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10 Unexpected Lexus Car Key Tips
Lexus Key Replacement - Replacing a Remote Or Fob

The battery in your key fob is going to eventually run out, whether you own the standard Lexus Key that switches the ignition on or an intelligent one for your vehicle that starts by pressing a button. Replacing it is easy with a paperclip: Take the old battery out, insert the new one (refer to your owner's manual to determine the type of battery you need) and then secure it back into place.

Keys

Lexus keys aren't easy to replace. A specialist locksmith is required to design an original replacement that works. This is due to the fact that every Lexus key is equipped with a microchip that needs to be programmed in order to synchronise with the immobiliser of your vehicle - if not it will not start.

It requires a lot time and equipment that is specially designed for this process to be done correctly. Each model comes with its own set of programming procedures. Replacing a key or a remote fob is an expensive service and one you should leave to professionals unless you possess the right tools and know-how.

You will need to replace the batteries in your smart key or standard key. Both keys operate by turning the barrel of the ignition. You can save money by doing it yourself, but it will require only a small Phillips screwdriver and an old coin (a 20p piece is a good choice) and a paperclip. You will find one or two screws on the back of the fob that holds the key. Unscrew them and store them safely (they are small and easy to lose). Take the fob off, revealing an indentation of a circular shape where the metal key will be. Pop the battery out with the help of a paperclip. Insert the new battery, ensuring that it is inserted correctly. Clip the inside of the key to secure it.

Remotes

Lexus remotes and fobs aren't easy to replace and require locksmiths who are experienced and possess the proper tools. Some models require the transponder inside the key to be changed so that it can work with the immobiliser system of the car. These chips are programmed by different methods, based on the model of Lexus. This is accomplished using a special device which transmits a code to the chip to unlock the doors or to start the engine.

Some Lexus vehicles are equipped with a device that combines the key head and the remote. lexus key cutting are easy to replace because there is no separate chip needed. This type of key can also be a bit cheaper.

All fobs eventually lose battery power, regardless of the kind of key. It can be quite frustrating, but with a little know-how you can get your Lexus back in operation. Start by reading the owner's manual for the kind of battery you need and then locate a replacement. Then, find small holes in the inside of the fob. Then, insert the coin (a 20p piece works well) and twist. You should see a flat area that you can remove with the help of a paperclip.

Then, pull the old battery out and insert the new one. Make sure the new battery is inserted in the proper orientation. Finally, clip the inside of the fob back together, and reconnect the key to the metal.


Transponder Chips

The majority of new cars manufactured after 1995 have transponder chips within the key head that allow it to deactivate the immobiliser system. The head of a key that is equipped with a transponder chip may be removed to reveal a metallic L-shaped key. The process of getting a replacement key fob made of a transponder chip is a multi-stage process which includes precise cutting of replacement keys and programming the transponder chip to synch up with the vehicle's immobiliser.

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

There are two kinds of transponder chips, one called the 80 bit and the other one is called a circle + (General Motors). The first kind can be reused, but has to be removed using a special machine to function in a different vehicle that is compatible. The second is more difficult to use as the old ones can be damaged, drilled or removed when key cases are changed. They are able to be salvaged however and then used to create a service key that does not require a battery to function.

Immobiliser Systems

Immobiliser systems are electronic security measures which prevent thieves from starting your vehicle. It operates by sending a signal from the vehicle to the key when you attempt to start it. The electronic chip in the key responds by sending a unique number of codes that must match that of the vehicle to allow it to start. If the codes don't coincide, your engine will stop immediately to prevent theft.

Modern smart keys and fobs are equipped with an embedded transponder chip that stores electronic security in a format that cannot be duplicated. When the key or fob are inserted in the ignition, they send this code to the ECU. The ECU analyzes this code in comparison to the one that is stored in its memory, and it activates the fuel system and the ignition circuit if they are compatible. If the codes don't match, the engine won't be able to start - even if an armed robber attempts to short-circuit the ignition circuit.

Replacing a lost or damaged key is a multi-stage process which involves precise cutting the new blade for the key and programming it to work with the immobiliser system of your vehicle. There are many different immobilisers used in different years and models and each needs the use of a unique programming method. We use Ross-Tech to ensure that the replacement key is programmed correctly. This will provide you with maximum performance and security.

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