Lexus Key Replacement - Replacing a Remote Or Fob
The battery in the key fob is going to eventually run out, regardless of whether you have a conventional Lexus Key that switches the ignition on or an intelligent key for your vehicle that starts by pressing the button. It's easy to replace it with a paperclip: Take the old battery out and insert the new one (refer to your owner's manual to determine which kind of battery you need), and clip it back in the correct position.
Keys
Lexus keys are not easy to replace and require a specialist locksmith for replacing car keys to make a working spare. This is because each Lexus key is equipped with an electronic chip that needs to be programmed to synchronise with the immobiliser of your vehicle If it is not, the car will not be able to start.
It requires a lot time and special equipment for this procedure to be completed correctly. Each model has its own procedure for programming. Replacing a remote or key fob is a costly job and one you should leave to professionals unless you have the appropriate tools and expertise.
You'll need to replace the batteries in your smart key or standard key. Both keys work by turning the barrel of the ignition. You can save money by doing this yourself, but you'll need the use of a small Phillips screwdriver, the coin (a 20p piece is a good choice) and a paperclip. On the back of the fob you will find one or two screws take them off and place them in a safe place (they're small and easily lost). Remove the fob to reveal an indentation that is circular for the metal key, pop the battery out (using the paperclip) and then insert the new one, making sure it is the right way up. Clip the the key back together.
Remotes
Replacing a Lexus remote or fob can be complicated and requires expert locksmiths with both the right tools and knowledge. Certain models require that the transponder chip in the key be reprogrammed in order to work with the car's immobiliser system. The chips are programmed with different methods depending on the model of Lexus. This is done by using a special device that sends a signal to the chip which matches the code used to unlock the doors and start the engine.
Some Lexus cars are equipped with a single unit which includes the key head and the remote. These are more simple to replace since there is no separate chip. This kind of key is also less expensive.
Regardless of the key type, all fobs eventually run out of battery power. It can be a frustrating experience however with a little bit of knowledge you can get your Lexus back to normal. Start by reading the owner's manual to determine what type of battery you need and find a replacement. Find small holes in the inside of the fob, and insert coins (a 20p piece works well) and twist. This should reveal the flat spot, which you can utilize a paperclip to remove.
Next, pop the old battery out and replace the new one. Make sure that you insert the battery with the proper orientation. Finally, cut the inside of the fob back and reconnect the key to the metal.
Transponder Chips
Nearly all new cars made since 1995 include transponder chips in the key head that allow it to deactivate the immobiliser system. lexus keys of a key that contains a transponder chip is able to be removed to reveal a metallic L-shaped key. Having a replacement key or fob made of transponder chips is a multi-stage process that involves precise cutting of replacement keys as well as programming the transponder chip to link up with the vehicle's immobiliser.
Transponders are chips that has Non-Volatile Memory. It is comprised of a set of windings, which are very fine wires that are wrapped around a tube. They resemble the ones in an electric motor. These windings create a coded message that the car will read. If the code is correct then the car will allow you to start it up.
There are two types of transponder chip. The first is called the 80-bit while the other is called the circle + (General Motors). The first one can be reused, but has to be unlocked using a special machine in order to work on a vehicle that is compatible with the. The latter is more difficult, as the older ones are often broken and then drilled through or thrown away when key cases are replaced. They can be salvaged, however, to use with the service key, which does not require a battery to operate.
Immobiliser Systems
An immobiliser system is a digital security device which prevents thieves from opening your car. It works by sending an electronic signal from your car to the key every time you attempt to start it. The electronic chip inside the key responds with a unique code which must match the one in the vehicle to start. If the codes don't match, the engine will shut down immediately, preventing theft of your car.
Modern smart keys and fobs are equipped with an embedded transponder that can store electronic security information in a format that can't be copied easily. When your fob or key is installed in the ignition it transmits this code to a receiver inside the ECU. The ECU then compares it to the code in its memory and then activates the ignition system and fuel circuit if they coincide. If the codes don't match, your engine won't start - even if an armed robber attempts to short-circuit the ignition circuit.
Replacing a fob or key is a multi-stage procedure that involves precise cutting of the new key blade and programming it to connect with your car's immobiliser system. There are many different immobilisers that are available in various years and models and each needs an individual programming procedure. We employ Ross-Tech to ensure that the replacement key is correctly programmed. This will give you maximum performance and security.