathead screwdriver or coin into the slot to gently pry open the case.
  • Be careful not to damage the key fob while opening it.

This step is essential to access the key fob battery for replacement.

Step 3: Remove the Old Battery

Now that you’ve located the key fob battery compartment, it’s time to remove the old battery. Follow these steps to successfully complete this task:

  • Open the key fob case: Carefully pry open the case using a flathead screwdriver or a coin. Be gentle to prevent any damage to the key fob.
  • Locate the old battery: Inside the key fob, you’ll find the old battery that needs to be replaced.
  • Remove the old battery: Use a tool like tweezers to take out the old battery from its slot. Ensure you note the position of the battery before removing it to insert the new one correctly.

Important Note:

Make sure to dispose of the old battery properly by following your local regulations for battery disposal.

Key Points Details
Opening the case Use a flathead screwdriver or coin
Removing the battery Be cautious with the key fob structure
Disposing of the old battery Follow local regulations

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Remember, each step you take brings you closer to successfully changing the key battery for your Lexus RX350.

Step 4: Insert the New Battery

Now it’s time to insert the new battery into your Lexus RX350 key fob. Follow these simple steps to ensure a successful battery replacement:

  • Take the fresh battery and carefully place it in the same position you removed the old one from.
  • Ensure that the positive(+) and negative(-) sides of the battery align correctly with the markings or indicators in the key fob.
  • Gently push the battery down to lock it in place securely within the fob casing.
  • Once the new battery is inserted, you can now close the key fob case by aligning both halves and pressing them together firmly.

Enjoy the reliable performance of your key fob with the new battery properly installed.

Step 5: Test the Key Fob

Now that you’ve replaced the battery in your Lexus RX350 key fob, it’s time to ensure it’s functioning correctly. Follow these steps to test the key fob:

  • Distance Check: Stand a few feet away from your car and press the buttons on the key fob to check the range.
  • Lock and Unlock: Test the lock and unlock buttons to confirm they are working smoothly.
  • Trunk Release: If your key fob has a trunk release button, verify that it opens the trunk.
  • Panic Button: Press the panic button to check if it triggers the alarm.
  • Key Fob Battery Indicator: Pay attention to any low battery indicators on the key fob.

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Test Result
Distance Check Within range
Lock and Unlock Smooth
Trunk Release Functional
Panic Button Alarms
Battery Indicator No warnings

Enjoy the convenience and reliability of your key fob with the new battery.


That’s it! By following these steps and testing your key fob after changing the battery, you can ensure that it functions properly. Testing is key to enjoying the convenience and reliability of your Lexus RX350 key fob with the new battery. Now you can confidently use your key fob knowing that it’s working as it should. Happy driving!

Frequently Asked Questions

Q: Why is testing the key fob after replacing the battery important?

A: Testing ensures proper functionality of key fob features like range, lock/unlock, trunk release, panic button, and battery indicator with the new battery.

Q: How can the range of the key fob be tested?

A: Stand at various distances from the car and press the lock/unlock button to check if the car responds.

Q: What should be checked to ensure the lock and unlock functions are working?

A: Confirm that the doors lock and unlock as expected by pressing the corresponding buttons.

Q: How can the trunk release feature of the key fob be tested?

A: Press the trunk release button to verify that the trunk opens and closes properly.

Q: How can the panic button on the key fob be tested?

A: Press the panic button to check if the car’s alarm system is activated and deactivated correctly.

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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