Lexus Key Replacement - Replacing a Remote Or Fob
The battery in your key fob will eventually go out, regardless of whether you have a conventional Lexus Key that turns the ignition or an intelligent key for your vehicle that can start by pressing the button. It is simple to replace it using an ordinary paperclip. Simply remove the old battery, insert the new one (refer to the owner's manual to determine the type of battery that you require) and then clip it back in its place.
Keys
Lexus keys are not easy to replace and require a specialist locksmith for replacing car keys to make a functioning spare. This is due to the fact that every Lexus key contains an embedded microchip that must be programmed in order to synchronise with your vehicle's immobiliser system in case it does not. If it doesn't, the vehicle will not be able to start.
This process requires time and requires special equipment to perform correctly, and every model has its own programing procedure. Replacing remotes or keys is a costly task that you should leave to professionals, unless you are equipped with the right tools and knowledge.
If you have a traditional key that turns in the ignition barrel, or a smart key that can start your car at the click of a button they will both eventually need their batteries replaced. It's easy to do it yourself but you'll need an inexpensive Phillips Screwdriver, a coin worth 20p and paperclip. You will find one or two screws on the back of the fob for the key. Unscrew them and keep them safe (they are small and easy to lose). Take the fob off, revealing an indentation of a circular shape where the key's metal part will be. Remove the battery with the help of a paperclip. Insert the new battery, ensuring that it is inserted correctly. Then, clip the inside of the key back to the fob.
Remotes
Replacing the Lexus remote or fob can be an extremely complex process that requires skilled locksmiths equipped with the right tools and experience. Some models require the transponder in the key to be reprogrammed in order to function with the immobiliser system of the car. These chips are programmed by different methods depending on the model of Lexus. This is done with a specific device that sends a signal to the chip that 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. They are easier to replace since no separate chip is required. This type of key is also a bit cheaper.
Whatever the type of key regardless of the type of key, all fobs eventually run out of battery power. It can be quite frustrating but with a bit of knowledge you can get your Lexus back to normal. Refer to the owner's manual to determine what type of battery you need. Then, locate the replacement. Find an opening inside of the fob. Then, insert the coin (a 20p piece is a good choice) and twist. You should see an open area that you can get rid of using a paperclip.
Then, take out the battery that was used and replace it with the new one. Make sure to insert the battery using the proper direction of operation. Clip the inside of your fob together and insert the key made of metal.
Transponder Chips
Transponder chips are present in the key heads of a majority of new cars manufactured since 1995. They can be used to disarm immobiliser systems. If you have a key with a chip, the head is covered in a plastic cover that can be pulled off to reveal an L-shaped key. Having a replacement key or fob made of a transponder chip is a multi-stage process that includes precise cutting of the replacement keys and programming of the transponder chip to link up with the vehicle's immobiliser.
Transponders are electronic chip with Non-Volatile Memory (NVM) that houses a set of windings (very fine wire coiled around a tube) that resemble ones found in an electric motor. These windings transmit a message that the car read. If the code is correct, then the car will allow you to start it up.
There are two types of transponder chips, one known as the 80 bit, and the other is known as a circle + (General Motors). The first type can be reused, but has to be removed using a special machine to function on a different vehicle compatible with it. The latter is more difficult, as the older ones are often broken and drilled or thrown away when key cases are replaced. They can be salvaged however, to use with the service key, which doesn't need a battery to function.
Immobiliser Systems
An immobiliser system is an electronic security measure which prevents thieves from opening your car. It works by sending a signal from the vehicle to the key whenever you attempt to start it. The electronic chip in your key responds with an individual code that must match the one in the vehicle to start. If the codes do not coincide, your engine will shut down immediately to prevent theft.
Modern smart keys and fobs are equipped with an embedded transponder that stores electronic security information in a format that cannot be easily copied. When the key or fob are placed in the ignition, they send this code to the ECU. The ECU is then able to compare it with the code stored in its memory and then activates the fuel system and ignition circuit if they match. If the codes do not match the engine won't start, even when the ignition circuit is short-circuited by a thief.
Replacing lexus car keys The Keylab lost or damaged key is a multi-stage procedure that requires precise cutting of the new blade of the key and programming it to connect with your car's immobiliser system. There are a variety of immobiliser systems used in different years and models, and each requires the use of a unique programming method. We use Ross-Tech software to ensure that your replacement key is programmed correctly to ensure maximum performance and security.