Lexus Key Replacement - Replacing a Remote Or Fob
The battery in your key fob will eventually go out, whether you have the standard Lexus Key that turns on the ignition on or an intelligent one for your vehicle that can start by pressing a button. It's simple to replace it with the help of a paperclip. Simply take out the old battery, then insert the new battery (refer to the owner's manual to determine the type of battery you need) and then clip it back in its place.
Keys
Lexus keys can be difficult to replace. A professional locksmith is needed to make an alternative that functions. This is because each Lexus key contains a microchip that needs to be programmed to work in conjunction with your vehicle's immobiliser If it is not, the car will not start.
It takes a lot of time and specialized equipment to allow this process to be carried out correctly. Each model has its own procedure for programming. Replacing a key or a remote fob can be a costly task and one you should leave to professionals unless you possess the appropriate tools and experience.
Whether you have a conventional key that is turned on in the ignition barrel, or a smart key that can start the car with the click of one button Both will eventually require their batteries replaced. You can save money by doing this yourself, but it will require the use of a small Phillips screwdriver as well as a coin (a 20p piece is ideal) and a paperclip. On the back of the fob you will see either two or three screws take them off and place them in a safe location (they're small and can be lost). Remove lexus spare key to reveal an indentation with a circular shape that houses the metal key, pop the battery out (using the paperclip) and then insert the new one making sure it's facing the right way up. Clip the inside of the key to secure it.
Remotes
Replacing a Lexus remote or fob can be complicated and requires skilled locksmiths who have the right tools and knowledge. Certain models require that the chip inside the key be programmed to function with the immobiliser of the car. The Lexus models use different methods to program these chips. This is accomplished by using a special device which transmits a specific code to the chip to unlock the doors or start the engine.
Certain Lexus vehicles are designed with a unit that combines the key head and remote. These are easier to replace, since there is no separate chip required. This kind of key may also be a bit cheaper.
All fobs eventually lose battery power, regardless of the type of key. It can be very frustrating however, with a little knowledge you can get your Lexus back in operation. Start by reading the owner's manual to determine what type of battery you need and find a replacement. Locate a small hole on the inside of the fob. Insert an amount of money (20p is a good choice) into the hole and twist. You should be able to see a flat 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. Make sure that you insert the battery in the correct direction of operation. Finally, cut the inside of the fob back and re-insert the metal key.
Transponder Chips
Most new cars since 1995 have transponder chips within the head of the key to disable the immobiliser system. If you've got a key with a chip in it the head is covered in a plastic cover that can be taken off to reveal an L-shaped key. A transponder-chip replacement key, also known as a fob is a multistage process. It involves cutting keys precisely and programming the chip to communicate with the vehicle's immobiliser.
A transponder is an electronic chip equipped with Non-Volatile memory (NVM) that has a set of windings (very fine wire wrapped around tubes) that look like the ones found in an electric motor. These windings generate a signal that the car can read. If the code is correct the car will begin to move.
There are two types of transponder chip, one called the 80 bit and the other one is called a circle + (General Motors). The first one can be reused, but has to be unlocked using a special machine to function on another compatible vehicle. The second one is more difficult to use because the old keys can be damaged, broken or removed when key cases are changed. However, they can be used with a service-key that doesn't require a battery.
Immobiliser Systems
An immobiliser is a digital security device that deters thieves from starting your car. It operates by sending a signal from your vehicle to the key when you attempt to start it. The electronic chip inside the key responds by transmitting a unique code that must match that of the vehicle in order for it to start. If the codes aren't compatible, the engine will shut down immediately, preventing theft of your vehicle.
Modern smart keys and fobs have embedded transponder chips that stores electronic security in a format that cannot be duplicated. When the key or fob is inserted into the ignition, they send this code to the ECU. The ECU compares this code with the one that is stored in its memory, and then activates both the fuel system as well as the ignition circuit if they match. If the codes do not match, your engine won't be able to start - even if an armed robber attempts to short-circuit the ignition circuit.
The process of replacing the fob or key requires a multi-stage process that includes cutting the new key blade precisely and programming it so that it syncs with your car's system. There are a variety of immobilisers used in different models and years and each one requires the use of a unique programming method. We use Ross-Tech to ensure that the replacement key is correctly programmed. This will ensure the best performance and security.