Lexus Key Replacement - Replacing a Remote Or Fob
The battery inside the key fob will eventually wear out, whether you have an ordinary Lexus Key that operates the ignition on or an intelligent one for your vehicle, which starts by pressing the button. The replacement process is simple with using a paperclip. Pop the battery that is in use, insert the new one (refer to your owner's manual to see which type of battery you need) and then clip it back into place.
Keys
Lexus keys aren't always easy to replace. A specialist locksmith is required to design an appropriate replacement that functions. Each Lexus key is equipped with a microchip that needs to be programmed to connect with the immobiliser system in your vehicle.
This process takes time and requires special equipment to perform correctly, and every model has a different method of programming. Replacing a lost or damaged key or fob is a cost-effective service and should be left to professionals unless you have the appropriate tools and experience.
No matter if you're using a conventional key that turns on the ignition barrel, or an electronic key that starts the car at the touch of the button, both will eventually need their batteries replaced. You can save money by doing it yourself, but it will require only a small Phillips screwdriver as well as the coin (a 20p piece is ideal) and a paperclip. You will find two or three screws on the back of the fob that holds the key. Remove them and keep them safe (they are small and easy to lose). Take the fob off to reveal a circular indentation for the key made from metal, take the battery out (using the paperclip) and then put in the new one, making sure it is the right way up. Clip the inside of the key to secure it.
Remotes
Lexus remotes and fobs aren't easy to replace and require locksmiths who are both knowledgeable and have the right tools. Certain models require that the transponder chip within the key be programmed in order to work with the vehicle's immobiliser system. The chips are programmed using different methods depending on the model of Lexus. This is done using an instrument that sends an electrical signal to the chip that matches the code used to open the doors and start the engine.
Some Lexus cars are designed with a unit that combines the key head and the remote. They are simpler to replace, as there is no separate chip needed. This kind of key could also be a bit cheaper.
All fobs eventually lose battery power, no matter the kind of key. This is a stressful experience, but it is possible to get your Lexus back on track with a little bit of knowledge. The first step is to consult the owner's guide to determine the kind of battery you need and then locate the replacement. Then, locate tiny holes on the inside of the fob. insert the coin (a 20p piece works well) and twist. additional reading should see an open area that you can take out with a paperclip.
Then, remove the battery that was used and replace it with the new one. Be sure the replacement battery is installed with the correct direction of operation. Finally, cut the inside of the fob back and replace the key with the metal.
Transponder Chips
Transponder chips can be found in key heads of almost all new cars produced since 1995. They are used to disable immobiliser systems. If you have a key with a chip in it the head is covered in a plastic cover which can be pulled off to reveal an L-shaped metal key. A replacement key or fob that is made using transponder chips is a multi-stage procedure that includes accurate cutting of the replacement keys as well as programming the transponder chip to link up with the vehicle's immobiliser.
A transponder is an electronic device with Non-Volatile Memory (NVM) that houses a set of windings (very fine wire that is wrapped around tubes) which look similar to ones in an electric motor. These windings transmit a message that the car read. If the code is correct then the car will allow you to start it up.
There are two kinds of transponder chips. One known as the 80 bit and the other known as a circle + (General Motors). The first is reusable, but must be delocked using a specific machine to function on another compatible vehicle. The latter one is more difficult as the old keys are often damaged and drilled or discarded after key cases are replaced. They can be salvaged however and then used to create a service key that doesn't require batteries to operate.
Immobiliser Systems
An immobiliser is an electronic security feature that deters thieves from starting your vehicle. It operates by sending an electronic signal from the vehicle to the key whenever you try to start it. The electronic chip inside the key responds by sending a unique code which must match that of the vehicle to allow it 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 are equipped with an embedded transponder chip that stores electronic security in a format that can't be easily duplicated. When your key or fob is installed in the ignition it transmits this code to a device within the ECU. The ECU is able to compare this code with the one in its memory, and it activates both the fuel system and the ignition circuit if they match. If the codes do not match then the engine will not start even when the ignition circuit is cut off by a criminal.
Replacing a key or fob is a multi-stage process that involves precise cutting of the new blade of the key and programming it to communicate with the immobiliser system of your vehicle. Every 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.