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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 an arrow, eventually the battery in the fob will deplete. It is simple to replace it with the help of a paperclip. Simply remove the old battery, insert the new battery (refer to the owner's manual to determine the type of battery you require) 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 create a spare working. This is because every Lexus key contains a microchip that needs to be programmed in order to synchronise with the immobiliser of your vehicle – if not it will not start. This procedure takes time and requires special equipment to perform right, and each model has a different programming procedure. Replacing a lost or damaged key or fob is a costly job and one you should leave to professionals unless you have the right tools and know-how. Whether you have a conventional key that is turned on in the ignition barrel or a smart key that will start the car at the push of a button they will both eventually need their batteries replaced. It's a simple task to do however you'll need a small Phillips Screwdriver, 20p coin and a paperclip. On the front of the fob, you will see two or three screws remove them and place them in a safe location (they're small and easily lost). Remove the fob to reveal a circular indentation for the key made from metal, take the battery out (using the paperclip) and then insert the new one making sure it is the right way up. Clip the the key back together. Remotes Lexus remotes and fobs aren't easy to replace and require locksmiths who are knowledgeable and have the right tools. Some models require the transponder inside the key to be reprogrammed to allow it to communicate with the immobiliser system in the car. The Lexus models use different methods to program these chips. This is done using a specific device that sends a code to the chip to unlock the doors or to start the engine. Certain Lexus cars are designed with a single piece of hardware that includes the key head as well as the remote, and these are much easier to replace because no separate chip is required. 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 frustrating however, with a bit of knowledge you can get your Lexus up and running again. Read the owner's guide to determine what type of battery you need. Find an alternative. Then, locate small holes in the inside of the fob, and insert coins (a 20p piece is a good choice) and twist. You should see a flat surface that you can get rid of using the help of a paperclip. Then, pull the old battery off and insert the new one. Be sure the replacement battery is installed with the correct polarity. Clip the inside of your fob to insert the key in the metal. Transponder Chips Transponder chips are in the key heads of a majority of new vehicles manufactured after 1995. They are used to disarm immobiliser systems. lexus key fob replacement cost of a key that is equipped with a transponder chip may be removed to reveal a metallic L-shaped key. A transponder-chip replacement key, also known as a fob is a multi-stage process. It involves cutting the keys accurately and programming the chip to communicate with the vehicle's immobiliser. A transponder is a chip with Non-Volatile Memory. It contains a set windings which are delicate wires that are twisted around the tube. They resemble the ones in an electric motor. The windings are coded to create a signal for the car to read. If the code is correct it will allow the car to start. There are two kinds of transponder chips. The first is called the 80-bit while the other is known as the circle + (General Motors). The first type can be reused, but has to be delocked using a specific machine to function on another compatible vehicle. The second one is more difficult to use because the old keys can be broken, drilled or removed when key cases are changed. They can be salvaged, however for use with the service key, which does not require a battery to operate. Immobiliser Systems Immobiliser systems are electronic security measures that deter thieves from starting your vehicle. It operates by sending an electronic signal from the car to the key whenever you try to start it. The chip inside your key then responds with an unique code that must match that of the vehicle to start. If the codes aren't compatible, the engine will shut down immediately and prevent theft of your car. Modern smart keys and fobs are equipped with an embedded transponder that stores electronic security information in a format that can't be copied easily. When your key or fob is placed in the ignition, it transmits the code to a receiver in the ECU. The ECU examines the code against the one it has stored in its memory, and activates both the fuel system and the ignition circuit if they are compatible. If the codes do not match, your engine won't start – even if an armed robber attempts to short-circuit the ignition circuit. The procedure of replacing a key or fob involves multiple steps that include cutting the new key blade with precision and programming it to ensure that it is compatible with your car's system. There are a variety of immobilisers used in different years and models and each has its own distinct programming process. We use Ross-Tech software to ensure that your replacement key is programmed correctly to ensure the best performance and security.