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Lexus Key Replacement – Replacing a Remote Or Fob If you have a traditional Lexus key that turns in the ignition or a smart key for your car, which starts with the push of one button, eventually the battery in your key will go out. Replacing it is as simple as using a paperclip. Pop the existing battery out, insert the new one (refer to the manual for your owner to see which type of battery you need) and then secure it back in the correct position. Keys Lexus keys aren't easy to replace. A professional locksmith is needed to make an original replacement that works. This is because every Lexus key has an electronic chip that needs to be programmed to sync with your vehicle's immobiliser system in case it does not. If it doesn't, the vehicle will not be able to start. It takes a lot time and equipment that is specially designed for this process to be carried out correctly. Each model comes with its own set of programming procedures. Replacing keys or remotes is a pricey task that should be left to experts, unless equipped with the proper tools and knowledge. If you have a traditional key that turns in the ignition barrel, or a smart key that will start the car with the click of an arrow, both will eventually need their batteries replaced. It's easy to do it yourself, but you will need the smallest Phillips Screwdriver, a coin worth 20p and a paperclip. There are two or three screws on the back of the key fob. Unscrew them and store them safely (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 replace it with the new battery, making sure it's facing the right way up. Clip the inside of the key back together. Remotes Replacing the Lexus remote or fob is complicated and requires skilled locksmiths equipped with the right tools and expertise. Some models require that the chip inside the key be changed in order to work with the immobiliser system of the car. The chips are programmed using different methods depending on the model of Lexus. This is accomplished by making use of a special device that sends a code to the chip to unlock the doors or to start the engine. Some Lexus cars are designed with a key head that is a combination of the key head and the remote. They are simpler to replace, since there is no separate chip required. This kind of key is also cheaper. All fobs eventually lose battery power, no matter the type of key. This can be a very frustrating experience, but it is possible to get your Lexus back in operation with a bit of know-how. Read the owner's guide to determine which type of battery you require. Then, search for an alternative. Then, locate small holes in the inside of the fob and insert a coin (a 20p piece is ideal) and twist. This should reveal the flat spot, which you can make use of a paper clip to remove. Then, pull the old battery off and insert the new one. Make sure that you insert the battery with the proper direction of operation. Finally, clip the inside of the fob back together and replace the key with the metal. Transponder Chips Transponder chips are present in the key heads of a majority of new cars built since 1995. They can be used to disarm immobiliser systems. If you've got a car key with a chip inside, the head comes with a cover that can be taken off to reveal an L-shaped key. A transponder chip replacement key or fob is a multi-stage process. It involves cutting the keys accurately and programming the chip to connect with the vehicle's immobiliser. A transponder is a type of chip with Non-Volatile Memory. It has a set windings, which are fine wires that are wrapped around a tube. They look like the ones in an electric motor. These windings create a coded message that the car can read. If the code is correct it will allow the car to start. There are two kinds of transponder chips. The one is known as the 80-bit and the other is known as the circle + (General Motors). The first kind is reusable, but must be removed using a special machine in order to work in a different vehicle that is compatible. The second type is more difficult to use because the older keys could be broken, drilled or removed when key cases are changed. They are able to be salvaged however, to use with an ad-hoc key that does not require a battery to function. Immobiliser Systems Immobiliser systems are electronic security measures which prevent thieves from starting your car. It works by sending an electronic signal from your car to the key every time you attempt to start it. The chip inside the key responds with a unique code that must match the one found in the vehicle in order to start. If the codes don't coincide, your engine will shut down immediately to stop theft. Modern smart keys and fobs contain an embedded transponder that can store electronic security information in a format that cannot be easily copied. When key for lexus or key are placed in the ignition, they send this code to the ECU. The ECU then compares it to the code in its memory and activates the ignition system and fuel circuit if they match. If the codes don't match, the engine will not start, even if someone tries to short-circuit the ignition circuit. The process of replacing the fob or key involves an entire process that involves cutting the new blade accurately and programming it so that it can be synced with your car's systems. Each immobiliser system is unique and has its own programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly to ensure maximum performance and security.