Lexus Key Replacement - Replacing a Remote Or Fob

The battery in your key fob will eventually wear out, regardless of whether you have a conventional Lexus Key that turns on the ignition, or an intelligent key for your vehicle, which starts by pressing the button. It's simple to replace it using a paperclip. Simply take out the old battery, then insert the new battery (refer to the owner's manual to determine the type of battery you need), then clip it back into its place.

Keys

Lexus keys aren't always easy to replace. A specialist locksmith is required to design a spare that works. This is because every Lexus key is equipped with an embedded microchip that must be programmed to work in conjunction with your vehicle's immobiliser 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 programming procedure. Replacing keys or remotes is a cost-effective service that you should leave to professionals, unless equipped with the right tools and knowledge.

If you have a traditional key that turns on the ignition barrel, or a smart key that starts the car with the click of a button they will both eventually need their batteries replaced. This can be done yourself however you'll need a small Phillips Screwdriver, 20p coin and paperclip. There are lost lexus keys or three screws on the back of the key fob. Unscrew them and store them safely (they are small and easy to lose). The fob is removed, revealing a circular indentation where the key's metal surface will be. Take the battery out with the help of a paperclip. Insert the new battery, ensuring that it's properly inserted. Then, you can clip the inside of the key back to the fob.

Remotes


Replacing a Lexus remote or fob can be complicated and requires skilled locksmiths with the right tools and expertise. Certain models require that the transponder chip within the key be reprogrammed to function with the car's immobiliser system. The Lexus models use different methods to program these chips. This is done by using a special device which transmits a code to the chip to unlock the doors or to start the engine.

Some Lexus vehicles are designed with a unit that combines the key head and remote. They are much easier to replace, since there is no chip that needs to be replaced. This kind of key is also less expensive.

All fobs eventually lose battery power, no matter the type of key. It can be very frustrating but with a little knowledge you can get your Lexus back to normal. The first step is to consult the owner's manual to determine what kind of battery you need and locate the replacement. Find a small opening on the inside of your fob. Insert a coin (20p works well) into the hole and twist. You should see a flat area that you can get rid of using an ordinary paperclip.

Then, remove the battery that was used and replace it with the new one. Make sure the new battery is inserted in the proper direction of operation. Clip the two sides of the fob together, then insert the key in the metal.

Transponder Chips

The majority of new cars since 1995 have transponder chips embedded in the key head to disarm the immobiliser system. The head of a key which has a transponder chip can be removed to reveal a steel L-shaped key. Making a replacement key, or fob made with a transponder chip is a multi-stage procedure that involves precise cutting of replacement keys and programming of the transponder chip so that it can synch up with the vehicle's immobiliser system.

A transponder is a chip that has Non-Volatile Memory. It has a set of windings, which are very fine wires wrapped around a tube. They look like the ones in an electric motor. These windings transmit a message that the car read. If the code is correct the car will start.

There are two kinds of transponder chips, one known as the 80 bit and the other is known as a circle + (General Motors). The first is reusable, but must be removed using a special machine in order to work on another compatible vehicle. The second kind is more difficult to use because the old keys can be damaged, drilled or toss out when keycases are changed. They can be salvaged however, to use with a service key that does not require a battery to operate.

Immobiliser Systems

An immobiliser is a digital security device that deters thieves from starting your vehicle. It operates by sending a signal from your vehicle to the key whenever you attempt to start it. The electronic chip inside the key responds with an unique code that must match that in the vehicle to start. If the codes do not match, the engine will shut down immediately and stop the theft of your car.

Modern smart keys and fobs have an embedded transponder chip that stores security information in a format that cannot be duplicated. When your fob or key is installed in the ignition it transmits this code to a receiver inside the ECU. The ECU analyzes this code in comparison to the one it has stored in its memory, and activates the fuel system and the ignition circuit if they are compatible. If the codes do not match, the engine will not start - even if a thief tries to short-circuit the ignition circuit.

Replacing a fob or key is a multi-stage process that involves precise cutting of the new blade of the key and programming it to connect with the immobiliser system of your vehicle. Every immobiliser system is unique and has its own unique programming procedure. We use Ross-Tech software to ensure that your replacement key is programmed correctly to ensure optimal performance and security.