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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, which starts with the push of a button, eventually the battery in the fob will deplete. The replacement process is simple with a paperclip: Take the old battery out, insert the new one (refer to the owner's guide to determine the type of battery you require), and clip it back in the correct position.
Keys
Lexus keys are not simple to replace and require a specialist locksmith for car keys to make a functioning spare. This is due to the fact that every Lexus key has microchips that need to be programmed in order to synchronise with your vehicle's immobiliser system If it is not, the car will not start.
This process takes time and special equipment to do right, and each model has its own method of programming. Replacing a key or remote fob is a costly job and should be left to professionals unless your have the proper tools and knowledge.
No matter if you're using a conventional key that rotates in the ignition barrel, or a smart key that can start your car at the click of one button either way, they will need their batteries replaced. You can save money by doing it yourself, but it requires only a small Phillips screwdriver and coins (a 20p piece is a good choice) and a paperclip. There are one or two screws on the back of the fob for the key. Unscrew them and then store them in a safe place (they are small and easy to lose). Remove the fob and you will see a circular indentation for the key made of metal. Pop the battery out (using the paperclip) and replace it with the new battery, making sure it is the right way up. Clip the the key back to.
Remotes
Lexus remotes and fobs aren't easy to replace and require locksmiths who are both skilled and possess the appropriate tools. Certain models require the transponder within the key to be changed to work with the immobiliser systems of the car. These chips are programmed using different methods depending on the model of Lexus. This is done using an electronic device that transmits an electronic signal to the chip which matches the code used to open the doors and start the engine.
Some Lexus cars are designed with a single unit that consists of the key head and remote. These are much easier to replace because no separate chip is required. This kind of key may also be a little cheaper.
Regardless of the key type no matter what type of key it is, all fobs eventually run out of battery power. It can be quite frustrating but with a little know-how you can get your Lexus back to normal. 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 coins (a 20p piece is a good choice) and twist. You should see a flat area that you can get rid of using the help of a paperclip.
Then, pull the old battery away and then insert the new one. Make sure that the new battery is inserted in the proper polarity. Clip the two sides of your fob together and insert the key in the metal.
replace lexus key  manufactured after 1995 have transponder chips in the key head to disable the immobiliser system. If you've got a key with a chip, the head is covered in a plastic cover that is able to be pulled off to reveal an L-shaped metal key. A transponder-chip replacement keys or fob is a multi-stage process. It involves cutting the keys with precision and programming the chip to sync up with the vehicle immobiliser.
A transponder is an electronic chip with Non-Volatile Memory (NVM) that contains a set of windings (very fine wire twisted around the tube) that resemble ones in an electric motor. These windings create a coded 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 chip. The first is called the 80-bit while the other is known as the circle + (General Motors). The former can be reused however it must be unlocked by a specific machine in order to work in another compatible vehicle. The second kind is more difficult to use because the older ones could be damaged, broken or thrown out when key cases are changed. They can be salvaged, however and then used to create a service key that doesn't need a battery to operate.
Immobiliser Systems
Immobiliser systems are electronic security devices that stop thieves from starting up your car. It works by sending an electronic signal from the vehicle to the key every time you try to start it. The electronic chip inside the key responds by sending a unique code that must match the one of the vehicle to allow it to start. If the codes do not match, the engine will stop immediately, preventing theft of your car.
Modern smart keys and fobs come with embedded transponder chips that stores security information in a format that can't be duplicated. When the fob or key is inserted into the ignition, they transmit this code to the ECU. The ECU then compares it with the code in its memory, and activates the ignition system and fuel circuit if they match. If the codes don't match and the engine does not start, even if the ignition circuit is short-circuited by a thief.
Replacing a fob or a key is a multi-stage procedure which involves precise cutting the new key blade, and programming it to work with the immobiliser system of your vehicle. Each immobiliser is unique and has its own programming procedure. We employ Ross-Tech to ensure that the replacement key is programmed correctly. This will provide you with maximum performance and security.