Lexus Key Replacement - Replacing a Remote Or Fob
If you have a traditional Lexus key that is used to turn on the ignition or a smart key for your car that activates by pressing a button, eventually the battery inside your fob will run out. It's easy to replace it with a paperclip. Simply remove the battery that was in use, and then insert the new one (refer to the owner's manual for the type of battery you need) and then secure it back into its place.
Keys
Lexus keys aren't easy to replace and require a specialist locksmith for replacing car keys to create a working spare. This is because each Lexus key has a microchip that needs to be programmed to sync with the immobiliser system of your vehicle If it is not, the car will not be able to start.
This procedure takes time and special equipment to do correctly, and each model has its own unique procedure for programming. Replacing remotes or keys is a costly service that you should leave to professionals unless you are equipped with the proper tools and expertise.
If TheKeyLab have a traditional key that is turned on in the ignition barrel or an electronic key that starts the car at the push of a button they will both eventually need their batteries replaced. You can save money by doing it yourself, but it requires only a small Phillips screwdriver and the coin (a 20p piece is a good choice) 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). The fob can be removed to reveal a circular indentation for the key made of metal. Pop the battery out (using the paperclip) and insert the new battery, making sure it is the right way up. Then, you can clip the inside of the key back to the fob.
Remotes
Replacing a Lexus remote or fob can be a complicated process and requires skilled locksmiths with the right tools as well as knowledge. Some models require the transponder inside the key to be changed to work with the immobiliser system of the car. The Lexus models use different methods to program these chips. This is accomplished by using an electronic device that transmits a signal to the chip that matches the code used to unlock the doors and start the engine.
Some Lexus models are built with a device that combines the key head and remote. They are easy to replace because there is no separate chip required. This kind of key may also be a bit cheaper.
Regardless of the key type regardless of the type of key, all fobs eventually run out of battery power. It can be quite frustrating however, with a little know-how you can get your Lexus back in operation. Read the owner's guide to determine what type of battery you require. Then, search for the replacement. Find a small hole on the inside of the fob. Insert the coin (20p works well) into the hole and twist. You should see an open area that you can get rid of using a paperclip.
Next, pop the old battery away and then insert the new one. Be sure to insert the battery in the correct the polarity. Finally, cut the inside of the fob back to its original position and re-insert the metal key.
Transponder Chips
More or less all new cars manufactured after 1995 have transponder chips embedded in the head of the key to disable the immobiliser system. If you've got a car key that has a chip inside it, the head has a plastic cover that can be taken off to reveal an L-shaped key. A transponder chip replacement key or fob is a process that involves multiple stages. It involves cutting the keys precisely and programming the chip to connect with the vehicle's immobiliser.
A transponder is a device with Non-Volatile Memory. It contains a set windings that are fine wires that are wrapped around the tube. They look like those in an electric motor. The windings create a coded signal that the car can read. If the code is correct then the car will allow you to start it.
There are two kinds of transponder chips, the first is called the 80-bit, while the second is called the circle + (General Motors). The former can be reused but it needs to be unlocked by a special machine to be used in a compatible vehicle. The latter is more difficult because the previous keys are usually damaged or drilled through, or discarded after key cases are replaced. However, they can be used with a service-key that does not require batteries.
Immobiliser Systems
An immobiliser system is an electronic security feature which prevents thieves from opening your vehicle. It works by sending an electronic signal from the car to your key each time you try to start it. The electronic chip in the key responds by transmitting a unique code that must match the one of the vehicle to allow it to start. If the codes do not coincide, your engine will stop immediately to stop theft.
Modern smart keys and fobs are equipped with an embedded transponder that can store electronic security information in a format that can't be copied easily. When the fob or key are inserted into the ignition, they transmit this code to the ECU. The ECU then compares it with the code stored in its memory. It then activates the ignition system and fuel circuit if they coincide. If the codes do not match, the engine won't start - even if a burglar tries to short-circuit the ignition circuit.
The process of replacing the fob or key requires an entire process that involves cutting the new key blade with precision and programming it to ensure that it syncs with your car's system. Each immobiliser system is distinct and has its own programming procedure. We use Ross-Tech software to ensure that your replacement key is programmed correctly to ensure optimal performance and security.