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Lexus Key Replacement - Replacing a Remote Or Fob

Whether you have a conventional Lexus key that turns in the ignition or a smart key for your car that begins with the push of a button, in time the battery in your fob will run out. The replacement process is simple with using a paperclip. Pop the existing battery out and then insert the new one (refer to the owner's guide to see which type of battery you need) and then clip it back in place.

Keys

Lexus keys aren't easy to replace. A specialist locksmith is required to design a spare that works. Each Lexus key comes with a microchip which must be programmed in order 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 programing procedure. Replacing keys or remotes is a costly task that should be left to professionals, unless equipped with the right equipment and know-how.

No matter if you're using a conventional key that turns on the ignition barrel, or a smart key that can start the car at the push of the button Both will eventually require their batteries replaced. This can be done yourself however, you'll require a small Phillips Screwdriver, a coin worth 20p and paperclip. On the back of the fob you will see either two or more screws remove them and place them in a safe place (they're tiny and easy to lose). The fob can be removed to reveal an indentation of circular shape for the key made from metal, take the battery out (using the paperclip) and then put in the new one ensuring it is the right way up. Clip the inside of the key back together.

Remotes

Lexus remotes and fobs can be difficult to replace and require locksmiths who are skilled and possess the appropriate tools. Certain models require the transponder on the key to be changed in order to function with the immobiliser of the vehicle. These chips are programmed by different methods, based on the model of lexus key shell. This is accomplished by using a specific device that sends a signal to the chip which matches the code used to open the doors and start the engine.

Some lost lexus key cars are designed with a single unit that consists of the key head and the remote, and these are simpler to replace as no separate chip is required. This type of key is also a bit less expensive.

No matter what type of key any fob eventually runs out of battery power. It can be a frustrating experience, but with a little knowledge you can get your Lexus up and running again. Start by reading the owner's manual to identify the type of battery you need and find the replacement. Find a small hole on the inside of the fob. Insert a coin (20p works well) into the hole and then twist. You should be able to see an open area which you can easily remove using an ordinary paperclip.

Then, remove the battery that was used and replace it with the new one. Be sure to insert the battery with the correct the polarity. Clip the inside of your fob together and insert the metal key.

Transponder Chips

Most new cars built since 1995 have transponder chips in the key head to disable the immobiliser system. If you've got a key with a chip inside, the head is covered in a plastic cover which can be pulled off to reveal an L-shaped metal key. The process of getting a replacement key fob made with transponder chips is a multi-stage method that includes accurate cutting of the replacement keys as well as programming the transponder chip to link up with the vehicle's immobiliser system.

A transponder is an electronic chip that has Non-Volatile Memory (NVM) that houses a set of windings (very fine wire coiled around a tube) which look similar to ones found in an electric motor. These windings create a coded message that the car is able to read. If the code is correct the car will start.

There are two types of transponder chip, the first is called the 80-bit and the other is known as the circle + (General Motors). The first is reusable, but must be delocked using a specific machine in order to work on another compatible vehicle. The second kind is more difficult to use because the old keys can be damaged, drilled or taken away when key cases are changed. They can be salvaged however and then used to create the service key, which does not require a battery to operate.

Immobiliser Systems

An immobiliser is an electronic security feature that deters thieves from starting your vehicle. It works by sending an electronic signal from the vehicle to the key each time you attempt to start it. The electronic chip inside the key responds by sending a unique code that must match that of the vehicle to allow it to start. If the codes don't match, your engine will stop immediately, and stop theft of your vehicle.

Modern smart keys and fobs contain an embedded transponder that stores electronic security information in a format which cannot be easily copied. When the fob or key are inserted into the ignition, they send this code to the ECU. The ECU compares this code with the one stored in its memory, and it activates both the fuel system as well as the ignition circuit if they are compatible. If the codes do not match and the engine does not start, even when the ignition circuit is short-circuited by a thief.

The replacement of the fob or key involves an entire process that involves cutting the new blade with precision and programming it to ensure that it is compatible with your car's system. Every immobiliser system is unique and has its own unique programming procedure. We employ Ross-Tech to ensure that the replacement key is programmed correctly. This will provide you with the highest level of performance and security.