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Lexus Key Replacement – Replacing a Remote Or Fob If you have a traditional Lexus key that switches on the ignition, or a smart key for your car, which starts with the press of an arrow, eventually the battery inside your key will go out. Replacing it is easy with a paperclip: Take the existing battery out and then insert the new one (refer to the manual for your owner to see which type of battery you need) and then clip it back in place. Keys Lexus keys aren't easy to replace. A specialist locksmith is needed to make an alternative that functions. This is because each Lexus key contains an embedded microchip that must be programmed to sync with the immobiliser system of your vehicle and if it's not, it'll not be able to start. It requires a lot time and specialized equipment to allow this procedure to be completed correctly. Each model has its own programming procedure. Replacing keys or remotes is a pricey task that should be left to experts, unless equipped with the proper tools and expertise. Whether you have a conventional key that turns in the ignition barrel or a smart key that starts your car at the click of an arrow Both will eventually require their batteries replaced. You can save money by doing it yourself, but it requires an inexpensive Phillips screwdriver, a 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. Unscrew them, and store them safely (they are small and easy to lose). The fob is removed, revealing an indentation with a circular pattern where the key made of metal will be. Remove the battery with the help of a paperclip. Insert the new battery, making sure that it's placed correctly. Then clip the inside of the key back together. Remotes Replacing the Lexus remote or fob can be difficult and requires expert locksmiths with both the right tools and knowledge. Some models require the transponder within the key to be programmed in order to function with the immobiliser systems of the car. lexus key programming G28CarKeys use different methods to program these chips. This is accomplished by using a special device which transmits a specific code to the chip to unlock the doors or start the engine. Certain Lexus vehicles are equipped with a unit that combines the key head and the remote. They are much easier to replace, as there is no separate chip required. This type of key is also cheaper. No matter what type of key regardless of the type of key, all fobs eventually run out of battery power. It can be frustrating but with a little know-how you can get your Lexus back in operation. The first step is to consult the owner's manual to identify the type of battery you need and locate the replacement. Find small holes in the inside of the fob. insert the coin (a 20p piece is ideal) and twist. The fob should be revealed as a flat spot that you can use a paper clip to take away. Then, take out the battery that was used and replace it with the new one. Make sure you insert the battery using the proper direction of operation. Clip the inside of the fob together, then insert the key made of metal. Transponder Chips Nearly all new cars built since 1995 have transponder chips within the head of the key to disable the immobiliser system. If you've got keys that has a chip inside it, the head comes with a cover which can be pulled off to reveal an L-shaped metal key. A transponder-chip replacement keys or fob is a process that involves multiple stages. It involves cutting the keys precisely and programming the chip to sync up with the vehicle immobiliser. Transponders are electronic chip equipped with Non-Volatile memory (NVM) that has a set of windings (very fine wire wrapped around the tube) that look like the ones in an electric motor. These windings create a coded message that the car will read. If the code is correct, then the car will allow you to start it. There are two types of transponder chips, one known as the 80 bit, and the other known as a circle + (General Motors). The former type is reusable but it needs to be unlocked by a specific machine in order to function in a compatible vehicle. The latter is a bit more difficult because the previous keys are usually broken and drilled or discarded after key cases are replaced. They are able to be salvaged however and used with a service key that doesn't require a battery in order to operate. Immobiliser Systems Immobiliser systems are electronic security devices which prevent thieves from starting your car. It operates by sending a signal from the vehicle to the key when you attempt to start it. The electronic chip in the key responds with a unique code that must match the one in the vehicle to start. If the codes do not match, the engine will shut down immediately, preventing theft of your vehicle. Modern smart keys and fobs come with an embedded transponder which stores electronic security information in a format which can't be copied easily. When your key or fob is placed in the ignition, it transmits the code to a receiver within the ECU. The ECU examines the code against the one it has stored in its memory, and activates both the fuel system as well as the ignition circuit if they are compatible. If the codes do not match, the engine will not start even if the ignition circuit is short-circuited by a thief. The replacement of the fob or key requires an entire process that involves cutting the new blade with precision and programming it to ensure that it can be synced with your car's systems. There are many different immobilisers that are available in various models and years and each one requires the use of a unique programming method. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly to ensure maximum performance and security.