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Lexus Key Replacement – Replacing a Remote Or Fob The battery in your key fob will eventually wear out, regardless of whether you have the standard Lexus Key that switches the ignition, or an intelligent key for your vehicle that starts by pressing a button. It's easy to replace it with the help of a paperclip. Simply take out the battery that was in use, and then insert the new one (refer to the owner's manual for the type of battery that you need) and then clip it back in the correct position. Keys Lexus keys are not easy to replace and require a specialist locksmith for car keys to create a working spare. Every Lexus key has an embedded microchip that must be programmed to connect with the immobiliser system in your vehicle. It requires a lot of time and specialized equipment to allow this process to be carried out correctly. Each model has its own programming procedure. Replacing a key or remote fob is an expensive service and should be left to experts unless you have the proper tools and knowledge. It doesn't matter if you have a standard key that turns in the ignition barrel or a smart key that starts the car with the click of an arrow either way, they will need their batteries replaced. You can save money by doing this yourself but it will require the use of a small Phillips screwdriver, an old coin (a 20p piece works well) and a paperclip. You will find two or three screws on the back of the fob that holds the key. Remove them and then store them in a safe place (they are small and easy to lose). Remove the fob, which will reveal a circular indentation where the metal key will be. Pop the battery out with the help of a paperclip. Insert the new battery, ensuring that it's inserted correctly. Clip the inside of the key back to. Remotes Lexus remotes and fobs can be difficult to replace and require locksmiths who are both well-versed and have the proper tools. Some models require the transponder within the key to be reprogrammed in order to function with the immobiliser of the vehicle. The Lexus models use different methods to program these chips. This is done using an electronic device that transmits an electrical signal to the chip which matches the code used to unlock the doors and start the engine. Certain Lexus vehicles are designed with a system that combines the key head and remote. These are easier to replace because there is no chip that needs to be replaced. This type of key is also less expensive. Whatever the type of key no matter what type of key it is, all fobs eventually run out of battery power. It can be quite frustrating, but with a little know-how you can get your Lexus back to normal. First, check the owner's manual to identify the kind of battery you require and locate a replacement. Find a small hole in the inside of the fob, and insert coins (a 20p piece works best) and twist. You should see a flat surface that you can get rid of using an ordinary paperclip. Then, take the old battery off and insert the new one. Be sure to insert the battery in the proper orientation. Then, clip the outside of the fob back together and reconnect the key to the metal. Transponder Chips Transponder chips are in the key heads of a majority of new cars built since 1995. They can be used to disable immobiliser systems. The head of a key that includes a transponder chips can be removed to reveal a metal L-shaped key. A transponder chip replacement key or fob is a multi-stage procedure. It involves cutting the keys accurately and programming the chip to sync up with the vehicle's immobiliser. Transponders are chips that has Non-Volatile Memory. It has a set windings that are fine wires wrapped around the tube. They look similar to those in an electric motor. These windings create a coded message that the car can read. If the code is correct, then the car will allow you to start it. There are locksmith lexus keys of transponder chips. The first is called the 80-bit, while the second is called the circle + (General Motors). The first is reusable but it needs to be unlocked by a specific machine in order to function in a compatible vehicle. The latter type is more difficult, as the older keys are usually broken and drilled or thrown away when key cases are replaced. They can be salvaged, however and then used to create the service key, which doesn't require batteries to operate. Immobiliser Systems An immobiliser system is an electronic security measure that prevents thieves from starting your vehicle. It works by sending a signal from your vehicle to your key when you attempt to start it. The electronic chip inside your key responds with an unique code that must match the one found in the vehicle in order to start. If the codes don't coincide, your engine will stop immediately to prevent theft. Modern smart keys and fobs contain an embedded transponder, which stores electronic security information in a format that can't be copied easily. When your key or fob is installed in the ignition it transmits the code to a receiver within the ECU. The ECU then compares it with the code that is stored in its memory and then activates the fuel system and ignition circuit if the two match. If the codes do not match, the engine will not start, even when the ignition circuit is cut off by a criminal. Replacing a key or fob is a multi-stage procedure that involves accurate cutting of the new key blade, and programming it to work with the immobiliser system of your vehicle. Each immobiliser system is distinct and has its own unique programming procedure. We use Ross-Tech software to ensure that your replacement key is programmed correctly to ensure optimum performance and maximum security.