Lexus Key Replacement - Replacing a Remote Or Fob
If you own a traditional Lexus key that turns in the ignition or a smart key for your car that begins by pressing one button, eventually the battery inside your fob will die. It's easy to replace it with a paperclip: Take the battery that is in use and insert the new one (refer to the owner's manual to determine the type of battery you need) and then clip it back in the correct position.
Keys
Lexus keys aren't always easy to replace. A professional locksmith is required to design an original replacement that works. Every Lexus key comes with an embedded microchip, which needs to be programmed to connect with the immobiliser system of your vehicle.
It takes a lot of time and specialized equipment to allow this procedure to be completed correctly. Each model has its own specific programming process. Replacing keys or remotes is a costly service that you should leave to professionals, unless you are equipped with the proper equipment and know-how.
No matter if you're using a conventional key that is turned on in the ignition barrel, or a smart key that starts the car at the touch of one button, both will eventually need their batteries replaced. You can save money by doing it yourself but it will require a small Phillips screwdriver, the coin (a 20p piece is ideal) and a paperclip. There are two or three screws on the back of the key fob. Unscrew them, and store them securely (they are small and easy to lose). Take the fob off, revealing an indentation of a circular shape where the key's metal surface will be. Remove the battery with the help of a paperclip. Insert the new battery, ensuring that it's properly inserted. Clip the inside of the key to secure it.
Remotes
Replacing the Lexus remote or fob can be an extremely complex process that requires skilled locksmiths with the right tools as well as knowledge. Some models require that the transponder chip within the key be changed in order to work with the car's immobiliser system. 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 matches the code used to open the doors and start the engine.
Certain Lexus vehicles are designed with a device that combines the key head and remote. They are easy to replace since there is no separate chip needed. This kind of key could also be a little less expensive.
All fobs eventually lose battery power, regardless of the kind of key. It can be frustrating but with a little bit of knowledge you can get your Lexus up and running. Refer to the owner's manual to determine which type of battery you need. Then, locate an alternative. Then, find a small hole in the inside of the fob and insert an item of currency (a 20p piece works best) and twist. You should see a flat surface that you can get rid of using an ordinary paperclip.
Next, pop the old battery away and then insert the new one. Make sure that you insert the battery with the correct orientation. Clip the two sides of your fob together and insert the key in the metal.
Transponder Chips
More or less all new cars since 1995 have transponder chips inside the head of the key to disable the immobiliser system. The head of a key that has a transponder chip can be removed to reveal a steel L-shaped key. Making a replacement key, or fob with a transponder chip is a multi-stage procedure that involves precise cutting of replacement keys as well as programming the transponder chip so that it can synch up with the vehicle's immobiliser.
A transponder is an electronic chip that has Non-Volatile Memory (NVM) which contains a set of windings (very fine wire coiled around tubes) which look similar to ones in an electric motor. The windings are coded to create a signal for the car to read. If the code is correct the car will begin to move.
There are two types of transponder chip, the first is called the 80-bit, while the second is known as the circle + (General Motors). lexus replacement key programming is reusable, but it must be delocked using a specific machine to function on a different vehicle compatible with it. The second type is more difficult to use due to the fact that the older keys could be broken, drilled, or thrown out when key cases are changed. They are able to be salvaged however and then used to create an ad-hoc key that doesn't require a battery in order to operate.
Immobiliser Systems
Immobiliser systems are electronic security devices which prevent 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 that of the vehicle to allow it to start. If the codes aren't compatible, the engine will shut down immediately, and stop theft of your vehicle.
Modern smart keys and fobs contain an embedded transponder, which stores electronic security information in a format which cannot be easily copied. When the key or fob are placed in the ignition, they send this code to the ECU. The ECU compares this code with the one 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, the engine will not start, even when the ignition circuit is short-circuited by a thief.
The process of replacing the fob or key requires a multi-stage procedure that includes cutting the new key blade precisely and programming it so that it syncs with the car's system. There are many different immobiliser systems that are used in different models and years, and each requires an individual programming procedure. We use Ross-Tech software to ensure that your replacement key is programmed correctly for optimum performance and maximum security.