Lexus Key Replacement - Replacing a Remote Or Fob

Whether you have a conventional Lexus key that is used to turn on the ignition or a smart key for your car that activates by pressing one button, eventually the battery in your key will go out. It's simple to replace it using the use of a paperclip. Simply remove the old battery, replace it with the new battery (refer to the owner's manual to determine the type of battery that you require) and then clip it back in the correct position.

Keys

Lexus keys are not simple to replace and require a professional car key replacement locksmith to create a spare working. This is because every Lexus key is equipped with an electronic chip that needs to be programmed to synchronise with the immobiliser of your vehicle in case it does not. If it doesn't, the vehicle will not be able to start.

It takes a lot of time and specialized equipment to allow this process to be carried out correctly. Each model has its own procedure for programming. Replacing a key or remote fob is a costly job and should be left to professionals unless you possess the proper tools and knowledge.

If you have a traditional key that turns in the ignition barrel, or an electronic key that starts the car at the push of a button, both will eventually need their batteries replaced. It's easy to do it yourself however you'll need a small Phillips Screwdriver, a 20p coin and paperclip. There are one or two screws on the back of the fob for the key. Unscrew them, and store them securely (they are small and easy to lose). Take the fob off, revealing a circular indentation where the key's metal part will be. Take the battery out with the paperclip, and then insert the new battery, making sure that it is inserted correctly. Then, clip the outside of the key back to the fob.

Remotes

Replacing a Lexus remote or fob can be complicated and requires skilled locksmiths with the right tools and expertise. Some models require the transponder within the key to be changed to allow it to communicate with the immobiliser system of the car. The Lexus models use different methods to program these chips. This is accomplished by using a special device which transmits a specific code to the chip to unlock the doors or to start the engine.

Some Lexus cars are designed with a key head that is a combination of the key head and the remote. They are easy to replace, since there is no separate chip to replace. This kind of key could also be a little cheaper.

Whatever the type of key no matter what type of key it is, all fobs eventually run out of battery power. This could be a difficult experience, but it's possible to get your lost lexus key back on track with a little bit of knowledge. First, check the owner's guide to determine the kind of battery you need and then locate an alternative. Locate a small hole on the inside of the fob. Insert the coin (20p is a good choice) into the hole and then twist. The fob should be revealed as an unflattened area that you can use a paper clip to remove.

Then, remove the battery that was used and replace it with the new one. Make sure that the new battery is inserted in the proper direction of operation. Finally, you can clip the inside of the fob back and reconnect the key to the metal.

Transponder Chips

Transponder chips can be found in head of the key on almost all new cars manufactured since 1995. They can be used to disarm immobiliser systems. The head of a key that is equipped with a transponder chip may be removed to reveal a metal L-shaped key. A replacement key or fob made of transponder chips is a multi-stage procedure that includes precise cutting of key replacements and programming the transponder chip in order to synch up with the vehicle's immobiliser system.

A transponder is an electronic chip equipped with Non-Volatile memory (NVM) that houses a set of windings (very fine wire that is wrapped around a tube) that resemble ones found in an electric motor. The windings generate a coded message that the car is able to read. If the code is correct, then the car will allow you to start it.

There are two types of transponder chips. One known as the 80 bit and the other known as a circle + (General Motors). The first one is reusable, however it needs to be unlocked with a special machine to function on a different vehicle compatible with it. The latter type is more difficult, as the older ones are often broken, drilled through or thrown away when key cases are replaced. They can be salvaged however and then used to create an ad-hoc key that does not require a battery to function.

Immobiliser Systems

Immobiliser systems are electronic security devices that deter thieves from starting your car. It works by sending a signal from your vehicle to the key when you attempt to start it. The electronic chip inside the key responds by transmitting a unique code that must match the one of the vehicle to allow it to start. If the codes don't match, your engine will stop immediately and prevent theft of your vehicle.

Modern smart keys and fobs are equipped with embedded transponder chips that stores security information in a format that cannot be easily duplicated. When the key or fob are inserted into the ignition, they send this code to the ECU. The ECU is able to compare this code with the one stored in its memory and activates both the fuel system and the ignition circuit if they match. If the codes don't match then the engine will not start even if the ignition circuit is short-circuited by a thief.

The replacement of the fob or key requires an entire process that involves cutting the new blade precisely and programming it to ensure that it can be synced with your car's system. There are many different immobiliser systems used in different years and models and each needs its own unique programming procedure. We employ Ross-Tech to ensure that the replacement key is programmed correctly. This will provide you with maximum performance and security.