Lexus Key Replacement - Replacing a Remote Or Fob

Whether you have a conventional Lexus key that switches on the ignition, or a smart key for your car that starts with the push of one button, eventually the battery inside your fob will die. It's simple to replace it using an ordinary paperclip. Simply take out the old battery, then insert the new battery (refer to the owner's manual for the type of battery that you need) and then clip it back in the appropriate spot.

Keys

Lexus keys aren't simple to replace and require a professional locksmith for replacing car keys to create a spare working. This is because each 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 start.

The process takes time and special equipment to execute properly, and each model has a different procedure for programming. Replacing a key or remote fob can be a costly task and should be left to professionals unless your have the proper tools and knowledge.

You'll need to replace the batteries in your smart or conventional key. Both keys operate by turning the barrel of the ignition. You can save money by doing it yourself, but it requires a small Phillips screwdriver as well as the coin (a 20p piece is ideal) and a paperclip. You will find one or two screws on the back of the fob for the key. Unscrew them, and then store them in a safe place (they are small and easy to lose). Remove the fob and you will see an indentation that is circular for the key made from metal, take the battery out (using the paperclip) and insert the new lexus key battery, making sure that it's pointing the right way up. Then, clip the inside of the key back to the fob.

Remotes

Replacing a Lexus remote or fob can be complicated and requires expert locksmiths with both the right tools as well as knowledge. Some models require the transponder in the key to be programmed to allow it to communicate with the immobiliser system in the car. The Lexus models employ different methods to program these chips. This is done by using a special device that sends a signal to the chip that matches the code used to unlock the doors and start the engine.

Certain lost lexus key fob cars are equipped with a single unit that consists of the key head and remote, and these are more simple to replace since there is no separate chip. This kind of key could also be a bit less expensive.

Whatever the type of key any fob eventually runs out of battery power. This could be a difficult situation, but it's possible to get your Lexus back on track with a little bit of knowledge. First, consult the owner's guide to determine the kind of battery you require and then locate the replacement. Find a small opening on the inside of the fob. Insert the coin (20p is a good choice) into the hole and then twist. You should be able to see an area flat that you can get rid of using the help of a paperclip.

Then, take out the battery that was used and replace it with the new one. Be sure the replacement battery is installed with the proper polarity. Clip the inside of your fob together and insert the key made of metal.

Transponder Chips

The majority of new cars built since 1995 have transponder chips 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 metallic L-shaped key. A transponder chip replacement key or fob is a multi-stage procedure. It involves cutting the keys with precision and programming the chip to connect with the vehicle's immobiliser.

A transponder is a type of chip that has Non-Volatile Memory. It is comprised of a set of windings which are fine wires wrapped around a tube. They look similar to those in an electric motor. The windings create a coded signal that the car can read. If the code is correct then the car will allow you to start it.

There are two types of transponder chips, cheapest the one is known as the 80-bit, while the second is known as the circle + (General Motors). The former is reusable but needs to be unlocked by a special machine to function in a compatible vehicle. The latter one is more difficult since the earlier keys are usually broken, drilled through or discarded when key cases are replaced. However, they can be used with a service-key that does not require a battery.

Immobiliser Systems

An immobiliser is an electronic security measure that prevents thieves from starting your vehicle. It operates by sending an electronic signal from the vehicle to the key every time you attempt to start it. The electronic chip in your key responds by sending a unique code which must match that in the vehicle to start. If the codes aren't compatible, the engine will stop immediately, preventing theft of your car.

Modern smart keys and fobs have an embedded transponder which stores electronic security information in a format that can't be copied easily. When your key or fob is installed in the ignition it transmits the code to a receiver inside the ECU. The ECU compares this code with the one it has 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 and the engine does not start, even if the ignition circuit is short-circuited by a thief.

The procedure of replacing keys or fobs involves a multi-stage procedure that includes cutting the new blade precisely and programming it to ensure that it is compatible with your car's systems. Each immobiliser system is distinct and has its own unique programming procedure. We use Ross-Tech to ensure that the replacement key is correctly programmed. This will provide you with the best performance and security.