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Lexus Key Replacement – Replacing a Remote Or Fob Whether you have a conventional Lexus key that is used to turn on the ignition or a smart key for your car that activates with the press of a button, in time the battery in your fob will run out. The replacement process is simple with a paperclip: Take the old battery out and replace it with the new one (refer to the owner's manual to determine which battery you need) and then secure it back in place. Keys Lexus keys aren't always easy to replace. A specialist locksmith is required to design an appropriate replacement that functions. This is because each Lexus key contains microchips that need to be programmed in order to synchronise with your vehicle's immobiliser – if not it will not be able to start. It takes a lot time and equipment that is specially designed for this process to be carried out correctly. Each model comes with its own set of programming procedures. Replacing keys or remotes is a costly service that you should leave to experts, unless equipped with the right tools and know-how. If you have a traditional key that rotates in the ignition barrel or a smart key that can start the car at the push of the button they will both eventually need their batteries replaced. This can be done yourself, but you will need an inexpensive Phillips Screwdriver, a coin worth 20p and a paperclip. You will find two or three screws on the back of the fob of the key. Remove them and keep them safe (they are small and easy to lose). Take the fob off, revealing an indentation that is circular where the key's metal part will be. Remove the battery using the paperclip and insert the new battery, making sure that it is inserted correctly. Clip the inside of the metal key back together. Remotes Replacing the Lexus remote or fob can be complicated and requires expert locksmiths with both the right tools as well as knowledge. Some models require the transponder in the key to be programmed in order to function with the immobiliser system in the car. These chips are programmed using different methods depending on the model of Lexus. This is done with a specific device that sends a signal to the chip which matches the code used to open the doors and start the engine. Some Lexus automobiles are built with a single unit which includes the key head and remote. replacement lexus keys www.thekeylab.co.uk are much easier to replace because there is no separate chip. This type of key is also a bit cheaper. All fobs eventually lose their battery power, no matter the kind of key. It can be very frustrating, but with a little bit of knowledge you can get your Lexus back to normal. Read the owner's guide to determine which type of battery you need. Then, find a replacement. Locate a small hole on the inside of your fob. Insert the coin (20p is a good choice) into the hole and twist. You should see an area flat that you can get rid of using the help of a paperclip. Then, pull the old battery out and insert the new one. Make sure that the new battery is inserted with the proper orientation. Clip the inside of your fob together and insert the key made of metal. Transponder Chips Most new cars manufactured after 1995 have 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. A transponder-chip replacement key or fob is a multi-stage procedure. It involves cutting the keys accurately and programming the chip to connect with the vehicle's immobiliser. A transponder is a chip that has Non-Volatile Memory. It has a set of windings, which are fine wires coiled around the tube. They look like the ones in an electric motor. The windings create a coded signal that the car can read. If the code is correct it will allow the car to start. There are two kinds of transponder chip, one known as the 80 bit and the other is known as a circle + (General Motors). The former type is reusable but needs to be unlocked by a specific machine in order to function in a compatible vehicle. The second type is more difficult to use due to the fact that the old keys can be damaged, drilled or removed when key cases are changed. They are able to be salvaged however and then used to create an ad-hoc key that doesn't require a battery in order to operate. Immobiliser Systems An immobiliser is an electronic security feature which prevents thieves from opening your car. It works by sending an electronic signal from the car to your key each time you try to start it. The chip inside your key then responds with a unique code that must match the one in the vehicle to start. If the codes don't match, the engine will immediately shut down to prevent theft. Modern smart keys and fobs have an embedded transponder chip that stores electronic security in a format that cannot be duplicated. When the key or fob are inserted into the ignition, they send this code to the ECU. The ECU examines the code against the one in its memory, and then activates both the fuel system as well as the ignition circuit if they match. If the codes don't match, your engine won't start – even if someone tries to short-circuit the ignition circuit. Replacing a lost or damaged key is a multi-stage procedure which involves precise cutting the new key blade and programming it to connect with the immobiliser system of your vehicle. There are many different immobiliser systems used in different years and models and each has an individual programming procedure. We use Ross-Tech to ensure that the replacement key is correctly programmed. This will ensure the highest level of performance and security.