How to Change the Battery in a Toyota Key Fob in 2021 | 7 Easy and Simple Steps

Wondering How to change the battery in a Toyota Key Fob? Using a key fob to unlock the car, allows you to get into the car super quick. However, there may come times when the system may not respond. There is no need to panic!

Most likely, your key fob battery needs to be replaced. A professional is not needed for this, you can get the job done by yourself. Our extensive guide will tell, how to change the battery in a Toyota key fob!

What is a Key Fob?

A key fob is basically a small electronic device, used in place of a key. It is designed to initiate an action with a press of a button.

A key fob can be used to unlock doors, or even to start a car. As soon as the button on the key fob is pressed, the wireless systems associated with it are triggered.

How do Key Fobs work?

The Key Fobs are programmed to open doors or any other action. The door consists of a reader and the key fobs use radio waves for communication with the reader.

A radio frequency identification (RFID) is utilized for the identification. This system operates as an electronic barcode.

Now, when the key fob is in the proximity of the reader, it opens the door. This is because the reader grants access to whoever has the key fob.

What are the benefits of using a key fob?


You don’t need to look for the key in your pocket and then use it to open the door. With a key fob, the doors can be opened with just a push of a button.


Key Fob to ensure safety. It becomes difficult to steal the vehicle because the thief would need the key fob to have the doors open.

Saves time and energy

With a push of a button, people can have the doors unlocked so they can quickly get in the car. Their time and energy will be saved through this.

What do you do if the battery in the key fob expires?

If you find out that the battery has died then don’t worry, you can use the metal key for the moment.

Later on, get a new battery and then replace it by removing the old battery from the circuit board. Don’t forget to discard the old battery. It is not needed anymore.

How do you open the key fob on a Toyota?

Newer Toyota Models

In the newer Toyota car models, simply, the hidden key can be used. The hidden key can be put in a slot that is specifically designed to have the key fob case opened.

Older Toyota Models

When it comes to older Toyota models, you can unlock the case of the key fob by using an object that is thin. A screwdriver can also be used.

Materials Required for Battery Replacement

  • A new battery
  • A thin object
  • Cotton swabs

Steps of How to Change the Battery in a Toyota Key Fob

Step 1: Removing the metal ignition key

The first thing that you need to do is to take out the metal ignition key from the key fob. You can do this by pressing a button that may be on the side or the bottom of the key fob. Make sure to place it in a safe place.

Step 2: Opening the key fob

In the newer models, you can use the hidden key to open the key fob. In the older models, any thin object can be used to open the key fob. You can gently use a screwdriver to get this job done.

Step 3: Removing the circuit board

Once you have opened the key fob, you will then need to carefully remove the circuit board.

Step 4: Removing the old battery

At the back of the green circuit board, you will find single round battery. This needs to be replaced so you can gently remove it from the circuit.

Gently clean the circuit with a cotton swab and get rid of any dirt or debris that may be deposited. There shouldn’t be any in the first place but if there is, you can clean it.

Step 5: Replacing the old battery with a new one

Next, you need to put the new battery in place of the old. You can discard the old battery because you don’t need it anymore.

Step 6: Reassembling the key fob

Once you have replaced the battery, you are now all set to reassemble the key fob.

Step 7: Putting the metal key back

Lastly, you need to put the metal key back in the key fob.

By following these 7 steps, you will have successfully replaced the key fob battery.

FAQ’s About Toyota Key Fob

What is the cost to change the key fob battery?

The battery replacement of a key fob is an inexpensive process. All you need to pay for is the new battery that you are going to get.

The battery may cost around $4-$9. It is a quick and easy process so generally professional help for it is not needed.

What size battery does the Toyota key fob take?

To find out the exact battery that the vehicle’s key fob takes, the owner’s manual must be seen.

However, the CR 2032 3V battery is the most commonly used in Toyota key fobs. So, if there is no owner’s manual then this battery can certainly be tried.

How long does a key fob battery last when operated regularly?

On average, a key fob battery lasts for around 3 to 4 years. After that, the system may stop responding. So, it will be a signal that the battery needs replacement.

Do you have to reprogram a key fob after replacing the battery?

Normally, you will not have to reprogram the key fob after replacing the battery because the code is stored in the system. The code should not be lost.

However, after the battery replacement if the key fob is still not working then you will need to reprogram the fob because the code might have been forgotten.

How much does it cost to replace a quality Toyota key fob?

Due to the advancement of technology, the cost of key fobs has risen.

Getting a replacement for a quality Toyota key fob may be more expensive now than it was a few years ago.

The total cost of the replacement of the Toyota key fob depends upon the vehicle.

However, it can range from anywhere between $200-$600. Again, this depends upon the vehicle!

Range of the key fobs?

The key fobs have different ranges of functioning. Some may have a range of several feet and some may have a range of several hundred feet.

How to Change Battery in Toyota Key Fob?

After using the key fob for a decent amount of time, you will notice that the key fob is not unlocking the car door.

The signals will be very low to catch from the transmitter. Hence, the action will not take place.

At this point, it will be found out that the Toyota key fob needs a battery replacement. There is no other indicator. You will have to judge it by yourself.

Common Problems for Key Fob of Toyota

Even though key fobs are much more convenient and safer as compared to the typical car keys. However, they have a few common problems.

Dead batteries

The first and the most common problem of the key fobs is that their batteries die over time.

Even though the batteries last for a decent period of 3-4 years but they may die sooner too.


You will have to buy a new battery and then replace it with the older one.

Misaligned buttons

Another very common problem that most people face when it comes to key fobs is the misalignment of buttons. You may be pressing the unlock button and may not see the action happening.


In the case of misaligned buttons, you need to open the key fob.

Once you have opened the key fob, clean the buttons, and get rid of any debris or dirt that may be deposited and align the buttons. After aligning the buttons, reassemble the key fob and it should work fine.

Broken Contacts

The key fobs go through a lot of physical abuse because they go everywhere with us.

Sometimes, they may even fall. So, there is certainly a chance of broken contacts in the remote. In case of broken contacts, the key fob may stop working.


To fix this problem, you will have to open the key fob. After looking at it, you will find out whether the internal contacts have been broken or not.

If some are seen broken then they will have to be soldered back in place. The contacts of the buttons can be broken as well.

So, soldering them back in place will fix the problem.

Wet key fob

If the key fob has been mistakenly dropped in water or any other liquid then this will certainly be a problem. The key fob may end up broken if you don’t act quickly.

Solution: To overcome this problem, you will have to dry out the key fob as soon as possible.

Start by opening the key fob and then using a dry wipe to absorb maximum water.

If you feel that there are any impurities then go ahead and use a cotton swab dipped in isopropyl alcohol to get rid of the impurities.

Then, try to dry it out as much as possible. After doing that, you can reassemble the fob and then try it out. It should most probably work.

How to Change Car Key Battery Toyota?

The programming of the Toyota key fob can be done easily. You need to first insert the new key that you intend to program into the ignition.

Next, turn the ignition ON. After around 8-13 seconds, you will notice that the security light will go on. It will be on for around 3 seconds.

The security light is an indication of the programming of the new key. If the security light doesn’t go on then the key has not been programmed.

It is now time to have a look at the step by step guide of how to change the battery of the Toyota key fob. So, without further ado, let’s have a look at the steps.

Maintenance of Key Fobs

There is not much that can be done for the maintenance of the key fobs. The maintenance of the key fob is pretty simple.

Just make sure that they don’t fall a lot. Also, make sure that you replace the batteries after every 3 years so that you don’t have to face the trouble of dead batteries.

After about a year, check the alignment of the buttons as well. Also, clean any debris or dirt that may be deposited inside the key fob.

Dos and DON’Ts

  • When opening the key fob, make sure that something very thin is used. Don’t use sharp objects for opening the key fob.
  • Don’t use any liquid for cleaning the inside the key fob. Use isopropyl alcohol only if there are any impurities. Always use a dry cotton swab for cleaning debris that may be deposited.
  • Reassemble the key fob carefully, make sure that you put everything into place.
  • If you do not know to solder then don’t try soldering the broken contacts.


The battery replacement process of a Toyota key fob is pretty simple and inexpensive. No professional help is needed for it as it can be done at home easily.

A new battery is needed and then after opening the key fob it can be easily replaced.

There is no need for any complex tools as well. No more relying on a professional for the battery replacement of a key fob!

We hope that this guide will help you in acing the battery replacement!


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