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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 that begins with the push of one button, eventually the battery in your fob will run out. It is simple to replace it using 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 require) and then secure it back in the appropriate spot. Keys Lexus keys can be difficult to replace. A specialist locksmith is needed to make an original replacement that works. This is because every Lexus key is equipped with an embedded microchip that must be programmed to synchronise with the immobiliser system of your vehicle – if not it will not be able to start. It takes a lot of time and equipment that is specially designed for this process to be carried out correctly. Each model has its own programming procedure. Replacing remotes or keys is a cost-effective service that you should leave to professionals unless you are equipped with the proper tools and know-how. You will have to replace the batteries in your smart key or conventional key. Both keys operate by turning the barrel of the ignition. You can save money by doing this yourself, but it requires the use of a small Phillips screwdriver as well as an old coin (a 20p piece is a good choice) and a paperclip. You will find one or two screws on the back of the key fob. Remove them and keep them safe (they are small and easy to lose). Take the fob off, revealing an indentation of a circular shape where the key's metal surface will be. The battery can be removed by using a paperclip. Then, insert the new battery, making sure that it's inserted correctly. Clip the inside of the key to secure it. Remotes Replacing the Lexus remote or fob can be an extremely complex process that requires skilled locksmiths equipped with the right tools and experience. Some models require the transponder on the key to be programmed in order to function with the immobiliser systems of the car. The chips are programmed with different methods, based on the model of Lexus. 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 automobiles are built with a single piece of hardware that consists of the key head and the remote. These are simpler to replace as no separate chip is required. This kind of key could also be a bit cheaper. Whatever the type of key any fob eventually runs out of battery power. This can be a very frustrating situation, but it's possible to get your Lexus back to normal with a little bit of knowledge. The first step is to consult the owner's manual for the type of battery you need and then locate an alternative. Find small holes in the inside of the fob and insert an item of currency (a 20p piece is ideal) and twist. This should reveal a flat spot that you can use a paper clip to remove. Next, pop the old battery out and insert the new one. Make sure that you insert the battery in the correct the polarity. Clip the two sides of your fob and insert the metal key. Transponder Chips Transponder chips are present in the key heads of a majority of new cars built since 1995. They can be used to disable immobiliser systems. The head of a key that contains a transponder chip is able to be removed to reveal an L-shaped key. A transponder-chip replacement keys or fob is a multi-stage procedure. It involves cutting the keys accurately and programming the chip to sync up with the vehicle immobiliser. A transponder is an electronic chip equipped with Non-Volatile memory (NVM) that contains a set of windings (very fine wire twisted around tubes) which look similar to ones found in an electric motor. These windings transmit a message that the car will read. If the code is correct, then the car will allow you to start it. There are two types of transponder chips. The one is known as the 80-bit while the other is known as the circle + (General Motors). The former type is reusable but it needs to be unlocked with a special device to work in another compatible vehicle. locksmith lexus keys is more difficult, as the older keys are usually broken and then drilled through or discarded when key cases are replaced. They are able to be salvaged however for use with a service key that doesn't require a battery in order to operate. Immobiliser Systems An immobiliser is an electronic security measure which prevents thieves from opening your car. It works by sending a signal from your car to the key when you attempt to start it. The electronic chip in the key responds by sending a unique code that must match that of the vehicle in order for it to start. If the codes don't match, your engine will shut down immediately, and stop theft of your car. Modern smart keys and fobs have an embedded transponder that can store electronic security information in a format that can't be copied easily. When the fob or key are inserted into the ignition, they send this code to the ECU. The ECU analyzes this code in comparison to the one it has stored in its memory and activates both the fuel system as well as the ignition circuit if they match. If the codes do not match, your engine won't start – even if someone tries to short-circuit the ignition circuit. Replacing a fob or a key is a multi-stage process that involves accurate cutting of the new blade for the key and programming it to communicate with your car's immobiliser system. There are a variety of immobilisers used in different years and models and each one requires the use of a unique programming method. We use Ross-Tech to ensure that the replacement key is programmed correctly. This will give you maximum performance and security.