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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 the standard Lexus Key that operates the ignition on or an intelligent key for your vehicle, which starts by pressing a button. It's easy to replace it using an ordinary paperclip. Simply take out the old battery, then insert the new battery (refer to the owner's manual for the type of battery you require) and then secure it back into place. Keys Lexus keys are not simple to replace and require a specialist locksmith for car keys to create a working spare. Each Lexus key is equipped with a microchip which must be programmed in order to work with the immobiliser system of your vehicle. This process takes time and specialized equipment to complete right, and each model has a different programing procedure. Replacing remotes or keys is a costly service that should be left to professionals, unless equipped with the right equipment and know-how. You'll have to replace the batteries in your smart or conventional key. Both keys operate by turning the barrel of the ignition. You can save money by doing it yourself but it will require a small Phillips screwdriver as well as a coin (a 20p piece works well) and a paperclip. You will find one or two screws on the back of the fob that holds the key. Remove them and keep them safe (they are small and easy to lose). Take the fob off to reveal a circular indentation for the key made from metal, take the battery out (using the paperclip) and insert the new one ensuring it's the correct way up. Then clip the inside of the key back to the fob. Remotes Replacing the Lexus remote or fob can be an extremely complex process that requires skilled locksmiths equipped with the right tools as well as knowledge. Certain models require the transponder on the key to be changed to allow it to communicate with the immobiliser systems of the car. The Lexus models employ different methods to program these chips. This is done using a special device that sends a code to the chip to unlock the doors or to start the engine. Certain Lexus vehicles are designed with a key head that is a combination of the key head and the remote. These are easier to replace, since there is no chip that needs to be replaced. This kind of key could also be a bit cheaper. No matter what type of key, all fobs eventually run out of battery power. It can be frustrating however with a little bit of knowledge you can get your Lexus up and running again. Refer to the owner's manual to determine what type of battery you need. Then, find a replacement. Find tiny holes on the inside of the fob. insert the coin (a 20p piece works best) and twist. There should be a flat area that you can take out with an ordinary paperclip. Then, take the old battery out and replace the new one. Make sure you insert the battery in the proper polarity. Finally, you can clip the inside of the fob back together and insert the key back into the metal. Transponder Chips Nearly all new cars built since 1995 have transponder chips in the key head to disable the immobiliser system. If you've got a car key that has a chip inside 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 of a transponder chip is a multi-stage method that includes precise cutting of the replacement keys as well as programming the transponder chip in order to synch up with the vehicle's immobiliser. Transponders are electronic chip that has Non-Volatile Memory (NVM) that houses a set of windings (very fine wire twisted around tubes) which look similar to ones found in an electric motor. The windings generate a coded message that the car 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 known as the circle + (General Motors). The first type is reusable, but it must be unlocked using a special machine in order to work on a vehicle that is compatible with the. The latter is more difficult since the earlier keys are often damaged or drilled through, or thrown away when key cases are replaced. They are able to be salvaged however for use with a service key that does not require a battery to function. Immobiliser Systems Immobiliser systems are electronic security measures that deter thieves from starting up your car. It works by sending an electronic signal from the vehicle to your key each time you try to start it. The electronic chip in the key responds with an unique code that must match that of the vehicle to start. If the codes don't match, the engine will shut down immediately, preventing theft of your car. Modern smart keys and fobs have an embedded transponder that can store electronic security information in a format which is not easily copied. When the fob or key are placed in the ignition, they transmit this code to the ECU. The ECU analyzes this code in comparison to the one in its memory, and then activates both the fuel system and the ignition circuit if they are compatible. If the codes don't match, the engine will not start even in the event that the ignition circuit is short-circuited by a burglar. The process of replacing keys or fobs involves a multi-stage process that includes cutting the new blade precisely and programming it so that it can be synced with the car's system. There are lexus replacement key used in different years and models and each one requires an individual programming procedure. We use Ross-Tech to ensure that the replacement key is correctly programmed. This will provide you with the best performance and security.