Lexus Key Replacement - Replacing a Remote Or Fob

The battery inside the key fob will eventually run out, regardless of whether it's the standard Lexus Key that switches the ignition, or an intelligent key for your vehicle that starts by pressing a button. It's simple to replace it with the use of a paperclip. Simply take out the old battery, insert the new one (refer to the owner's manual for the type of battery that you require) and then secure it back in the appropriate spot.

Keys

Lexus keys aren't simple to replace and require a specialist locksmith to replace your car key to make a working spare. This is because every Lexus key contains a microchip that needs to be programmed to work in conjunction with the immobiliser of your vehicle - if not it will not start.

It takes a lot time and special equipment for this procedure to be completed correctly. Each model has its own procedure for programming. Replacing keys or remotes is a costly service that should be left to professionals unless you are equipped with the right equipment and know-how.

You'll need to replace the batteries in your smart key or traditional key. Both keys work by turning the barrel of the ignition. This can be done yourself but you'll need the smallest Phillips Screwdriver, a coin worth 20p and a paperclip. On the back of the fob you will see two or three screws remove them and place them somewhere safe (they're small and easily lost). Remove the fob to reveal an indentation of circular shape for the metal key, pop the battery out (using the paperclip) and then insert the new lexus key one ensuring that it's pointing the right way up. Clip the inside of the key to secure it.

Remotes

Replacing the Lexus remote or fob can be a complicated process and requires skilled locksmiths who have the right tools and experience. Certain models require the transponder inside the key to be changed so that it can work with the immobiliser systems of the car. These chips are programmed using different methods based on the model of Lexus. This is accomplished by using a special device that sends an electrical signal to the chip that is compatible with the code used to open the doors and start the engine.

Certain Lexus cars are designed with a unit that combines the key head and the remote. They are easy to replace, since there is no separate chip required. This kind of key could also be a bit less expensive.

All fobs eventually lose their battery power, regardless of the type of key. This could be a difficult experience, but it is possible to get your Lexus back up and running with a little knowledge. The first step is to consult the owner's manual to identify the type of battery you need and find the replacement. Find small holes in the inside of the fob and insert an item of currency (a 20p piece works well) and twist. You should be able to see a flat area that you can remove with the help of a paperclip.

Then, take out the battery that was used and replace it with the new one. Make sure that the replacement battery is in the proper the polarity. Clip the two sides of your fob together and insert the key in the metal.

Transponder Chips

Transponder chips are present in the key heads of almost all new cars manufactured since 1995. They are used to disarm immobiliser systems. If you've got keys with a chip in it the head has a plastic cover that can be taken off to reveal an L-shaped key. Having a replacement key or fob with transponder chips is a multi-stage process which includes precise cutting of key replacements and programming the transponder chip to link up with the vehicle's immobiliser system.

Transponders are electronic device with Non-Volatile Memory (NVM) that houses a set of windings (very fine wire that is wrapped around a tube) that look like the ones in an electric motor. These windings generate a signal that the car can read. If the code is correct, then the car will allow you to start it.

There are two kinds of transponder chip, the first is called the 80-bit while the other is known as the circle + (General Motors). The former can be reused but must be delocked by a specific machine in order to function in a different compatible vehicle. The second one is more difficult to use since the older ones could be damaged, broken or removed when key cases are changed. However they can be used with a service-key which does not require a battery.

Immobiliser Systems

An immobiliser is an electronic security feature that stops thieves from starting your vehicle. It works by sending a signal from the car to the key when you attempt to start it. The chip inside the key responds by sending a unique code which must match that of the vehicle to allow it to start. If the codes don't match, the engine will stop immediately and prevent theft of your vehicle.

Modern smart keys and fobs come with embedded transponder chips that stores security information in a format that can't be easily duplicated. When your fob or key is put into the ignition, it transmits this code to a receiver within the ECU. The ECU is then able to compare it with the code 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 in the event that the ignition circuit is cut off by a criminal.

Replacing a key or fob is a multi-stage procedure which involves precise cutting the new lexus key key blade, and programming it to work with your car's immobiliser system. There are a variety of immobiliser systems that are used in different years and models and each one requires its own unique programming procedure. We utilize Ross-Tech to ensure that the replacement key is correctly programmed. This will give you the highest level of performance and security.