Lexus Key Replacement - Replacing a Remote Or Fob

If you own a traditional lexus car key copy key that turns on the ignition or a smart key for your car that activates with the push of a button, eventually the battery in the fob will deplete. It is easy to replace it with the use of a paperclip. Simply remove the old battery, insert the new one (refer to the owner's manual to determine the type of battery that you need), then clip it back into the appropriate spot.

Keys

Lexus keys aren't simple to replace and require a specialist locksmith for car keys to create a working spare. Each lexus key shell key comes with a microchip which must be programmed to sync with the immobiliser system in your vehicle.

This process takes time and special equipment to execute right, and each model has its own procedure for programming. Replacing a key or remote fob can be a costly task and one you should leave to professionals unless you have the appropriate tools and experience.

You will need to replace the batteries in your smart key or standard key. Both keys function by turning the barrel of the ignition. You can save money by doing this yourself, but it will require only a small Phillips screwdriver and an old coin (a 20p piece works best) and a 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). Remove the fob and you will see an indentation with a circular shape that houses the metal key, pop the battery out (using the paperclip) and insert the new one ensuring that it's pointing the right way up. Then, clip the inside of the key back to the fob.

Remotes

Replacing a Lexus remote or fob can be an extremely complex process that requires skilled locksmiths equipped with the right tools and knowledge. Some models require the transponder on the key to be changed so that it can work with the immobiliser systems of the car. The Lexus models use different methods to program these chips. This is accomplished by using a specific device that transmits a code to the chip to unlock the doors or start the engine.

Some Lexus cars are designed with a device that combines the key head and remote. They are much easier to replace, since there is no chip that needs to be replaced. This kind of key may also be a bit cheaper.

All fobs eventually lose battery power, regardless of the type of key. This can be a very frustrating situation, but it's possible to get your Lexus back in operation with a little bit of knowledge. The first step is to consult the owner's manual to identify the type of battery you need and find the replacement. Then, locate an opening inside of the fob. Then, insert coins (a 20p piece is ideal) and twist. You will see an open area which you can easily remove using a paperclip.

Then, pull the old battery off and insert the new one. Be sure to insert the battery with the proper polarity. Finally, you can clip the inside of the fob back and insert the key back into the metal.

Transponder Chips

Most new cars built since 1995 have transponder chips in the head of the key to disable the immobiliser system. The head of a key that is equipped with a transponder chip may be removed to reveal a steel L-shaped key. Making a replacement lexus key key, or fob made of transponder chips is a multi-stage method that includes precise cutting of replacement keys as well as programming the transponder chip so that it can synch up with the vehicle's immobiliser system.

A transponder is a type of chip with Non-Volatile Memory. It has a set of windings, which are fine wires that are wrapped around a tube. They look like those in an electric motor. The windings are coded to create a signal that the car can read. If the code is correct then the car will allow you to start it up.

There are two kinds of transponder chip, one called the 80 bit and the other is known as a circle + (General Motors). The first kind is reusable, however it needs to be delocked using a specific machine in order to work on another compatible vehicle. The latter is more difficult, as the older keys are often damaged, drilled through or discarded when key cases are replaced. They are able to be salvaged however and then used to create an ad-hoc key that doesn't require a battery in order to operate.

Immobiliser Systems

Immobiliser systems are electronic security measures that deter thieves from starting up your vehicle. It operates by sending an electronic signal from the car to the key every time you attempt to start it. The electronic chip inside the key responds with an unique code that must match the one in the vehicle in order to start. If the codes don't match, the engine will shut down immediately, preventing theft of your vehicle.

Modern smart keys and fobs come with embedded transponder chips that stores security information in a format that cannot be easily duplicated. When your key or fob is installed in the ignition it transmits the code to a receiver inside the ECU. The ECU compares this code with the one it has stored in its memory, and it activates both the fuel system and the ignition circuit if they match. If the codes do not match, the engine won't start - even if a thief tries to short-circuit the ignition circuit.

The replacement of keys or fobs involves an entire process that involves cutting the new blade accurately and programming it to ensure that it is compatible with your car's system. Each immobiliser system is unique and has its own programming procedure. We use Ross-Tech software to ensure that your replacement key is programmed correctly to ensure the best performance and security.