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Lexus Key Replacement – Replacing a Remote Or Fob The battery inside the key fob will eventually go out, regardless of whether it's a conventional Lexus Key that operates the ignition on or an intelligent key for your car that starts by pressing a button. The replacement process is simple with a paperclip: Pop the existing battery out and then insert the new one (refer to the owner's manual to see which type of battery you require) and then clip it back into place. Keys Lexus keys are not easy to replace and require a professional locksmith for car keys to make a working spare. Each Lexus key is equipped with a microchip that needs to be programmed to communicate with the immobiliser system in your vehicle. This procedure takes time and special equipment to execute right, and each model has its own programming procedure. Replacing keys or remotes is a costly service that you should leave to professionals, unless you are equipped with the proper tools and know-how. You will need to replace the batteries in your smart key or conventional key. Both keys function by turning the barrel of the ignition. You can save money by doing it yourself but it will require an inexpensive Phillips screwdriver and an old coin (a 20p piece is a good choice) and a paperclip. There are one or two screws on the back of the fob of the key. Unscrew them, and store them safely (they are small and easy to lose). Take the fob off to reveal a circular indentation for the metal key, pop the battery out (using the paperclip) and then put in the new one making sure it's the correct way up. Clip the inside of the key back together. Remotes Replacing the Lexus remote or fob can be complicated and requires skilled locksmiths with the right tools and experience. Some models require the transponder on the key to be changed to work with the immobiliser systems of the car. The Lexus models employ different methods to program these chips. This is done by using a specific device that sends a signal to the chip which matches the code used to unlock the doors and start the engine. Certain Lexus vehicles are designed with a key head that is a combination of the key head and remote. They are much easier to replace, since there is no separate chip needed. 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 frustrating, but with a little know-how you can get your Lexus up and running. Read the owner's guide to determine the type of battery you need. Find the replacement. Then, locate a small hole in the inside of the fob. Then, insert coins (a 20p piece is a good choice) and twist. The fob should be revealed as a flat area that you can utilize a paperclip to take away. Then, take the old battery off and insert the new one. Be sure to insert the battery with the proper orientation. Finally, clip the inside of the fob back together, and re-insert the metal key. Transponder Chips Nearly all new cars made since 1995 include transponder chips inside the key head to disable the immobiliser system. The head of a key which contains a transponder chip is able to be removed to reveal a metal L-shaped key. Having a replacement key or fob that is made using transponder chips is a multi-stage process which includes precise cutting of the replacement keys and programming the transponder chip to link up with the vehicle's immobiliser system. A transponder is an electronic device with Non-Volatile Memory (NVM) that has a set of windings (very fine wire wrapped around tubes) which look similar to ones in an electric motor. These windings transmit a message that the car will read. If the code is correct the car will begin to move. There are two kinds of transponder chip, one called the 80 bit and the other one is called a circle + (General Motors). The former can be reused but it needs to be unlocked by a specific machine in order to be used in a compatible vehicle. The second type is more difficult to use due to the fact that the old keys can be damaged, broken or taken away when key cases are changed. They can be salvaged, however for use with an ad-hoc key that doesn't require a battery in order to function. Immobiliser Systems Immobiliser systems are electronic security devices that stop thieves from starting your car. It works by sending a signal from the car to the key when you attempt to start it. The chip inside 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 aren't compatible, the engine will stop immediately, and stop theft of your car. Modern smart keys and fobs feature embedded transponder chips that stores electronic security in a format that cannot be duplicated. When the key or fob are inserted into the ignition, they transmit this code to the ECU. The ECU is able to compare this code with the one stored in its memory, and then activates both the fuel system and the ignition circuit if they match. If the codes don't match, the engine won't start – even if someone tries to short-circuit the ignition circuit. lexus car key replacement of replacing the fob or key requires multiple steps that include cutting the new key blade with precision and programming it to ensure that it can be synced with the car's system. There are a variety of immobiliser systems used in different years and models, and each requires its own unique programming procedure. We employ Ross-Tech to ensure that the replacement key is programmed correctly. This will give you the highest performance and security.