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Lexus Key Replacement – Replacing a Remote Or Fob If you own a traditional Lexus key that turns in the ignition or a smart key for your car that starts with the press of one button, eventually the battery in your fob will run out. Replacing it is as simple as a paperclip. Simply pop the old battery out and then insert the new one (refer to your owner's manual to determine which battery you require) and then secure it back into place. Keys Lexus keys aren't easy to replace and require a professional locksmith to replace your car key to create a working spare. Every Lexus key is equipped with a microchip that needs to be programmed in order to work with the immobiliser system in your vehicle. This process takes time and requires special equipment to perform correctly, and every model has a distinct procedure for programming. Replacing a lost or damaged key or fob is a cost-effective service and one you should leave to professionals unless you possess the proper tools and knowledge. Whether you have a conventional key that turns in the ignition barrel, or a smart key that will start the car at the touch of a button, both will eventually need their batteries replaced. This can be done by yourself but you'll need the smallest Phillips Screwdriver, 20p coin and a paperclip. There are one or two screws on the back of the fob for the key. Unscrew them and store them safely (they are small and easy to lose). Remove the fob and you will see an indentation with a circular shape that houses the key made of metal. Pop the battery out (using the paperclip) and insert the new one, making sure it's facing the right way up. Clip the the key to secure it. Remotes Lexus remotes and fobs aren't easy to replace and require locksmiths who are skilled and possess the appropriate tools. Some models require the transponder within the key to be programmed to allow it to communicate with the immobiliser system in the car. These chips are programmed using different methods based on the model of Lexus. This is done using a specific device that transmits a code to the chip to unlock the doors or to start the engine. Some Lexus cars are constructed with a single unit that includes the key head and remote. They are more simple to replace since no separate chip is required. This type of key is also a bit cheaper. No matter what type of key any fob eventually runs out of battery power. It can be very frustrating however with a little bit of knowledge you can get your Lexus up and running. Read the owner's guide to determine the type of battery you require. Then, locate a replacement. Find a small opening on the inside of the fob. Insert an amount of money (20p works well) into the hole and then twist. This should reveal a flat area that you can utilize a paperclip to take away. Then, take out the battery that was used and replace it with the new one. Be sure the replacement battery is installed with the correct polarity. Finally, clip the inside of the fob back to its original position and insert the key back into the metal. Transponder Chips Transponder chips can be found in key heads of a majority of new cars manufactured since 1995. They can be used to disable immobiliser systems. If you've got keys with a chip inside, the head is covered with a plastic cover that can be pulled off to reveal an L-shaped key. Making a replacement key, or fob made with a transponder chip is a multi-stage process that involves precise cutting of replacement keys and programming of the transponder chip in order to synch up with the vehicle's immobiliser system. A transponder is a device that has Non-Volatile Memory. It is comprised of a set of windings, which are very fine wires coiled around a tube. They look similar to those in an electric motor. These windings transmit a message that the car read. If lexus key fob is correct, then the car will allow you to start it up. There are two types of transponder chip. The first is called the 80-bit while the other is known as the circle + (General Motors). The former type is reusable however it must be unlocked by a specific machine in order to function in a different compatible vehicle. The latter is a bit more difficult since the earlier keys are usually damaged and then drilled through or discarded when key cases are replaced. They are able to be salvaged however for use with an ad-hoc key that doesn't require batteries to function. 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 car to the key whenever you attempt to start it. The chip inside your key responds with a unique code which must match the one found in the vehicle in order to start. If the codes do not match, the engine will stop immediately and stop the theft of your vehicle. Modern smart keys and fobs feature an embedded transponder chip that stores electronic security in a format that cannot be easily duplicated. When the fob or key are inserted into the ignition, they send this code to the ECU. The ECU will then check it against the code in its memory. It then activates the ignition system and fuel circuit if they match. If the codes do not match, your engine won't be able to start – even if an armed robber attempts to short-circuit the ignition circuit. The replacement of keys or fobs involves a multi-stage procedure that includes cutting the new key blade with precision and programming it so that it is compatible with your car's system. There are many different immobiliser systems used in different models and years and each has an individual programming procedure. We utilize Ross-Tech to ensure that the replacement key is correctly programmed. This will provide you with maximum performance and security.