Is your Lexus ES350 key fob not working like it used to? It might be time to change the battery.
You don’t need to visit a dealer or spend money on a replacement when you can do it yourself quickly and easily. In this guide, you’ll learn step-by-step how to open your key fob, swap out the old battery, and get your remote working perfectly again.
Keep reading to save time, avoid frustration, and stay in control of your car’s security.
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Identify Your Key Fob Type
Knowing your Lexus ES350 key fob type helps change its battery correctly. Different models may use different fobs. Each type has unique features and battery access methods. Identifying the type saves time and avoids damage.
Look at the shape and buttons on the fob. Check for a small seam or release button. Some key fobs have a mechanical key hidden inside. Others have a smooth, sealed case.
Standard Key Fob
The standard key fob is compact and rectangular. It has buttons for lock, unlock, and panic. Usually, it has a small notch or slot to pry open the case. This type often uses a CR2032 battery. You can find the battery inside after splitting the case carefully.
Smart Key Fob
The smart key fob looks sleek and smooth. It usually has no visible screws or openings. A hidden mechanical key is inside for emergencies. Press a small button to release this key. The battery compartment is inside and requires gentle prying to open. This fob often uses a CR1632 or CR2032 battery.
Keyless Entry Remote
This fob type has more buttons and a larger body. It controls additional features like trunk release. The case often has a visible seam around the edges. Use a flat tool to separate the halves. Inside, you will find a coin cell battery. This type commonly uses CR2032 batteries.
Gather Necessary Tools
Before you start changing the battery in your Lexus ES350 key fob, gather all the tools needed. Having the right tools makes the process faster and easier. It also helps prevent damage to the key fob.
Use simple tools that are easy to handle. You do not need expensive or complex equipment.
Flathead Screwdriver
A small flathead screwdriver is essential. It helps to gently pry open the key fob case. Choose one with a thin tip to avoid scratching the plastic.
Replacement Battery
Buy the correct battery type for your Lexus key fob. Most ES350 models use a CR2032 battery. Check your old battery or the user manual to confirm.
Soft Cloth Or Towel
Use a soft cloth to protect the key fob from scratches. Place the key fob on the cloth while working. It keeps the key safe and clean.
Small Container
Keep a small container nearby to hold tiny screws or parts. This prevents losing them during the battery change. Safety first.
Locate The Battery Compartment
Before changing the battery in your Lexus ES350 key fob, find the battery compartment first. This step is simple but important. Knowing where the battery sits helps you avoid damage to the key fob. It also makes the replacement quick and smooth.
The battery compartment is usually hidden to protect the battery. You will need to open the key fob carefully. Use a small tool or your fingernail to pry it open gently. Avoid using too much force to prevent cracking the plastic.
Check The Back Of The Key Fob
Look at the back side of your Lexus key fob. Most models have a small seam or slot here. This is where the key fob splits into two parts. The battery compartment lies inside this split. Find a small notch or indentation to start opening.
Use The Mechanical Key
Remove the mechanical key from the fob first. Press the button to slide it out. The mechanical key can help open the battery compartment. Insert the key or a small flat tool into the slot. Twist gently to pop the cover open.
Identify The Battery Cover
The battery cover looks like a small panel on the key fob. It may have a tiny screw or just snap in place. Some covers have a symbol or mark showing battery location. Once found, carefully lift or slide the cover off to reveal the battery.
Open The Key Fob
Opening the key fob of your Lexus ES350 is the first step to change its battery. The process is simple and requires only a few tools. You will carefully separate the two halves of the key fob to access the battery inside. Follow these clear steps to open your key fob without damage.
Use A Flathead Screwdriver
Find a small flathead screwdriver. Insert it gently into the seam of the key fob. Apply light pressure to avoid scratching the plastic. Slowly twist the screwdriver to create a small gap. This gap will help you pry the key fob open. Be patient and work carefully.
Separate The Key Fob Halves
Once the gap is visible, use your fingers to pull the halves apart. Hold the key fob firmly but gently. Separate the two halves slowly to prevent breaking any clips inside. The battery will now be visible and ready for replacement. Keep the key fob parts safe for reassembly.
Remove The Old Battery
Start by carefully opening the Lexus key fob to access the battery compartment. Gently lift and remove the old battery without damaging the contacts. Make sure the area is clean before placing a new battery.
Locate The Key Fob Seam
Start by finding the small seam on the Lexus ES350 key fob. This seam divides the two halves of the fob. It is usually along the edge. Use your fingernail or a flat tool to gently pry it open. Be careful not to scratch or damage the plastic.
Open The Key Fob Case
Insert a flathead screwdriver or a coin into the seam. Twist it slowly to separate the halves. The case should open with little effort. Avoid forcing it to prevent breaking the clips inside.
Inside, locate the round battery. Note its orientation before removal. Use a small tool or your finger to lift the battery out carefully. Dispose of the old battery properly. Do not touch other parts inside the fob.
Insert The New Battery
Inserting the new battery into your Lexus key fob is a simple step. It ensures your key fob works properly and lasts longer. Careful handling helps avoid damage and keeps your key safe.
Check Battery Orientation
Look at the new battery closely. Notice the plus (+) and minus (-) signs. Match them with the markings inside the key fob. Incorrect placement will stop the key fob from working. Take your time to align the battery correctly.
Secure The Battery In Place
Once the battery is aligned, gently press it into the slot. Make sure it fits snugly without moving. Avoid pushing too hard to prevent damage. The battery should stay firmly inside when the key fob closes.
Reassemble The Key Fob
Reassembling the Lexus ES350 key fob is a simple but important step. It ensures the key works properly after changing the battery. Take care to put each part back in the right place. Follow these steps carefully to avoid any damage.
Align The Key Fob Halves Correctly
Place the two halves of the key fob next to each other. Match the edges and buttons carefully. Make sure the battery sits flat inside its compartment. Check for any loose pieces before closing.
Snap The Key Fob Together Firmly
Press the key fob halves together firmly. You will hear a click when they lock in place. Do not force it too hard. If it does not snap easily, check alignment again.
Test The Key Fob Functions
Press the buttons to test if they work. Lock, unlock, and panic buttons should respond. If something feels stuck, open the fob and try again. The key fob must work perfectly before you finish.
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Test The Key Fob Functionality
Testing the key fob functionality is an important step after changing the battery. It ensures the key fob works properly with your Lexus ES350. Without this check, you may face issues opening or locking your car.
Simple tests can confirm if the battery replacement was successful. This saves time and avoids frustration later. Follow these easy steps to verify your key fob’s performance.
Check The Lock And Unlock Buttons
Press the lock button once. Watch for the car’s lights or sounds. They should respond quickly. Next, press the unlock button. The car should unlock without delay. If nothing happens, the battery may not be installed correctly.
Test The Panic Alarm Feature
Hold the panic button for a few seconds. The car’s alarm should activate. This test shows the key fob sends signals well. Turn off the alarm by pressing any button afterward.
Try The Trunk Release Button
Press the trunk release button. The trunk should open or pop up. This confirms the key fob controls all functions. If the trunk does not respond, check the battery again.
Verify The Key Fob Range
Walk away from the car slowly while pressing buttons. The key fob should work from a reasonable distance. If the range is very short, the battery might be weak or the fob damaged.
Troubleshooting Common Issues
Troubleshooting common issues with your Lexus ES350 key fob helps save time and frustration. Small problems can stop the key fob from working properly. Knowing how to spot and fix these issues can keep your key fob in good shape.
Key Fob Not Responding
The key fob may stop working due to a weak battery. Replace the battery if the buttons do not work. Dirt or debris inside the key fob can block signals. Clean the key fob gently with a soft cloth. Sometimes, the key fob needs to be reset. Try pressing the lock and unlock buttons together for a few seconds. If the key fob still does not respond, check the car’s receiver system. A visit to a Lexus dealer might be necessary for advanced problems.
Battery Drains Quickly
If the battery dies fast, the key fob might have a short circuit. Avoid pressing buttons too often or holding them down. Extreme temperatures can also cause battery drain. Keep the key fob away from heat and cold. Using cheap batteries can reduce battery life. Always use high-quality batteries recommended for your key fob. Check for worn-out parts inside the key fob. Replacing damaged parts can improve battery performance and key fob life.
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Frequently Asked Questions
How Do I Open The Lexus Es350 Key Fob?
To open the Lexus ES350 key fob, locate the small notch on the side. Use a flat screwdriver or coin to gently pry it open. Be careful not to damage the casing while separating the two halves.
What Type Of Battery Fits The Lexus Es350 Key Fob?
The Lexus ES350 key fob uses a CR2032 lithium coin battery. This battery is widely available and provides long-lasting power for the key fob’s functions.
How Often Should I Replace The Lexus Key Fob Battery?
Typically, replace the Lexus key fob battery every 1 to 2 years. Signs include weak signals or reduced remote range. Prompt replacement ensures reliable keyless entry and start functions.
Can I Change The Lexus Key Fob Battery Myself?
Yes, you can change the Lexus key fob battery yourself. It requires no special tools, just a small screwdriver or coin. Follow instructions carefully to avoid damaging the key fob.
Conclusion
Changing the battery in your Lexus ES350 key fob is simple and quick. You just need a small tool and a new battery. Follow the steps carefully, and your key fob will work like new again. This saves you a trip to the dealer or locksmith.
Keep a spare battery handy to avoid problems later. Now, you can unlock and start your car without worry. Easy to do. Easy to keep your car ready.
