Lexus Key Replacement - Replacing a Remote Or Fob
If you own a traditional Lexus key that turns on the ignition, or a smart key for your car that begins with the press of a button, eventually the battery inside your fob will run out. It's easy to replace it with an ordinary paperclip. Simply take out the old battery, insert the new battery (refer to the owner's manual for the type of battery you require), then clip it back in place.
Keys
Lexus keys are not easy to replace and require a professional locksmith to replace your car key to create a working spare. This is because each Lexus key is equipped with an embedded microchip that must be programmed to work in conjunction with your vehicle's immobiliser system and if it's not, it'll not be able to start.
This process requires time and requires special equipment to perform correctly, and every model has its own method of programming. Replacing a key or remote fob is an expensive service and should be left to professionals unless you possess the right tools and know-how.
You will need to replace the batteries in your smart key or standard key. Both keys operate by turning the barrel of the ignition. This can be done by yourself however, you'll require the smallest Phillips Screwdriver, a 20p coin and a paperclip. There are two or three screws on the back of the key fob. Unscrew them, and then store them in a safe place (they are small and easy to lose). Remove the fob, which will reveal an indentation with a circular pattern where the key's metal surface will be. Take the battery out by using a paperclip. Then, insert the new battery, ensuring that it's inserted correctly. Clip the inside of the key to secure it.
Remotes
Replacing a Lexus remote or fob can be a complicated process and requires skilled locksmiths equipped with the right tools and expertise. Certain models require the transponder within the key to be changed so that it can work with the immobiliser systems of the car. The chips are programmed with different methods, based on the model of Lexus. This is done using a specific device that sends an electronic signal to the chip which matches the code used to unlock the doors and start the engine.
lexus key fob replacement are designed with a single piece of hardware that incorporates the key head and the remote, and these are simpler to replace as there is no separate chip. This type of key is also less expensive.
No matter what type of key regardless of the type of key, all fobs eventually run out of battery power. This is a stressful situation, but it's possible to get your Lexus back on track with a bit of know-how. Start by reading the owner's guide to determine the kind of battery you require and then locate a replacement. Then, locate an opening inside of the fob. insert a coin (a 20p piece is ideal) and twist. This should reveal a flat area that you can make use of a paper clip to remove.
Then, remove the old battery and replace it with the new one. Make sure the new battery is in the correct the polarity. Finally, you can clip the inside of the fob back together and insert the key back into the metal.
Transponder Chips
Most new cars since 1995 have transponder chips within the key head that allow it to deactivate the immobiliser system. If you have a key with a chip in it the head comes with a cover that can be pulled off to reveal an L-shaped metal key. Making a replacement key, or fob that is made using transponder chips is a multi-stage method that involves precise cutting of replacement keys as well as programming the transponder chip to link up with the vehicle's immobiliser system.
A transponder is a device with Non-Volatile Memory. It is comprised of a set of windings, which are fine wires coiled around the tube. They look like those in an electric motor. These windings form a coded signal that the car can read. If the code is correct, the car will start.
There are two types of transponder chips, the one is known as the 80-bit while the other is called the circle + (General Motors). The former can be reused but it needs to be unlocked by a special machine to function in a different compatible vehicle. The latter one is more difficult as the old keys are often damaged or drilled through, or discarded when key cases are replaced. They are able to be salvaged however for use with a service key that does not require a battery to operate.
Immobiliser Systems
An immobiliser system is a security measure that uses electronic technology that deters thieves from starting your car. It operates by sending a signal from the vehicle to your key when you attempt to start it. The electronic chip in the key responds by sending a unique code which must match that of the vehicle in order for it to start. If the codes do not coincide, your engine will shut down immediately to prevent theft.
Modern smart keys and fobs are equipped with an embedded transponder that stores electronic security information in a format which cannot be easily copied. When your key or fob is inserted into the ignition, it transmits this code to a receiver inside the ECU. The ECU compares this code with the one that is stored in its memory, and it activates both the fuel system and the ignition circuit if they match. If the codes do not match and the engine does not start even if the ignition circuit is short-circuited by a burglar.
Replacing a key or fob is a multi-stage process that involves accurate cutting of the new blade for the key and programming it to synch with the immobiliser system of your vehicle. There are a variety of immobiliser systems used in different models and years and each has its own unique programming procedure. We use Ross-Tech software to ensure that your replacement key is programmed correctly to ensure the best performance and security.