Lexus Key Replacement - Replacing a Remote Or Fob
The battery inside the key fob will eventually wear out, whether you have the standard Lexus Key that turns the ignition, or an intelligent key for your car that starts by pressing a button. The replacement process is simple with a paperclip. Simply pop the old battery out and then insert the new one (refer to the owner's guide to determine which battery you require) and then secure it back in the correct position.
Keys
Lexus keys can be difficult to replace. A specialist locksmith is required to design a spare that works. Each Lexus key has a microchip which must be programmed in order to communicate with the immobiliser system in your vehicle.
It requires a lot of time and special equipment for this process to be done correctly. Each model comes with its own set of programming procedures. Replacing a remote or key fob is a costly job and one you should leave to experts unless you have the right tools and know-how.
You will have to replace the batteries in your smart key or conventional key. Both keys work by turning the barrel of the ignition. This can be done yourself, but you will need an inexpensive Phillips Screwdriver, 20p coins and paperclip. On the back of the fob you will see either one or two screws remove them and place them somewhere safe (they're tiny and easy to lose). Take the fob off to reveal an indentation of circular shape for the key made of metal. Pop the battery out (using the paperclip) and then put in the new one ensuring it's the correct way up. Then, clip the inside of the key back to the fob.
Remotes
Replacing a Lexus remote or fob can be difficult and requires expert locksmiths with both the right tools as well as knowledge. Some models require that the transponder chip in the key be reprogrammed to function with the immobiliser system of the car. These chips are programmed using different methods depending on the model of Lexus. This is done by making use of a special device that sends a code to the chip to unlock the doors or start the engine.
Certain Lexus cars are designed with a key head that is a combination of the key head and remote. They are much easier to replace, since there is no separate chip needed. This kind of key may also be a bit cheaper.
Whatever the type of key, all fobs eventually run out of battery power. This can be a frustrating experience, but it is possible to get your Lexus back up and running with a little knowledge. Read the owner's guide to determine which battery type you require. Find a replacement. Locate a small hole on the inside of your fob. Insert an amount of money (20p works well) into the hole and twist. This should reveal an unflattened area that you can make use of a paper clip to remove.
Then, pull the old battery off and insert the new one. Make sure to insert the battery with the proper polarity. Finally, clip the inside of the fob back and reconnect the key to the metal.
Transponder Chips
Transponder chips are found in the key heads of almost all new vehicles manufactured after 1995. They are used to disarm immobiliser systems. If you've got a key with a chip, the head comes with a cover which can be pulled off to reveal an L-shaped key. A transponder chip replacement key or fob is a multistage process. lexus key replacement involves cutting the keys precisely and programming the chip to make it sync with the vehicle's immobiliser.
Transponders are electronic chip equipped with Non-Volatile memory (NVM) that has a set of windings (very fine wire wrapped around a tube) which look similar to ones in an electric motor. These windings form a coded signal that the car can read. If the code is correct the car will begin to move.
There are two types of transponder chips. One is known as the 80 bit, and the other is known as a circle + (General Motors). The former can be reused but needs to be unlocked by a specific machine in order to work in another compatible vehicle. The latter one is more difficult, as the older keys are usually damaged, drilled through or thrown away when key cases are replaced. However, they can be used with a service-key which does not require a battery.
Immobiliser Systems
An immobiliser is a digital security device which prevents thieves from opening 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 that must match that of the vehicle in order for it to start. If the codes don't coincide, your engine will shut off immediately to prevent theft.
Modern smart keys and fobs feature an embedded transponder chip that stores security information in a format that can't be duplicated. When the key or fob are placed in the ignition, they transmit this code to the ECU. The ECU is able to compare this code with the one stored in its memory, and it activates the fuel system and the ignition circuit if they are compatible. If the codes do not match then the engine will not start even in the event that the ignition circuit is short-circuited by a thief.
Replacing a fob or key is a multi-stage process that involves accurate cutting of the new key blade and programming it to work with the immobiliser system of your vehicle. There are a variety of immobiliser systems that are used in different years and models and each needs an individual programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly for optimal performance and security.