Lexus Key Fob Battery Replacement (Step by Step) +7 Tips

Recently, cars have been manufactured to have a lot of electronic parts, and the key fob is also part of these electronic parts.

Within the fob, an electronic chip works as a transmitter; it transmits the signal when you press the button to open the door.

If you experience difficulty using the key fob in operating your Lexus car, this might be a sign that you need a Lexus key fob battery replacement.

As you continue reading this article, you will learn how to perform a Lexus key fob battery replacement, how to maintain your Lexus key, the signs you notice before your Lexus key dies out completely, and lots more.

Let’s begin!

Your Lexus key fob runs on a CR2032 lithium battery. This type of lithium battery is a flat and round battery. One easy way to get the right replacement battery size is to order online from a Lexus-approved spare part dealership.

Check out this video for more tips on how to perform a Lexus key fob battery replacement

Lexus Key Battery Replacement Cost

It cost about $6 to replace a Lexus key battery yourself. You just need to get the battery from a shop and you can perform the replacement yourself as it is very easy to do.

You can purchase a key fob replacement shell from many retailers and simply swap out the guts of your old fob for the new one, which shouldn’t cost you more than $50. At the same time, install a fresh battery—which should be less than $6. Your new and improved fob is ready to go.

Also Read: VW Key Fob Battery Replacement (Step-by-Step Guide)

How Long Does a Lexus Key Fob Battery Last

A tiny battery powers the Lexus key fob. The battery usually has a life span of 2 and 3 years in a smart key fob and within 4 and 6 years for a regular key fob.

The difference between their battery life is that the smart key fob comes in a pair of two; the transmitter being the key fob and the receiver.

This is done almost invariably in the car with which the key fob communicates information. Unfortunately, In many vehicles, the key fob does not possess a rechargeable battery; therefore, once it loses its charge, it must be replaced.

You will receive a few warning signs as soon as the battery’s life span ends or when it’s getting low on charge. These signs include decreased range on the proximity detector, a low-battery sound when the engine is put off, and a dimmer LED indicator light.

If you notice these symptoms, you need a Lexus key battery replacement.

Symptoms of a Dying Key Fob Battery

Lexus Key Fob Battery Replacement

1. Poorer Signal Strength

Previously, your key fob was used to operate your vehicle across a radius of 80 -120 feet. However, over the past few days, you have begun to notice that you would be lucky; if the doors should unlock when you operate your fob, barely standing three feet away from your car.

In essence, if you have to get closer than 25 feet to unlock your vehicle, your key fob battery is getting weaker and needs a replacement as soon as possible.

2. Repeated Clicking

A fully functional key fob should be able to unlock doors with a single button press. Therefore, when you have to click repeatedly to ensure your vehicle is locked correctly, your battery needs replacement as soon as possible.

3. Inconsistent Results

Your key fob might be tricky sometimes and cause you to postpone its repair. However, it’s still advisable to troubleshoot your key fob to know if you need to update your auto key programming or may need a new battery.

Also Read: Keyless Start System Problem (Meaning, Causes & Fix)

How to Know a Weak Fob Battery

The key fob’s transmitter loses its effectiveness with increasing distance as the battery becomes weaker. This sign means you must be close to your car before your key fob works.

In other cases where your vehicle has a push-button start feature, your car may seldom recognize your smart key fob if the fob’s battery is weak.

In some vehicles, a message will come on the driver’s display that reads “key fob battery low.”

How Can You Troubleshoot the Fob Battery

In most cars, the key fob has a little LED light that acts as the feedback indicator whenever buttons are pressed on the key fob.

If the LED bulb does not illuminate, it is a sign that something is wrong with the key fob or its battery is dead.

To troubleshoot the fob’s battery, you can check its voltage with a voltmeter. For example, if the battery is a 3-Volt battery, and the voltmeter reads less than 3 Volts, the battery is weak and replaced.

Lexus Key Battery Replacement

Frequently Asked Questions – Lexus Key Fob Battery Replacement

What Kind of Battery Does the Lexus Key Fob Use?

The standard batteries used by Lexus key fobs are CR2025 and CR2032 3-Volt batteries. However, you can check the user’s manual to confirm the exact type.

Will the Car Start if the Fob Battery Is Weak?

Although a key fob’s battery might be weak, it should be able to start the vehicle. Although, you may have to bring the fob closer to the “Start” button or into a start slot. For Emergency cases, a key might also be kept inside or with the key fob.

How Do You Know if Your Car Key Battery Is Dying?

Most key fobs have a tiny LED indicator that blinks when the buttons are pressed. If the LED doesn’t illuminate, it means the battery is low on charge or the key fob has an issue. To ensure the battery is dead, you can use a multimeter to check its voltage. If it is anything less than 6 volts, you should replace it immediately.

What Happens When Your Key Fob Battery Is Low?

When your car’s key fob battery is low, you will still be able to drive around without much bother because the key is not required for the vehicle to run once you start the engine adequately. However, even though you can drive for a long time without the key fob, be careful never to let the car go off because you need the key fob to start the car.

When Should I Replace the Key Fob Battery?

Key fob batteries should be replaced when they become inefficient. However, the need for a replacement might come every 3-4 years, depending on the use and build quality. No one wants to be in a situation where your car’s key fob suddenly stops working when you’re far from home. It could be a bad experience.

How Long Does a Car Key Battery Last?

All Batteries have a life span. Therefore, the one in your car’s key fob will need to be replaced from time to time. A car key fob battery should last between 3-4 years. Although, several signs will tell you when your essential fob battery might be dying.

Conclusion – Lexus Key Fob Battery Replacement

Although knowing how to change your Lexus key fob battery may sometimes appear to be a headache, the advantages of owning a Lexus key fob far outweigh the disadvantages.

We hope this post was of help to you. Please feel free to check out our other blog articles if you want to get more tips for preventing car troubles!

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