Lexus Key Replacement - Replacing a Remote Or Fob

If you have a traditional Lexus key that turns in the ignition, or a smart key for your car that begins with the press of one button, eventually the battery inside your fob will die. It is simple to replace it with 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 in the correct position.

Keys

Lexus keys aren't always easy to replace. A professional locksmith is needed to make an original replacement that works. Each Lexus key has an embedded microchip, which needs to be programmed in order to connect with the immobiliser system in your vehicle.

This procedure takes time and special equipment to do correctly, and each model has its own unique programming procedure. Replacing a key or remote fob is a cost-effective service and one you should leave to professionals unless you possess the appropriate tools and experience.

You'll have to replace the batteries in your smart or conventional key. Both keys operate by turning the barrel of the ignition. You can save money by doing this yourself, but it will require a small Phillips screwdriver, an old coin (a 20p piece works well) and a paperclip. On the front of the fob, you will see two or more screws take them off and place them in a safe place (they're small and can be lost). Remove the fob, revealing an indentation with a circular pattern where the key made of metal will be. Remove the battery using the paperclip and insert the new battery, making sure that it's placed correctly. Clip the inside of the key back together.

Remotes

Replacing the Lexus remote or fob is an extremely complex process that requires skilled locksmiths who have the right tools and knowledge. Certain models require that the transponder chip contained in the key be reprogrammed to function with the immobiliser of the car. The chips are programmed with different methods, based on the model of Lexus. This is done using a special device which sends a code chip to unlock the doors or to start the engine.

Some lexus key fob price (these details) models are built with a unit that combines the key head and the remote. These are easier to replace because there is no separate chip needed. This kind of key is also cheaper.

All fobs eventually lose their battery power, no matter the type of key. It can be frustrating however, with a bit of knowledge you can get your Lexus up and running. Refer to the owner's manual to determine what type of battery you need. Then, search for a replacement lexus key. Then, locate tiny holes on the inside of the fob, and insert an item of currency (a 20p piece is a good choice) and twist. This should reveal an unflattened area that you can make use of a paper clip to remove.

Then, remove the old battery and replace it with the new one. Be sure to insert the battery with the proper polarity. Finally, cut the inside of the fob back and replace the key with the metal.

Transponder Chips

More or less all new cars built since 1995 have transponder chips inside the key head to disable the immobiliser system. If you've got a car key that has a chip inside it, the head is covered with a plastic cover which can be pulled off to reveal an L-shaped metal key. A replacement key or fob made of transponder chips is a multi-stage method that includes precise cutting of replacement keys and programming of the transponder chip so that it can synch up with the vehicle's immobiliser system.

A transponder is an electronic chip that has Non-Volatile Memory (NVM) which contains a set of windings (very fine wire coiled around tubes) that resemble ones found in an electric motor. The windings are coded to create a signal that the car can read. If the code is valid, then the car will allow you to start it up.

There are two types of transponder chips, one known as the 80 bit and the other referred to as a circle + (General Motors). The first one is reusable, but must be removed using a special machine in order to work on a different vehicle compatible with it. The latter is a bit more difficult because the previous keys are often damaged or drilled through, or discarded after key cases are replaced. However they can be used with a service-key which doesn't require a battery.

Immobiliser Systems

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

Modern smart keys and fobs feature embedded transponder chips that stores security information in a format that cannot be duplicated. When the fob or key are inserted in the ignition, they transmit this code to the ECU. The ECU will then check it against the code in its memory and activates the ignition and fuel system circuit if they coincide. If the codes do not match, the engine will not start - even if someone tries to short-circuit the ignition circuit.

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