Lexus Key Replacement - Replacing a Remote Or Fob
The battery inside your key fob will eventually wear out, whether you own an ordinary Lexus Key that turns on the ignition, or an intelligent key for your car that starts by pressing a button. It's easy to replace it with using a paperclip. Pop the old battery out and insert the new one (refer to the owner's manual to determine the type of battery you require) and then clip it back into place.
Keys
Lexus keys aren't simple to replace and require a professional car key replacement locksmith to make a working spare. This is because every Lexus key is equipped with an electronic chip that needs to be programmed to sync with your vehicle's immobiliser - if not it will not be able to start.
The process takes time and requires special equipment to perform right, and each model has its own programming procedure. Replacing remotes or keys is a costly service that should be left to experts, unless equipped with the right tools and expertise.
It doesn't matter if you have a standard key that rotates in the ignition barrel, or a smart key that will start the car with the click of an arrow they will both eventually need their batteries replaced. You can save money by doing this yourself, but you'll need the use of a small Phillips screwdriver as well as a coin (a 20p piece is a good choice) and a paperclip. On the back of the fob you will see either one or two screws take them off and place them in a safe location (they're small and can be lost). Remove the fob, revealing an indentation that is circular where the key's metal part will be. Pop the battery out using the paperclip and insert the new battery, making sure that it's properly inserted. Then, clip the outside of the key back together.
Remotes
Lexus remotes and fobs aren't easy to replace and require locksmiths who are skilled and possess the appropriate tools. Certain models require the transponder on the key to be reprogrammed in order to function with the immobiliser system of the car. The Lexus models employ different methods to program these chips. This is accomplished by using an electronic device that transmits an electrical signal to the chip that matches the code used to unlock the doors and start the engine.
Certain Lexus automobiles are built with a single unit that consists of the key head and remote, and these are easier to replace since no separate chip is required. This type of key can also be a little less expensive.
Regardless of the key type any fob eventually runs out of battery power. It can be very frustrating, but with a little know-how you can get your Lexus up and running again. First, consult the owner's guide to determine the kind of battery you need and then locate the replacement. Find lexus keys opening inside of the fob. insert a coin (a 20p piece works well) and twist. You should see an open area that you can take out with the help of a paperclip.
Then, remove the battery that was used and replace it with the new one. Be sure to insert the battery using the proper direction of operation. Finally, cut the inside of the fob back together and reconnect the key to the metal.
Transponder Chips
Nearly all new cars since 1995 have transponder chips within the head of the key to disable the immobiliser system. If you have a key with a chip, the head is covered in a plastic cover that is able to be pulled off to reveal an L-shaped key. A transponder-chip replacement keys or fob is a multi-stage procedure. It involves cutting the keys accurately and programming the chip to sync up with the vehicle immobiliser.
A transponder is an electronic chip that has Non-Volatile Memory (NVM) that houses a set of windings (very fine wire that is wrapped 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 correct then the car will allow you to start it.
There are two types of transponder chips, one called the 80 bit and the other is known as a circle + (General Motors). The former can be reused however it must be unlocked by a specific machine in order to function in a different compatible vehicle. The latter is more difficult since the earlier keys are usually damaged and then drilled through or thrown away when key cases are replaced. However they can be used with a key-service that does not require batteries.
Immobiliser Systems
An immobiliser is a digital security device which prevents thieves from opening your car. It works by sending a signal from your car to the key when you attempt to start it. The electronic chip inside the key responds with a unique code that must match that of the vehicle in order to start. If the codes don't match, the engine will immediately shut down to prevent theft.
Modern smart keys and fobs are equipped with an embedded transponder that stores electronic security information in a format which cannot be easily copied. When your fob or key is installed in the ignition it transmits the code to a receiver inside the ECU. The ECU analyzes this code in comparison to the one stored in its memory, and then activates the fuel system and the ignition circuit if they are compatible. If the codes do not match, the engine will not start even when the ignition circuit is damaged by a thief.
Replacing a fob or key is a multi-stage process that requires precise cutting of the new key blade and programming it to synch with your car's immobiliser system. Each immobiliser system is distinct and has its own unique programming procedure. We employ Ross-Tech to ensure that the replacement key is programmed correctly. This will ensure the highest level of performance and security.