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reprogramming Lexus Key fob Key Replacement - Replacing a Remote Or Fob

If you have a traditional Lexus key that switches on the ignition or a smart key for your car that starts with the press of one button, eventually the battery in the fob will deplete. Replacing it is as simple as a paperclip: Pop the old battery out and then insert the new one (refer to your owner's manual to determine which kind of battery you require), and clip it back into place.

Keys

Lexus keys are not easy to replace and require a specialist locksmith for car keys to create a spare working. This is because every Lexus key has an electronic chip that needs to be programmed to work in conjunction with the immobiliser system of your vehicle If it is not, the car will not start.

It takes a lot time and specialized equipment for this procedure to be completed correctly. Each model has its own programming procedure. Replacing a key or a remote fob is a costly job and one you should leave to professionals unless you have the right tools and know-how.

No matter if you're using a conventional key that rotates in the ignition barrel, or a smart key that will start the car at the touch of a button either way, they will need their batteries replaced. You can save money by doing this yourself, but it will require a small Phillips screwdriver and a coin (a 20p piece works well) and a paperclip. On the back of the fob you will see two or three screws take them off and place them somewhere safe (they're small and can be lost). Take the fob off to reveal an indentation with a circular shape that houses the key made of metal. Pop the battery out (using the paperclip) and insert the new one, making sure it is the right way up. Then, you can clip the inside of the key back together.

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 contained in the key be programmed to function with the car's immobiliser system. These chips are programmed by different methods depending on the model of Lexus. This is done using a specific device that sends an indication to the chip that is compatible with the code used to unlock the doors and start the engine.

Some Lexus vehicles are designed with a system that combines the key head and remote. These are easier to replace, as there is no separate chip required. This type of key can also be a little cheaper.

No matter what type of key any fob eventually runs out of battery power. This can be a frustrating situation, but it's possible to get your lexus ls400 key replacement back on track with a little know-how. Read the owner's guide to determine what type of battery you require. Then, find an alternative. Locate a small hole on the inside of the fob. Insert the coin (20p works well) into the hole and then twist. The fob should be revealed as a flat area that you can use a paper clip to remove.

Then, remove the battery that was used and replace it with the new one. Make sure you insert the battery in the correct orientation. Finally, you can clip the inside of the fob back and insert the key back into the metal.

Transponder Chips

Transponder chips are present in the key heads of a majority of new cars produced since 1995. They can be used to disable immobiliser systems. The head of a key that contains a transponder chip is able to be removed to reveal a metal L-shaped key. Having a replacement key or fob that is made using a transponder chip is a multi-stage procedure that includes precise cutting of the replacement keys and programming of the transponder chip to link up with the vehicle's immobiliser.

Transponders are chips with Non-Volatile Memory. It is comprised of a set of windings that are fine wires that are wrapped around a tube. They look like the ones in an electric motor. The windings create a coded signal that the car can read. If the code is correct the car will begin to move.

There are two kinds of transponder chip, one called the 80 bit and the other known as a circle + (General Motors). The first kind is reusable, however it needs to be unlocked using a special machine to function on another compatible vehicle. The second kind is more difficult to use as the older ones could be damaged, drilled or toss out when keycases are changed. However they can be used with a service-key which doesn't require a battery.

Immobiliser Systems

Immobiliser systems are electronic security devices that deter thieves from starting your vehicle. It operates by sending a signal from the vehicle to the key whenever you attempt to start it. The electronic chip in the key responds by sending a unique number of codes that must match the one of the vehicle to allow it to start. If the codes don't match, the engine will shut down immediately and prevent theft of your vehicle.

Modern smart keys and fobs are equipped with an embedded transponder that can store electronic security information in a format which is not easily copied. When the fob or key is inserted into the ignition, they transmit this code to the ECU. The ECU will then check it against the code stored in its memory, and activates the ignition and fuel system circuit if the two coincide. If the codes don't match then the engine will not start even when the ignition circuit is short-circuited by a thief.

Replacing a lost or damaged key is a multi-stage process that involves precise cutting of the new blade of the key and programming it to synch with the immobiliser system of your vehicle. There are many different immobiliser systems that are used in different models and years, and each requires the use of a unique programming method. We use Ross-Tech to ensure that the replacement key is programmed correctly. This will provide you with the highest level of performance and security.