Your Toyota key fob comes with advanced technology to make it work. This includes remote locking and smart keys, among other features. So, it's not surprising that things could go wrong.
It's easy and inexpensive to replace the battery in your Toyota keyfob. Follow the steps below.
Battery
Toyota key fobs are powered by a tiny battery, which powers the transponder and electronics chip used to unlock your vehicle. As you use your key fob and the battery eventually wear out and will need to be replaced. Replacing the battery in a Toyota key fob is simple and inexpensive, and it will bring back the functionality of your key fob.
Insert a flat tool like a screwdriver or coin into the notch on the case. This will break the two halves of the key fob's case. On the side of one of the key fob halves, you will see the circuit board and the battery. Gently lift the circuit board to reveal the battery, and then remove it from the case. Note down (or take a photo) of the type of battery it is, and how it sits inside the case, so that you are able to find an alternative.
Replace the battery with a brand new CR 2032 3V battery and place it in the key fob with the negative side facing downwards. Reassemble the case and test the key fob to confirm that it is working properly. If it still doesn't work then repeat the test to ensure that the battery and the connectors are in contact. If the key fob still doesn't work after all of this, it could need to be programmed.
Case
The case of your Toyota keyfob may need to be replaced every now and then. This is usually the case if the key fob is damaged in any way, or if the battery dies. The replacement of the Toyota key fob is relatively easy. You can locate a replacement case online or in a local hardware store. The electronics inside are more difficult to replace. Contact the Toyota dealership for more assistance.
It is necessary to take the key out of its case. This is usually done by pressing a button or sliding the latch. Once your key is removed, look for a small slot or notch on the outside of the case. You can open the case by inserting an object that is flat, such as a small screwdriver, into this notch. Once the case is opened, carefully lift the circuit board in order to expose the battery. Note the kind of battery and where it is located inside the case. You will need to replace it.

The majority of Lakeland stores offer new batteries. Use the old battery or image as a reference to ensure that you purchase a replacement battery that is the same type. Once you receive the replacement battery, carefully insert it into your keyfob. Then check it out to ensure that it works.
Electronics
The electronic components inside your key fob are what tell it to unlock your car and begin the engine. These components comprise the transmitter, receiver and the physical key. Each of these devices is powered by the battery in the key fob. If the battery is damaged and you lose power, you won't be capable of accessing your vehicle. Fortunately, drivers can easily replace the battery on their Toyota key fobs. This will make them function properly and prevent the risk of theft.
If your key fob doesn't work it could be due to an issue with the module. These modules are less delicate than the transponder found in the replacement key for Toyota and can be repaired for a lesser cost. To ensure that the replacement is carried out correctly, it is essential to use a key repair shop with extensive experience in this area.
To replace the battery on your Toyota key fob, you'll have to open the case. Insert a flat tool, such as a screwdriver mini-screwdriver, or a coin into the notch that is visible on the case. Once you have inserted the tool, you have to gently pry the two halves of the case apart. When the case is removed, you can remove the circuit board and see the battery. Take a photograph of the battery to match it with a brand new one should you need to replace it.
Once you have removed the old battery then put in a brand new CR 2032 3V battery with the negative side down. Be sure that the new battery has the same type of cell as the previous. Reassemble the case after installing the new battery and test it. If your key fob still isn't working, it could need to be reprogrammed. This must be handled by a professional, t here fore it is recommended to get this done by a certified Toyota dealer.
Programming
If your key fob still doesn't work after replacing the battery, it could be the circuit board. In this instance it is recommended to purchase a brand new Toyota key fob. You can get one from a dealer or a locksmith online. You can change the key's programming yourself if you feel at ease.
The first step is to have first a blank Toyota transponder key. This can be obtained from a dealer, a locksmith, or an online source. Install the new transponder in the ignition without turning it. Press and release both the gas and brake pedals simultaneously. This should take up to 20 seconds or until the security light on the dashboard goes off. It is now time to replace the original key and test it.
Toyota key fobs have a complicated system that uses different signals to communicate with the car. They are designed to work only with the vehicle that they are inserted in. This is the reason why reprogramming them can be costly and time-consuming since they must conform to legal standards.
If your toyota aygo replacement key fob is not working, you may have to have the circuit board reprogrammed by an auto dealer. This is not a cheap alternative, but it will ensure that your car keys function properly and prevents theft. It could be more expensive to repair the fob if the issue isn't caused by a faulty battery.
If your Toyota aygo key fob battery has gone out of service or stopped working, you can replace it with a new battery. It is a simple process, but you will need a special tool in order to access the internal workings of your key fob. To open the case, you need to remove the clip from the back of the fob, and then gently remove it. Replace the old battery with a new CR2032 battery. Make sure you install it correctly. After putting the battery in the case, close the case and snap it shut.