Lexus Key Replacement - Replacing a Remote Or Fob
The battery inside your key fob will eventually go out, whether you own an ordinary Lexus Key that switches the ignition, or an intelligent key for your vehicle that can start by pressing the button. The replacement process is simple with using a paperclip. Pop the existing battery out and insert the new one (refer to the manual for your owner to determine which kind of battery you need), and clip it back in place.
Keys
Lexus keys aren't easy to replace and require a professional locksmith to replace your car key to create a working spare. Each Lexus key has a microchip that needs to be programmed in order to connect with the immobiliser system in your vehicle.
replacement lexus key takes time and special equipment to execute correctly, and every model has a different programing procedure. Replacing keys or remotes is a cost-effective service that should be left to professionals, unless you are equipped with the right tools and knowledge.
You'll have to replace the batteries in your smart key or conventional key. Both keys work by turning the barrel of the ignition. You can save money by doing this yourself, but it will require an inexpensive Phillips screwdriver and coins (a 20p piece works well) and a paperclip. There are two or three screws on the back of the fob for the key. Unscrew them, and store them securely (they are small and easy to lose). The fob can be removed to reveal an indentation with a circular shape that houses the metal key, pop the battery out (using the paperclip) and insert the new battery, making sure that it's pointing the right way up. Then, clip the inside of the key back together.
Remotes
Replacing the Lexus remote or fob can be a complicated process and requires skilled locksmiths who have the right tools and experience. Some models require that the chip inside the key be programmed to function with the immobiliser system of the car. The Lexus models use different methods to program these chips. This is done using a special device which transmits a specific code to the chip to unlock the doors or to start the engine.
Certain Lexus cars are designed with a single piece of hardware which includes the key head as well as the remote, and these are simpler to replace as there is no separate chip. This type of key is also a bit cheaper.
No matter what type of key any fob eventually runs out of battery power. It can be very frustrating however, with a little knowledge you can get your Lexus back to normal. Refer to the owner's manual to determine which battery type you need. Then, locate an alternative. Find a small opening on the inside of the fob. Insert a coin (20p works well) into the hole and twist. This should reveal a flat spot that you can make use of a paper clip to take away.
Next, pop the old battery off and insert the new one. Make sure to insert the battery with the correct direction of operation. Clip the two sides of your fob together and insert the key in the metal.
Transponder Chips
Transponder chips are present in the head of the key on almost all new vehicles manufactured after 1995. They are used to disarm immobiliser systems. If you've got a car key with a chip, the head comes with a cover that can be pulled off to reveal an L-shaped key. A replacement key or fob made of transponder chips is a multi-stage procedure that includes precise cutting of replacement keys and programming of the transponder chip in order to synch up with the vehicle's immobiliser system.
A transponder is an electronic chip with Non-Volatile Memory (NVM) which contains a set of windings (very fine wire that is wrapped around the tube) that look like the ones found in an electric motor. The windings generate a coded message that the car will read. If the code is correct the car will begin to move.
There are two kinds of transponder chips. One is known as the 80 bit and the other is known as a circle + (General Motors). The first type is reusable, however it needs to be delocked using a specific machine in order to work on a different vehicle compatible with it. The latter is more difficult since the earlier keys are often damaged or drilled through, or discarded after key cases are replaced. However, they can be used with a key-service that does not require a battery.
Immobiliser Systems
Immobiliser systems are electronic security devices that stop thieves from starting your vehicle. It operates by sending an electronic signal from your car to the key every time you attempt to start it. The electronic chip inside your key responds by sending a unique code that must match that of the vehicle in order to start. If the codes do not coincide, your engine will shut off immediately to prevent theft.
Modern smart keys and fobs feature embedded transponder chips that stores security information in a format that can't be easily duplicated. When the key or fob is inserted into the ignition, they transmit this code to the ECU. The ECU is able to compare this code with the one that is stored in its memory, and activates both the fuel system as well as the ignition circuit if they are compatible. If the codes do not match, the engine will not start - even if a burglar tries to short-circuit the ignition circuit.
The replacement of a key or fob involves an entire process that involves cutting the new key blade accurately and programming it so that it is compatible with your car's security system. Each immobiliser system is distinct and has its own programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly for maximum performance and security.