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Lexus Key Replacement – Replacing a Remote Or Fob No matter if you have a standard Lexus key that is used to turn on the ignition, or a smart key for your car, which starts with the press of a button, in time the battery inside your fob will run out. It's easy to replace it with using a paperclip. Pop the battery that is in use and replace it with the new one (refer to the owner's manual to determine which kind of battery you require) and then clip it back into the correct position. Keys Lexus keys are not simple to replace and require a professional locksmith for car keys to create a working spare. This is due to the fact that every Lexus key has an embedded microchip that must be programmed to synchronise with your vehicle's immobiliser system in case it does not. If it doesn't, the vehicle will not be able to start. It takes a lot time and special equipment for this process to be done correctly. Each model has its own programming procedure. Replacing remotes or keys is a costly service that should be left to professionals, unless equipped with the right tools and knowledge. You will have to replace the batteries in your smart key or conventional key. Both keys operate by turning the barrel of the ignition. This can be done yourself however you'll need an inexpensive Phillips Screwdriver, a coin worth 20p and a paperclip. On the back of the fob you will see either two or more screws take them off and place them in a safe location (they're tiny and easy to lose). The fob is removed, revealing an indentation of a circular shape where the key made of metal will be. Pop the battery out using the paperclip and insert the new battery, making sure that it's properly inserted. Clip the inside of the metal key back together. Remotes Lexus remotes and fobs aren't easy to replace and require locksmiths who are both well-versed and have the proper tools. Some models require that the chip inside the key be reprogrammed in order to work with the car's immobiliser system. The Lexus models employ different methods to program these chips. This is done by using a specific device that sends an electronic signal to the chip that matches the code used to open the doors and start the engine. Certain Lexus cars are constructed with a single piece of hardware which includes the key head as well as the remote, and these are much easier to replace because there is no separate chip. This kind of key could also be a little less expensive. Whatever the type of key regardless of the type of key, all fobs eventually run out of battery power. This could be a difficult situation, but it's possible to get your Lexus back on track with a little know-how. Check out the owner's manual to determine which type of battery you require. Then, locate the replacement. Find a small hole on the inside of your fob. Insert the coin (20p is a good choice) into the hole and then twist. You should be able to see a flat area that you can take out with the help of a paperclip. Then, remove the battery that was used and replace it with the new one. Be sure to insert the battery with the correct direction of operation. Finally, clip the inside of the fob back together, and insert the key back into the metal. Transponder Chips Transponder chips are found in the head of the key on almost all new vehicles manufactured after 1995. They are used to disable immobiliser systems. The head of a key that is equipped with a transponder chip may be removed to reveal a metal L-shaped key. Making a replacement key, or fob made of a transponder chip is a multi-stage process which includes accurate cutting of the replacement keys and programming of the transponder chip in order to synch up with the vehicle's immobiliser. A transponder is a type of chip with Non-Volatile Memory. It has a set windings that are fine wires wrapped around the tube. They look like the ones in an electric motor. These windings transmit a message that the car is able to read. If the code is correct it will allow the car to start. There are two kinds of transponder chips. One known as the 80 bit and the other referred to as a circle + (General Motors). The former is reusable but must be delocked with a special device to be used in a compatible vehicle. The latter is more difficult because the previous keys are usually damaged and then drilled through or discarded when key cases are replaced. However they can be used with a key-service that doesn't require a battery. Immobiliser Systems An immobiliser system is an electronic security measure that prevents thieves from starting your vehicle. It works by sending an electronic signal from the vehicle to the key whenever you try to start it. The electronic chip inside your key responds by sending a unique code that must match that in the vehicle in order to start. If the codes don't match, the engine will stop immediately, preventing theft of your vehicle. Modern smart keys and fobs are equipped with an embedded transponder, which stores electronic security information in a format that can't be copied easily. When the fob or key is inserted into the ignition, they transmit this code to the ECU. The ECU examines the code against the one that is stored in its memory, and then activates the fuel system and the ignition circuit if they are compatible. If the codes do not match, the engine will not start, even in the event that the ignition circuit is short-circuited by a thief. G28 Car Keys of the fob or key involves an entire process that involves cutting the new blade accurately and programming it to ensure that it syncs with your car's systems. Each immobiliser is unique and has its own programming procedure. We employ Ross-Tech to ensure that the replacement key is correctly programmed. This will give you the best performance and security.