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Lexus Key Replacement – Replacing a Remote Or Fob The battery in the key fob is going to eventually run out, whether you own the standard Lexus Key that turns on the ignition, or an intelligent key for your vehicle, which starts by pressing the button. The replacement process is simple with using a paperclip. Pop the battery that is in use and insert the new one (refer to your owner's manual to see which type of battery you require) and then secure it back into place. Keys Lexus keys can be difficult to replace. A specialist locksmith is needed to make a spare that works. Each Lexus key has an embedded microchip, which needs to be programmed in order to connect with the immobiliser system in your vehicle. lexus key fob TheKeyLab requires a lot time and equipment that is specially designed for this procedure to be completed correctly. Each model has its own specific programming process. Replacing keys or remotes is a costly task that you should leave to professionals, unless equipped with the proper tools and know-how. Whether you have a conventional key that is turned on in the ignition barrel or an electronic key that starts the car at the push of one button, both will eventually need their batteries replaced. This can be done yourself, but you will need an inexpensive Phillips Screwdriver, 20p coins and paperclip. There are two or three screws on the back of the fob for the key. Remove them and store them securely (they are small and easy to lose). Remove the fob and you will see an indentation that is circular for the key made of metal. Take the battery out (using the paperclip) and insert the new one ensuring it's the correct way up. Clip the inside of the metal key back together. Remotes Lexus remotes and fobs aren't easy to replace and require locksmiths who are well-versed and have the proper tools. Some models require the transponder inside the key to be reprogrammed in order to function with the immobiliser system in the car. The Lexus models use different methods to program these chips. This is done with an instrument that sends an electronic signal to the chip that matches the code used to unlock the doors and start the engine. Certain Lexus vehicles are designed with a device that combines the key head and remote. They are much easier to replace, as there is no separate chip needed. This type of key is also cheaper. All fobs eventually lose battery power, no matter the kind of key. This can be a very frustrating situation, but it's possible to get your Lexus back on track with a little knowledge. Refer to the owner's manual to determine which battery type you need. Find the replacement. Locate a small hole on the inside of your fob. Insert a coin (20p works well) into the hole and twist. The fob should be revealed as a flat spot that you can utilize a paperclip to take away. Then, take the old battery off and insert the new one. Be sure to insert the battery in the proper orientation. Finally, clip the inside of the fob back together, and re-insert the metal key. Transponder Chips Most new cars since 1995 have transponder chips embedded in the key head to disarm the immobiliser system. The head of a key which is equipped with a transponder chip may be removed to reveal a metal L-shaped key. Having a replacement key or fob made with a transponder chip is a multi-stage process that includes accurate cutting of the replacement keys and programming of the transponder chip so that it can synch up with the vehicle's immobiliser system. Transponders are electronic chip that has Non-Volatile Memory (NVM) which contains a set of windings (very fine wire twisted around a tube) which look similar to ones in an electric motor. These windings create a coded message that the car is able to read. If the code is correct, the car will start. There are two kinds of transponder chip, one known as the 80 bit and the other one is called a circle + (General Motors). The first kind is reusable, but it must be unlocked with a special machine to function in a different vehicle that is compatible. The latter is more difficult since the earlier keys are often damaged, drilled through or thrown away when key cases are replaced. However, they can be used with a key-service that does not require a battery. Immobiliser Systems An immobiliser system is an electronic security measure that prevents thieves from starting your car. It works by sending an electronic signal from the vehicle to the key every time you attempt to start it. The chip inside the key responds by transmitting a unique code that must match the one of the vehicle in order for it to start. If the codes do not match, the engine will immediately shut down to stop theft. Modern smart keys and fobs are equipped with embedded transponder chips that stores security information in a format that cannot be duplicated. When the fob or key are inserted into the ignition, they send this code to the ECU. The ECU analyzes this code in comparison to the one stored in its memory, and activates both the fuel system and the ignition circuit if they match. If the codes do not match then the engine will not start even when the ignition circuit has been damaged by a thief. The replacement of the fob or key involves a multi-stage procedure that includes cutting the new blade accurately and programming it so that it can be synced with your car's security system. Each immobiliser system is distinct and has its own unique programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly to ensure maximum performance and security.