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Lexus Key Replacement – Replacing a Remote Or Fob The battery in the key fob will eventually run out, whether you have an ordinary Lexus Key that operates the ignition or an intelligent key for your car that starts by pressing the button. Replacing it is as simple as a paperclip. Simply pop the old battery out, insert the new one (refer to the owner's guide to determine which battery you require), and clip it back in the correct position. Keys Lexus keys are not easy to replace and require a specialist locksmith for replacing car keys to make a functioning spare. Every Lexus key has a microchip that needs to be programmed in order to connect with the immobiliser system in your vehicle. It takes a lot of time and specialized equipment for this procedure to be executed correctly. Each model has its own programming procedure. Replacing a lost or damaged key or fob is a costly job and should be left to professionals unless you have the appropriate tools and experience. It doesn't matter if you have a standard key that rotates in the ignition barrel, or an electronic key that starts the car with the click of the button they will both eventually need their batteries replaced. You can save money by doing it yourself, but you'll need only a small Phillips screwdriver, an old coin (a 20p piece works well) and a paperclip. On the side of the fob you will see two or three screws remove them and place them in a secure place (they're small and can be lost). Take the fob off, revealing an indentation with a circular pattern where the key's metal surface will be. Remove the battery by using a paperclip. Then, insert the new battery, ensuring that it is inserted correctly. Then, clip the outside of the key back to the fob. Remotes Lexus remotes and fobs can be difficult to replace and require locksmiths who are well-versed and have the proper tools. Some models require the transponder within the key to be changed to work with the immobiliser system in the car. The chips are programmed with different methods based on the model of Lexus. This is accomplished using a special device which sends a code to the chip to unlock the doors or start the engine. Certain Lexus cars are designed with a system that combines the key head and the remote. These are easier to replace since there is no separate chip required. This kind of key is also a bit less expensive. All fobs eventually lose their battery power, regardless of the kind of key. It can be a frustrating experience however, with a bit of knowledge you can get your Lexus back in operation. Read the owner's guide to determine the type of battery you need. Then, locate a replacement. Find a small opening on the inside of the fob. Insert the coin (20p is a good choice) into the hole and twist. You should be able to see an open area that you can get rid of using an ordinary paperclip. Then, pull the old battery out and insert the new one. Be sure to insert the battery with the correct direction of operation. Finally, you can clip the inside of the fob back together and reconnect the key to the metal. Transponder Chips More or less all new cars made since 1995 include transponder chips inside the key head to disable the immobiliser system. If you've got a car key with a chip in it the head comes with a cover which can be pulled off to reveal an L-shaped key. Making a replacement key, or fob made with transponder chips is a multi-stage process that includes accurate cutting of the replacement keys as well as programming the transponder chip to synch up with the vehicle's immobiliser. Transponders are chips that has Non-Volatile Memory. It has a set windings, which are very fine wires that are wrapped around a tube. They resemble the ones in an electric motor. The windings generate a coded message that the car will read. If the code is correct, the car will start. There are two types of transponder chips. The one is known as the 80-bit and the second is called the circle + (General Motors). The former can be reused but it needs to be unlocked by a machine that is specially designed to work in another compatible vehicle. The second is more difficult to use because the old ones can be broken, drilled or thrown out when key cases are changed. They are able to be salvaged however for use with an ad-hoc key that doesn't require batteries to function. Immobiliser Systems Immobiliser systems are electronic security devices that stop thieves from starting your car. It works by sending a signal from your vehicle to the key when you attempt to start it. The electronic chip inside your 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 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 which can't be copied easily. When lexus spare key or fob are inserted into the ignition, they send this code to the ECU. The ECU then compares it with the code that is stored in its memory, and activates the ignition system and fuel circuit if the two coincide. If the codes don't match then the engine will not start even when the ignition circuit is damaged by a thief. Replacing a fob or key is a multi-stage procedure that involves accurate cutting of the new blade of the key and programming it to connect with your car's immobiliser system. Each immobiliser is unique and has its own unique programming procedure. We employ Ross-Tech to ensure that the replacement key is programmed correctly. This will provide you with maximum performance and security.