Lexus Key Replacement - Replacing a Remote Or Fob
If you have a traditional Lexus key that turns on the ignition, or a smart key for your car that begins with the press of one button, eventually the battery in the fob will deplete. Replacing it is easy with a paperclip: Pop the battery that is in use, insert the new one (refer to the manual for your owner to determine which kind of battery you require) and then secure it back in place.
Keys
Lexus keys aren't simple to replace and require a specialist locksmith to replace your car key to create a working spare. Every Lexus key has a microchip that needs to be programmed to connect with the immobiliser system of your vehicle.
This process requires time and requires special equipment to perform correctly, and every model has a distinct programming procedure. Replacing a key or a remote fob is an expensive service and should be left to professionals unless your have the appropriate tools and experience.
If you have a traditional key that turns on the ignition barrel or a smart key that will start the car at the push of the button they will both eventually need their batteries replaced. You can save money by doing this yourself, but it requires a small Phillips screwdriver and coins (a 20p piece works well) 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). Take the fob off, revealing a circular indentation where the metal key will be. Remove the battery using the paperclip and insert the new battery, making sure that it's properly inserted. Then, clip the outside of the key back to the fob.
Remotes
Lexus remotes and fobs aren't easy to replace and require locksmiths who are skilled and possess the appropriate tools. Some models require that the transponder chip within the key be changed to function with the vehicle's immobiliser system. The Lexus models use different methods to program these chips. This is done by using a special device which sends a code to the chip to unlock the doors or to start the engine.
replacement lexus key are constructed with a single unit which includes the key head as well as the remote. They are simpler to replace as no separate chip is required. This type of key is also less expensive.
No matter what type of key any fob eventually runs out of battery power. This can be a very frustrating experience, but it's possible to get your Lexus back on track with a little know-how. The first step is to consult the owner's manual to identify the type of battery you need and then locate an alternative. Find a small hole on the inside of the fob. Insert a coin (20p is a good choice) into the hole and twist. The fob should be revealed as a flat area that you can use a paper clip to take away.
Then, take out the battery that was used and replace it with the new one. Make sure that you insert the battery using the proper the polarity. Clip the inside of your fob to insert the metal key.
Transponder Chips
Most new cars made since 1995 include transponder chips embedded in the key head that allow it to deactivate the immobiliser system. If you've got a car key with a chip inside, the head is covered in a plastic cover that can be pulled off to reveal an L-shaped metal key. A transponder-chip replacement key, also known as a fob is a multi-stage process. It involves cutting the keys precisely and programming the chip to communicate with the vehicle immobiliser.
A transponder is a chip that has Non-Volatile Memory. It is comprised of a set of windings that are fine wires wrapped around a tube. They resemble the ones in an electric motor. The windings are coded to create a signal that the car can read. If the code is correct it will allow the car to start.
There are two types of transponder chips. The one is known as the 80-bit while the other is known as the circle + (General Motors). The first one is reusable, however it needs to be delocked using a specific machine to function on another compatible vehicle. The second type is more difficult to use as the older ones could be damaged, broken or taken away when key cases are changed. They are able to be salvaged however and used with the service key, which doesn't require batteries to function.
Immobiliser Systems
Immobiliser systems are electronic security measures which prevent thieves from starting your car. It works by sending a signal from your car to the key when you attempt to start it. The electronic chip in your key responds by sending an individual code that must match that of the vehicle to start. If the codes don't match, the engine will stop immediately and prevent theft of your vehicle.
Modern smart keys and fobs contain an embedded transponder, which stores electronic security information in a format that is not easily copied. When the key or fob is inserted into the ignition, they send this code to the ECU. The ECU then compares it with the code in its memory and activates the ignition and fuel system circuit if they match. If the codes don't match and the engine does not start even when the ignition circuit has been short-circuited by a thief.
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 works with your car's systems. Every immobiliser system is unique and has its own unique programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly for optimal performance and security.