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Lexus Key Replacement – Replacing a Remote Or Fob The battery in your key fob is going to eventually run out, whether you have the standard Lexus Key that turns on the ignition or an intelligent key for your vehicle that can start by pressing the button. The replacement process is simple with a paperclip. Simply pop the old battery out and insert the new one (refer to the manual for your owner to determine which battery you need) and then secure it back into place. Keys Lexus keys aren't simple to replace and require a specialist locksmith to replace your car key to make a working spare. Each Lexus key is equipped with a microchip that needs to be programmed in order to sync with the immobiliser system of your vehicle. It takes a lot time and specialized equipment for this procedure to be executed correctly. Each model has its own specific programming process. Replacing keys or remotes is a costly service that you should leave to professionals, unless equipped with the right tools and knowledge. You will have to replace the batteries in your smart key or traditional key. Both keys work by turning the barrel of the ignition. You can save money by doing it yourself but it will require only a small Phillips screwdriver as well as coins (a 20p piece is a good choice) and a paperclip. There are two or three screws on the back of the key fob. Unscrew them, and keep them safe (they are small and easy to lose). The fob is removed, revealing an indentation of a circular shape where the key's metal part will be. Remove the battery by using a paperclip. Then, insert the new battery, making sure that it's inserted correctly. Then clip the inside of the key back to the fob. Remotes Lexus remotes and fobs aren't easy to replace and require locksmiths who are both skilled and possess the appropriate tools. Some models require the transponder inside the key to be changed so that it can work with the immobiliser system of the car. The Lexus models employ different methods to program these chips. This is done with a special device that sends an electrical signal to the chip that matches the code used to unlock the doors and start the engine. Some Lexus cars are constructed with a single piece of hardware that consists of the key head as well as the remote. These are simpler to replace as no separate chip is required. This type of key is also less expensive. All fobs eventually lose battery power, no matter the type of key. It can be very frustrating but with a little know-how you can get your Lexus back to normal. Consult the owner's guide to determine the type of battery you need. Then, find a replacement. Find a small opening on the inside of the fob. Insert a coin (20p is a good choice) into the hole and twist. This should reveal a flat spot that you can use a paper clip to take away. Next, pop the old battery away and then insert the new one. Make sure the new battery is inserted with the correct direction of operation. Clip the inside of your fob together and insert the key metal. Transponder Chips Transponder chips are found in the key heads of almost all new vehicles manufactured after 1995. They are used to disable immobiliser systems. The head of a key that contains a transponder chip is able to be removed to reveal an L-shaped key. A transponder-chip replacement key, also known as a fob is a multi-stage process. It involves cutting the keys precisely and programming the chip to sync up with the vehicle's immobiliser. Transponders are chips that has Non-Volatile Memory. It contains a set windings that are fine wires that are wrapped around a tube. They resemble the ones in an electric motor. The windings are coded to create a signal that the car can read. If the code is valid, then the car will allow you to start it. There are two types of transponder chip. The Keylab is called the 80-bit and the other is known as 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 second one is more difficult to use due to the fact that the old ones can be broken, drilled, or removed when key cases are changed. They can be salvaged, however, to use with an ad-hoc key that doesn't require batteries to operate. Immobiliser Systems Immobiliser systems are electronic security devices that stop thieves from starting your vehicle. It operates by sending an electronic signal from the vehicle to the key whenever you try to start it. The electronic chip in 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, your engine will immediately shut down to stop theft. Modern smart keys and fobs have an embedded transponder chip that stores electronic security in a format that cannot be duplicated. When the key or fob are placed in the ignition, they send this code to the ECU. The ECU compares this code with the one it has stored in its memory and activates both the fuel system and the ignition circuit if they match. If the codes do not match, the engine will not start, even when the ignition circuit has been short-circuited by a burglar. Replacing a fob or a key is a multi-stage procedure that requires precise cutting of the new key blade, and programming it to connect with the immobiliser system of your vehicle. There are a variety of immobilisers that are available in various years and models and each needs the use of a unique programming method. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly for optimum performance and maximum security.