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Replacing a Toyota Key Fob Your Toyota key fob is packed with sophisticated technology that makes it work. This includes remote locking and smart keys, among other functions. It's not surprising then that it could malfunction. It's cheap and easy to replace the battery on your Toyota keyfob. Follow the steps below. Battery Toyota key fobs contain a small battery that powers their electronics which includes the transponder chip, which allows you to unlock your car. As you use your key fob it will eventually wear out and it will need to be replaced. Replacing the battery on a Toyota key fob is easy and inexpensive, and it will make your key fob functional. Insert any flat tool, such as a screwdriver or coin, into the notch on the case. This will break the two parts of the case for your key fob. On the side of the key fob's half you'll find a circuit board and the battery. Gently lift the circuit board to reveal the battery, and remove it from the case. Note down (or take a photo) of what kind of battery it is, and how it is placed in the case, so that you are able to find a replacement. Replace the battery with a new CR2032 3V and insert it inside the key fob with the negative side facing downwards. Reassemble the case and test your keyfob to ensure it works. If it does not, repeat the test, making sure that the connections are clean and in contact with the battery. If the key fob doesn't work after all of this, it could need to be programmed. Case Sometimes the case of your Toyota key fob will require replacement. The key fob could be damaged or the battery could fail. The replacement of the Toyota key fob case is fairly simple. You can buy the replacement case at your local hardware store or even online. However, replacing the electronics within is a bit more complex. Contact the Toyota dealership for assistance. It is necessary to remove the key from its case. This is typically done by pressing a key or sliding an latch. Once your key is removed then look for the small notch or slot on the outside of the case. Use a flat tool such as a screwdriver into this notch and then open the case. After the case has been opened, carefully lift the circuit board in order to reveal the battery. Take note of the kind of battery it is, and where it fits in the case, as you'll need to replace the battery. Most Lakeland stores offer new batteries. Take the battery you have in the past or photo as a reference to ensure you buy a replacement battery that is the same model. Once you receive the new battery, you need to carefully insert it into your keyfob. Check it to make sure it functions. Electronics The electronic components inside your key fob will allow it to unlock your car and begin the engine. The components comprise a transmitter, receiver and the physical key itself. These devices are all powered by the battery that is in your key fob. You won't be able to access your vehicle in the event that this battery fails. Luckily, motorists can replace the battery on their Toyota key fobs. This will restore the function of your key fobs and prevent theft. If your key fob isn't working it could be due to a defective receiver module. These modules are less delicate than the transponder in the toyota replacement key and can be easily replaced for a lower price. To ensure that the replacement is done correctly, it is important to use a key repair shop that has extensive experience in this field. To replace the battery in your Toyota key fob you will first need to remove the case. Insert an instrument that is flat, such as a screwdriver, a mini-screwdriver, or a coin into the notch visible on the case. After inserting the tool, you need to gently pry the two halves of the case apart. Once the case is separated, you can remove the circuit board and view the battery. Take a photo of the battery to match it with a new one in case you have to replace it. Once you have removed the battery from the old one and replaced it with a new CR 2032 3V battery with the negative side down. Make sure that the new battery is the same type as the one you had previously. Reassemble the case after installing the new battery and then test it. If the key fob does not function after reprogramming it the device, it may require replacement. It is recommended to take your vehicle to an authorized Toyota dealer to have this work done professionally. Programming If you've replaced the battery on your key fob, but it still doesn't work, the problem may be with the circuit board. In this instance, it's best to purchase the whole new Toyota key fob. You can buy one online, from a locksmith or at the dealership. You can change the key's programming yourself if you're comfortable. You will need an uncut Toyota Transponder Key. You can get it from a dealer, locksmith, or online. Once you have a brand new transponder, you need to insert it into the ignition but do not turn it. Press and release the brake pedal and the gas pedal simultaneously. Repeat this for about 20 seconds or until the security light on the dashboard goes off. Then, you can replace the original key and test it to ensure it is working. Toyota key fobs use an intricate system for communicating with cars. These keys are designed to only communicate with the specific vehicle they're inserted into. Reprogramming these keys is expensive and time-consuming as they must meet legal requirements. You may need the circuit board of your toyota replacement key fob to be reprogrammed by an auto dealer if the key is not working. www.g28carkeys.co.uk 's not an inexpensive option but it can ensure that the key works effectively and shields your car from theft. If the issue isn't caused by a damaged battery, it can be more expensive to repair than replacing the entire key fob. You can replace the battery inside your key fob from Toyota when it has stopped working or failed to function. It is a simple process, but you will need an instrument that is specifically designed to get to the inner workings of your toyota key fob. To open the case, you have to remove the clip on the back of the fob, and then gently pry it apart. Replace the battery with a new CR2032 battery. Be sure to install it correctly. After you have put in the battery, close the case by snapping it shut.