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Why Lexus Car Key Isn't As Easy As You Imagine
Lexus Key Replacement - Replacing a Remote Or Fob

Whether you have a conventional Lexus key that turns on the ignition, or a smart key for your car that activates with the press of an arrow, eventually the battery in the fob will deplete. The replacement process is simple with a paperclip: Take the battery that is in use and insert the new one (refer to the owner's manual to determine which battery you need), and clip it back in the correct position.

Keys

Lexus keys aren't easy to replace and require a professional car key replacement locksmith to make a functioning spare. Each Lexus key is equipped with an embedded microchip that must be programmed to work with the immobiliser system in your vehicle.

This process requires time and specialized equipment to complete properly, and each model has its own programing procedure. Replacing a key or remote fob is a costly job and should be left to experts unless you have the appropriate tools and expertise.

You'll have to replace the batteries in your smart key or traditional key. Both keys operate by turning the barrel of the ignition. This can be done yourself, but you will need an inexpensive Phillips Screwdriver, 20p coins and a paperclip. You will find two or three screws on the back of the fob that holds the key. Unscrew them and store them securely (they are small and easy to lose). lexus car keys replacement can be removed to reveal a circular indentation for the key made from metal, take the battery out (using the paperclip) and insert the new one ensuring it's facing the right way up. Then, clip the inside of the key back together.

Remotes

Replacing a Lexus remote or fob is an extremely complex process that requires skilled locksmiths with the right tools as well as knowledge. Some models require the transponder on the key to be programmed to work with the immobiliser of the vehicle. The chips are programmed with different methods based on the model of Lexus. This is accomplished using a specific device that transmits a code to the chip to unlock the doors or to start the engine.

Certain Lexus cars are designed with a unit that combines the key head and remote. They are simpler to replace, as there is no separate chip to replace. This type of key is also a bit less expensive.

Regardless of the key type, all fobs eventually run out of battery power. This could be a difficult situation, but it's possible to get your Lexus back on track with a little knowledge. Consult the owner's guide to determine the type of battery you need. Then, locate the replacement. Find a small hole on the inside of your fob. Insert an amount of money (20p is a good choice) into the hole and then twist. You should be able to see a flat area that you can take out with an ordinary paperclip.

Then, take out the old battery and replace it with the new one. Make sure the new battery is inserted in the correct orientation. Finally, cut the inside of the fob back to its original position and insert the key back into the metal.

Transponder Chips

Nearly all new cars since 1995 have transponder chips embedded in the key head that allow it to deactivate the immobiliser system. If you have a key with a chip, the head has a plastic cover that is able to be pulled off to reveal an L-shaped key. A replacement key or fob that is made using transponder chips is a multi-stage procedure that involves precise cutting of replacement keys and programming of the transponder chip so that it can synch up with the vehicle's immobiliser.

A transponder is a type of chip that has Non-Volatile Memory. It has a set windings, which are very delicate wires that are twisted around a tube. They resemble the ones in an electric motor. These windings transmit a message that the car is able to read. If the code is correct it will allow the car to start.

There are two kinds of transponder chip, the first is called the 80-bit and the other is known as the circle + (General Motors). The first one is reusable, but must be unlocked with a special machine to function on a different vehicle compatible with it. The second is more difficult to use due to the fact that the older keys could be damaged, broken or thrown out when key cases are changed. However, they can be used with a key-service that does not require batteries.

Immobiliser Systems

An immobiliser system is an electronic security feature that stops thieves from starting your car. It operates by sending an electronic signal from your car to the key each time you attempt to start it. The electronic chip in 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, the engine will shut off immediately to prevent theft.

Modern smart keys and fobs come with an embedded transponder that stores electronic security information in a format that cannot be easily copied. When the key or fob are inserted in the ignition, they send this code to the ECU. The ECU examines the code against the one it has stored in its memory, and activates both 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 someone tries to short-circuit the ignition circuit.

The replacement of the fob or key requires multiple steps that include cutting the new key blade accurately and programming it so that it can be synced with your car's system. There are many different immobiliser systems that are used in different models and years 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 ensure the highest level of performance and security.