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Lexus Key Replacement – Replacing a Remote Or Fob Whether you have a conventional Lexus key that switches on the ignition or a smart key for your car that activates by pressing a button, in time the battery in your fob will run out. It is simple to replace it with the use of a paperclip. Simply take out the old battery, insert the new one (refer to the owner's manual for the type of battery you need), then clip it back into its place. Keys Lexus keys aren't easy to replace and require a professional locksmith to replace your car key to make a working spare. This is due to the fact that every Lexus key is equipped with a microchip that needs to be programmed to work in conjunction with your vehicle's immobiliser and if it's not, it'll not start. This process takes time and requires special equipment to perform right, and each model has its own unique programing procedure. Replacing remotes or keys is a pricey task that you should leave to professionals unless you are equipped with the proper equipment and know-how. Whether you have a conventional key that turns on the ignition barrel or an electronic key that starts the car at the touch of an arrow, both will eventually need their batteries replaced. It's a simple task to do but you'll need an inexpensive Phillips Screwdriver, a 20p coin and a paperclip. On lost lexus key fob of the fob you will see either one or two screws remove them and place them in a secure place (they're tiny and easy to lose). Remove the fob and you will see a circular indentation for the key made from metal, take the battery out (using the paperclip) and insert the new one, making sure it's facing the right way up. Clip the the metal key back together. Remotes Lexus remotes and fobs aren't easy to replace and require locksmiths who are experienced and possess the proper tools. Some models require the transponder inside the key to be reprogrammed to work with the immobiliser systems of the car. The Lexus models use different methods to program these chips. This is done using an instrument that sends an indication to the chip which matches the code used to open the doors and start the engine. Certain Lexus models are built with a system that combines the key head and remote. These are easier to replace since there is no chip that needs to be replaced. This type of key can also be a little less expensive. Regardless of the key type regardless of the type of key, all fobs eventually run out of battery power. This can be a frustrating experience, but it's possible to get your Lexus back to normal with a little knowledge. Check out the owner's manual to determine which type of battery you need. Then, search for a replacement. Then, locate a small hole in the inside of the fob. Then, insert the coin (a 20p piece works well) and twist. You should be able to see a flat surface that you can remove with an ordinary paperclip. Then, take out the old battery and replace it with the new one. Make sure to insert the battery with the correct direction of operation. Finally, 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 within the key head that allow it to deactivate the immobiliser system. If you have a key with a chip inside, the head is covered in a plastic cover that is able to be pulled off to reveal an L-shaped key. Having a replacement key or fob with a transponder chip is a multi-stage process which involves precise cutting of replacement keys and programming the transponder chip to link up with the vehicle's immobiliser. Transponders are electronic chip that has Non-Volatile Memory (NVM) that has a set of windings (very fine wire wrapped around the tube) which look similar to ones found in an electric motor. These windings generate a signal that the car can read. If the code is correct the car will start. There are two types of transponder chips. The first is called the 80-bit while the other is called the circle + (General Motors). The first kind is reusable, however it needs to be removed using a special machine to function on a different vehicle compatible with it. The second is more difficult to use as the older keys could be broken, drilled or taken away when key cases are changed. However, they can be used with a service-key that doesn't require a battery. Immobiliser Systems An immobiliser system is a digital security device that deters 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 shut down immediately, and stop theft of your vehicle. Modern smart keys and fobs have embedded transponder chips that stores security information in a format that cannot be duplicated. When your fob or key is placed in the ignition, it transmits the code to a receiver in the ECU. The ECU then compares it to the code in its memory and activates the fuel system and ignition circuit if the two match. If the codes don't match the engine won't start, even when the ignition circuit has been damaged by a thief. Replacing a lost or damaged key is a multi-stage process which involves precise cutting the new key blade, and programming it to synch with your car's immobiliser system. There are many different immobilisers used in different years and models and each one requires the use of a unique programming method. We utilize Ross-Tech to ensure that the replacement key is correctly programmed. This will ensure the highest performance and security.