Lexus Key Replacement - Replacing a Remote Or Fob

If you have a traditional lexus car key (click for info) key that is used to turn on the ignition, or a smart key for your car that activates with the push of a button, in time the battery in your fob will die. It is easy to replace it using an ordinary paperclip. Simply take out the old battery, replace it with the new one (refer to the owner's manual to determine the type of battery you require) and then secure it back into place.

Keys

Lexus keys aren't always easy to replace. A professional locksmith is needed to make an alternative that functions. Every Lexus key comes with a microchip which must be programmed in order to sync with the immobiliser system of your vehicle.

This procedure takes time and specialized equipment to complete right, and each model has its own method of programming. Replacing a key or remote fob is an expensive service and should be left to professionals unless you possess the proper tools and knowledge.

You will have to replace the batteries in your smart key or standard key. Both keys work by turning the barrel of the ignition. You can save money by doing this yourself, but it requires the use of a small Phillips screwdriver and coins (a 20p piece works well) and a paperclip. On the back of the fob you will see either two or three screws, unscrew them and put them somewhere safe (they're small and can be lost). Remove the fob, revealing an indentation of a circular shape where the metal key will be. The battery can be removed using the paperclip and insert the new battery, ensuring that it's inserted correctly. Then, clip the outside of the key back to the fob.

Remotes

lexus key fob replacement remotes and fobs can be difficult to replace and require locksmiths who are both skilled and possess the appropriate tools. Some models require the transponder inside the key to be changed so that it can work with the immobiliser of the vehicle. These chips are programmed using different methods based on the model of Lexus. This is accomplished by using an instrument 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 equipped with a key head that is a combination of the key head and remote. They are much easier to replace, since there is no separate chip needed. This type of key can also be a bit cheaper.

Whatever the type of key any fob eventually runs out of battery power. It can be very frustrating however with a little know-how you can get your Lexus back in operation. First, check the owner's manual to determine what type of battery you need and find the replacement. Find a small hole on the inside of the fob. Insert an amount of money (20p works well) into the hole and twist. You should be able to see an area flat that you can take out with the help of a paperclip.

Then, take the old battery out and replace the new one. Be sure the replacement battery is in the proper polarity. Then, clip the outside of the fob back together and insert the key back into the metal.

Transponder Chips

Nearly all new cars made since 1995 include transponder chips inside the head of the key to disable the immobiliser system. The head of a key that includes a transponder chips can be removed to reveal a metal L-shaped key. The process of getting a replacement key fob made of a transponder chip is a multi-stage process that includes accurate cutting of the replacement keys and programming the transponder chip so that it can synch up with the vehicle's immobiliser system.

A transponder is a type of chip that has Non-Volatile Memory. It contains a set windings which are delicate wires that are twisted around the tube. They look like the ones in an electric motor. The windings are coded to create a 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 chip, one known as the 80 bit, and the other known as a circle + (General Motors). The first is reusable, but it must be unlocked with a special machine to function on a different vehicle compatible with it. The second is more difficult to use as the old ones can be damaged, broken or thrown out when key cases are changed. They can be salvaged however for use with an ad-hoc key that doesn't need a battery to operate.

Immobiliser Systems

Immobiliser systems are electronic security measures that stop thieves from starting up your vehicle. It works by sending a signal from the vehicle to your key when you attempt to start it. The chip inside the key responds by transmitting a unique code that must match the one of the vehicle to allow it to start. If the codes don't coincide, your engine will shut down immediately to stop theft.

Modern smart keys and fobs have an embedded transponder that can store electronic security information in a format that cannot be easily copied. When the fob or key are inserted into the ignition, they transmit this code to the ECU. The ECU analyzes this code in comparison to the one stored in its memory and activates the fuel system and the ignition circuit if they match. If the codes don't match, your engine will not start - even if someone tries to short-circuit the ignition circuit.

The process of replacing the fob or key involves an entire process that involves cutting the new blade accurately and programming it to ensure that it syncs with your car's system. Every immobiliser system is unique and has its own programming procedure. We utilize Ross-Tech to ensure that the replacement key is programmed correctly. This will ensure the highest performance and security.