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Lexus Key Replacement - Replacing a Remote Or Fob

If you own a traditional Lexus key that is used to turn on the ignition, or a smart key for your car that starts by pressing one button, eventually the battery inside your fob will run out. It's simple to replace it with the help of a paperclip. Simply take out the old battery, then insert the new one (refer to the owner's manual to determine the type of battery you require), then clip it back into place.

Keys

Lexus keys can be difficult to replace. A specialist locksmith is needed to make an appropriate replacement lexus key that functions. This is because every lexus key cutting key contains microchips that need to be programmed in order to synchronise with your vehicle's immobiliser and if it's not, it'll not be able to start.

It requires a lot of time and equipment that is specially designed for this process to be done correctly. Each model has its own procedure for programming. Replacing a key or remote fob is a cost-effective service and one you should leave to experts unless you have the appropriate tools and expertise.

Whether you have a conventional key that rotates in the ignition barrel, or a smart key that can start the car with the click of the button, both will eventually need their batteries replaced. You can save money by doing this yourself but it will require the use of a small Phillips screwdriver and a coin (a 20p piece works well) and a paperclip. There are two or three screws on the back of the fob that holds the key. Unscrew them, and store them safely (they are small and easy to lose). Remove the fob to reveal an indentation that is circular for the metal key, pop the battery out (using the paperclip) and then insert the new one making sure it's facing the right way up. Then, clip the inside of the key back together.

Remotes

lexus key shell remotes and fobs aren't easy to replace and require locksmiths who are both well-versed and have the proper tools. Certain models require that the chip inside the key be changed in order to work with the vehicle's immobiliser system. The chips are programmed using different methods, based on the model of Lexus car key. This is accomplished by using an instrument that sends an indication to the chip which matches the code used to unlock the doors and start the engine.

Certain lexus key cutting models are built with a unit that combines the key head and remote. These are easier to replace because there is no separate chip to replace. This type of key is also a bit less expensive.

Regardless of the key type any fob eventually runs out of battery power. This could be a difficult situation, but it's possible to get your Lexus back to normal with a bit of know-how. First, consult the owner's manual to identify the type of battery you need and then locate the replacement. Find a small hole on the inside of your fob. Insert the coin (20p works well) into the hole and 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 replacement battery is inserted in the correct direction of operation. Clip the two sides of your fob and insert the key made of metal.

Transponder Chips

The majority of new cars manufactured after 1995 have transponder chips in the head of the key to disable the immobiliser system. The head of a key which includes a transponder chips can be removed to reveal an L-shaped key. A transponder-chip replacement key, also known as a fob is a multi-stage process. It involves cutting the keys with precision and programming the chip to communicate with the vehicle's immobiliser.

A transponder is an electronic device with Non-Volatile Memory (NVM) that contains a set of windings (very fine wire wrapped around a tube) which look similar to ones found in an electric motor. The windings create a coded signal that the car can read. If the code is correct, the car will start.

There are two kinds of transponder chips. One known as the 80 bit, and the other one is called a circle + (General Motors). The first is reusable but needs to be unlocked with a special device to function in a different compatible vehicle. The latter type is more difficult as the old keys are usually broken, drilled through or discarded when key cases are replaced. They are able to be salvaged however, to use with an ad-hoc key that doesn't need a battery to operate.

Immobiliser Systems

An immobiliser is a security measure that uses electronic technology that stops thieves from starting your vehicle. It works by sending a signal from your vehicle to the key when you attempt to start it. The electronic chip in your key responds with a unique code that must match the one in the vehicle in order to start. If the codes don't match, the engine will immediately shut down to stop theft.

Modern smart keys and fobs have an embedded transponder chip that stores security information in a format that can't be duplicated. When your fob or key is installed in the ignition it transmits this code to a device within the ECU. The ECU then compares it to the code stored in its memory, and activates the ignition and fuel system circuit if they match. If the codes don't match, the engine will not start - even if an armed robber attempts to short-circuit the ignition circuit.

The process of replacing keys or fobs involves a multi-stage process that includes cutting the new key blade precisely and programming it to ensure that it is compatible with your car's security system. Each immobiliser is unique and has its own programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly for the best performance and security.