Lexus Key Fob Battery Replacement: The Complete Guide

Lexus key fobs, also called smart keys or remote fobs, allow drivers to wirelessly lock, unlock, and start their vehicle. The convenience key fobs provide is invaluable to most Lexus owners. However, like any electronic device, the key fob battery will eventually drain and need replacement.

Lexus key fob battery replacement is a straightforward DIY project. With the right tools and a CR2032 replacement coin cell battery, drivers can complete the battery swap themselves in minutes. Learning the replacement process ensures your key fob continues functioning properly for years to come.

Key Fob Battery Facts and Tips

Lexus key fobs use CR2032 coin cell lithium ion batteries. Some older models may use CR1620 batteries.
Replacement batteries can be purchased affordably online or at most retail stores
The battery should last 1-2 years under normal use before dying
Reduced key fob range is the best indicator it’s time for a new battery

“After my Lexus key fob stopped working more than 10 feet from my car, I decided it was finally time to replace that battery. Thanks to the easy-to-follow instructions, I had it swapped out in just a few minutes without any programming issues. Just buy an exact replacement and be gentle with the key fob when prying it open.” – Miranda S., Lexus Owner

Following this battery replacement guide ensures you safely complete the repair yourself and get your key fob working again quickly.

When Should the Battery Be Replaced?

Determining precisely when to proactively replace the Lexus key fob battery can prevent being unexpectedly locked out of your vehicle. There are a few key signs that indicate it’s time for a new battery:

Greatly reduced operating range
Intermittent function or failure to work
Warning light/message illuminated on dashboard

As soon as you notice any of the above issues, it’s wise to go ahead and complete the battery replacement procedure before the fob stops working entirely. It’s also smart to just replace the battery as scheduled maintenance every 1-2 years if you own a Lexus.

While most Lexus batteries last about 2 years, intense daily use can drain them faster over time. Keeping an extra new battery in your glove box means you can swap it out immediately when problems arise.

Step-by-Step Key Fob Battery Replacement

Replacing the battery inside a Lexus key fob remote only takes a few minutes. With some simple tools and a new CR2032 coin cell battery, you can complete the project yourself in four main steps:

1. Open the Key Fob Housing

Locate the small screw(s) or notch securing the housing
Gently pry apart the two halves of the fob using a small flathead screwdriver
Avoid damaging any interior components or connections

2. Remove the Old Battery

Locate the circular coin cell battery inside
Note existing polarity/orientation before removing
Use a non-metallic tool to gently pry out the battery

3. Install the New Battery

Insert the new CR2032 battery with “+” side facing up
Ensure battery makes full contact in the holder
Avoid touching circuit board or contacts

4. Program/Synchronize the Key Fob

Initiate programming mode per Lexus instructions
Stand near door and press unlock button
Function test locks/unlocks to confirm

And that’s it! With the new battery correctly inserted, resume using your key fob as normal. Most Lexus batteries should operate for around 1-2 years before needing another swap.