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Lexus Key Replacement – Replacing a Remote Or Fob No matter if you have a standard Lexus key that turns on the ignition or a smart key for your car that activates by pressing an arrow, eventually the battery in the fob will deplete. It's easy to replace it with a paperclip. Simply take out the old battery, then insert the new one (refer to the owner's manual for the type of battery that you need), then clip it back in its place. Keys Lexus keys are not simple to replace and require a specialist locksmith for car keys to create a working spare. This is because every Lexus key contains microchips that need to be programmed to sync with your vehicle's immobiliser system If it is not, the car will not be able to start. It takes a lot of time and specialized equipment to allow this procedure to be completed correctly. Each model has its own procedure for programming. Replacing a lost or damaged key or fob can be a costly task and should be left to experts unless you have the proper tools and knowledge. You'll need to replace the batteries in your smart key or standard key. Both keys work by turning the barrel of the ignition. It's easy to do it yourself however you'll need the smallest Phillips Screwdriver, a coin worth 20p and a paperclip. There are two or three screws on the back of the fob of the key. Remove them and store them safely (they are small and easy to lose). Remove the fob, revealing a circular indentation where the key's metal surface will be. Pop the battery out using the paperclip and insert the new battery, ensuring that it's inserted correctly. Then, clip the inside of the key back together. Remotes Replacing the Lexus remote or fob is complicated and requires skilled locksmiths with the right tools and knowledge. Some models require the transponder in the key to be changed in order to function with the immobiliser system in the car. The Lexus models employ different methods to program these chips. This is done using a special device which transmits a specific code to the chip to unlock the doors or to start the engine. Certain Lexus vehicles are equipped with a device that combines the key head and the remote. They are simpler to replace because there is no separate chip to replace. This kind of key could also be a bit cheaper. All fobs eventually lose their battery power, no matter the kind of key. This could be a difficult experience, but it is possible to get your Lexus back to normal with a little know-how. Check out the owner's manual to determine which battery type you require. 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 a flat surface that you can get rid of using an ordinary paperclip. Then, pull the old battery out and replace the new one. Be sure the replacement battery is inserted in the correct direction of operation. Clip the inside of your fob together and insert the key metal. Transponder Chips Nearly all new cars since 1995 have transponder chips embedded in the key head to disable the immobiliser system. The head of a key which has a transponder chip can be removed to reveal a metal L-shaped key. A replacement key or fob made with a transponder chip is a multi-stage method that involves precise cutting of key replacements and programming the transponder chip so that it can synch up with the vehicle's immobiliser. A transponder is a chip with Non-Volatile Memory. It contains a set windings which are fine wires wrapped around a tube. They look like the ones in an electric motor. The windings create a coded signal for the car to read. If the code is correct then the car will allow you to start it. There are two types of transponder chips, the first is called the 80-bit, while the second is called the circle + (General Motors). The first is reusable but needs to be unlocked by a machine that is specially designed to be used in a compatible vehicle. The second one is more difficult to use because the older ones could be broken, drilled, or removed when key cases are changed. However, they can be utilized with a service key that doesn't require a battery. Immobiliser Systems Immobiliser systems are electronic security measures which prevent thieves from starting your car. It operates by sending an electronic signal from the car to the key whenever you try to start it. The electronic chip inside the key responds by sending a unique code which must match the one of the vehicle to allow it to start. If replacement lexus key don't match, your engine will stop immediately and prevent theft of your car. Modern smart keys and fobs are equipped with embedded transponder chips that stores security information in a format that cannot be duplicated. When the fob or key is inserted into the ignition, they transmit this code to the ECU. The ECU analyzes this code in comparison to the one it has stored in its memory, and then activates both the fuel system as well as the ignition circuit if they match. If the codes do not match, the engine won't be able to start – even if someone tries to short-circuit the ignition circuit. The process of replacing the fob or key involves a multi-stage process that includes cutting the new key blade with precision and programming it so that it syncs with your car's systems. Each immobiliser system is unique and has its own programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly for optimal performance and security.