Lexus ES 350 Key Fob Battery Replacement: A Simple Guide

Is your Lexus Es 350 Key Fob not working? Don’t worry, you’re not alone. The most common culprit is often a dead battery, and thankfully, replacing it is a straightforward process you can do yourself. This guide will walk you through identifying the right battery and replacing it, ensuring you’re back on the road quickly.

Identifying the Correct Battery for Your Lexus ES 350 Key Fob

Lexus ES 350 key fobs typically utilize common and inexpensive batteries. You’ll generally need a CR1632, CR2032, or CR1632 battery, depending on your specific model year. To be absolutely certain, you can use an online battery finder tool by inputting your Lexus ES 350’s year, make, and model. These batteries are widely available online for under $6, making this a very affordable fix.

Step-by-Step Guide to Lexus ES 350 Key Fob Battery Replacement

The method to open your Lexus ES 350 key fob varies slightly depending on the age of your vehicle.

For Newer Lexus ES 350 Models:

1. Locate the hidden key within your key fob and remove it.
2. Insert the key into the designated slot on the key fob. This slot is specifically designed to help pry open the case.
3. Gently twist or lever the key to separate the two halves of the key fob casing.

For Older Lexus ES 350 Models:

1. Inspect your key fob for a small notch or seam.
2. Use a thin, flat object like a small flathead screwdriver or a plastic pry tool.
3. Carefully insert the tool into the notch and gently pry open the key fob casing.

Battery Replacement for All Models:

1. Once open, carefully lift the circuit board to expose the battery compartment.
2. Take note of the battery’s orientation before removing it. This will ensure you install the new battery correctly.
3. Remove the old battery and replace it with the new battery, ensuring the polarity matches the original battery position.
4. Carefully reassemble the key fob casing, ensuring it snaps securely back together.

After replacing the battery, test your Lexus ES 350 key fob by pressing the buttons to lock, unlock, or start your vehicle remotely. If it doesn’t work immediately, double-check the battery connections to ensure they are clean and making good contact.

Understanding Different Types of Key Fobs

While focusing on battery replacement, it’s helpful to understand the different types of key fobs you might encounter:

1. Standard Remotes: Basic remotes with standard lock/unlock functionality.
2. Flip Keys: Keys attached to the remote that flip out for ignition.
3. Remote Heads: Keys integrated into the remote, not retractable.
4. Fobik Keys: Remotes with a separate, hidden key blade.
5. Smart Keys: Often associated with push-to-start systems, offering advanced features.

Troubleshooting and When to Consider Key Fob Replacement

If replacing the battery doesn’t solve the problem with your Lexus ES 350 key fob, you might have a more complex issue. In such cases, consider searching for video tutorials specific to your Lexus ES 350 key fob battery replacement on platforms like YouTube. KeyFobsPlus also offers helpful videos on our YouTube page. If issues persist after troubleshooting, it may be time to consider a complete Lexus ES 350 key fob replacement.